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  <rr:ObjectiveHeading contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;INVESTMENT OBJECTIVE &lt;/b&gt;&lt;/font&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund seeks total return consisting of a combination of income and capital appreciation. &lt;/font&gt;</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. &lt;/font&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:ProspectusDate contextRef="Duration_01Aug2011_31Jul2012">2012-07-31</rr:ProspectusDate>
  <rr:ExpenseHeading contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FEES AND EXPENSES OF THE FUND&lt;/b&gt;&lt;/font&gt;</rr:ExpenseHeading>
  <dei:DocumentType contextRef="Duration_01Aug2011_31Jul2012">485BPOS</dei:DocumentType>
  <dei:EntityRegistrantName contextRef="Duration_01Aug2011_31Jul2012">NORTHERN FUNDS</dei:EntityRegistrantName>
  <rr:ShareholderFeesCaption contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Shareholder Fees&lt;/b&gt; (fees paid directly from your investment)&lt;/font&gt;</rr:ShareholderFeesCaption>
  <dei:DocumentPeriodEndDate contextRef="Duration_01Aug2011_31Jul2012">2012-03-31</dei:DocumentPeriodEndDate>
  <dei:EntityCentralIndexKey contextRef="Duration_01Aug2011_31Jul2012">0000916620</dei:EntityCentralIndexKey>
  <dei:DocumentCreationDate contextRef="Duration_01Aug2011_31Jul2012">2012-07-23</dei:DocumentCreationDate>
  <dei:DocumentEffectiveDate contextRef="Duration_01Aug2011_31Jul2012">2012-07-31</dei:DocumentEffectiveDate>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <dei:AmendmentFlag contextRef="Duration_01Aug2011_31Jul2012">false</dei:AmendmentFlag>
  <rr:RiskReturnHeading contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER SMALL CAP FUND&lt;/b&gt;&lt;/font&gt;</rr:RiskReturnHeading>
  <rr:RiskReturnHeading contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER INTERNATIONAL EQUITY FUND&lt;/b&gt;&lt;/font&gt;</rr:RiskReturnHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. &lt;/font&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">-0.02</rr:RedemptionFeeOverRedemption>
  <rr:RiskReturnHeading contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER LARGE CAP FUND&lt;/b&gt;&lt;/font&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;INVESTMENT OBJECTIVE &lt;/b&gt;&lt;/font&gt;</rr:ObjectiveHeading>
  <rr:ExpenseHeading contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FEES AND EXPENSES OF THE FUND&lt;/b&gt;&lt;/font&gt;</rr:ExpenseHeading>
  <rr:ObjectiveHeading contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;INVESTMENT OBJECTIVE &lt;/b&gt;&lt;/font&gt;</rr:ObjectiveHeading>
  <rr:OperatingExpensesCaption contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Annual Fund Operating Expenses&lt;/b&gt; (expenses that you pay each year as a&lt;br/&gt;percentage of the value of your investment)&lt;/font&gt;</rr:OperatingExpensesCaption>
  <rr:ShareholderFeesCaption contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Shareholder Fees&lt;/b&gt; (fees paid directly from your investment)&lt;/font&gt;</rr:ShareholderFeesCaption>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.008</rr:ManagementFeesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.0037</rr:OtherExpensesOverAssets>
  <rr:Component1OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.0015</rr:Component1OtherExpensesOverAssets>
  <rr:Component2OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.001</rr:Component2OtherExpensesOverAssets>
  <rr:Component3OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.0012</rr:Component3OtherExpensesOverAssets>
  <rr:ShareholderFeeOther decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="USD">0</rr:ShareholderFeeOther>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.0117</rr:ExpensesOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_2" decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">-0.0017</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.01</rr:NetExpensesOverAssets>
  <rr:ExpenseExampleHeading contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;EXAMPLE &lt;/b&gt;&lt;/font&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PORTFOLIO TURNOVER.&lt;/b&gt;&lt;/font&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyHeading contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL INVESTMENT STRATEGIES&lt;/b&gt;&lt;/font&gt;</rr:StrategyHeading>
  <rr:BarChartHeading contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;CALENDAR YEAR TOTAL RETURN*&lt;/b&gt;&lt;/font&gt;</rr:BarChartHeading>
  <rr:PerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;AVERAGE ANNUAL TOTAL RETURN&lt;/b&gt;&lt;br/&gt;&lt;i&gt;(For the periods ended December 31, 2011)&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableHeading>
  <rr:ExpenseExampleHeading contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;EXAMPLE &lt;/b&gt;&lt;/font&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: &lt;/font&gt;</rr:ExpenseExampleNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL RISKS&lt;/b&gt;&lt;/font&gt;</rr:RiskHeading>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="USD">102</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="USD">355</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="USD">627</rr:ExpenseExampleYear05>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.011</rr:ManagementFeesOverAssets>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="USD">1405</rr:ExpenseExampleYear10>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.0031</rr:OtherExpensesOverAssets>
  <rr:Component1OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.0015</rr:Component1OtherExpensesOverAssets>
  <rr:PortfolioTurnoverHeading contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PORTFOLIO TURNOVER.&lt;/b&gt;&lt;/font&gt;</rr:PortfolioTurnoverHeading>
  <rr:Component2OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.001</rr:Component2OtherExpensesOverAssets>
  <rr:Component3OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.0006</rr:Component3OtherExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.0141</rr:ExpensesOverAssets>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_Member" unitRef="pure">0.8061</rr:PortfolioTurnoverRate>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_3" decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">-0.0011</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:StrategyHeading contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL INVESTMENT STRATEGIES&lt;/b&gt;&lt;/font&gt;</rr:StrategyHeading>
  <rr:ObjectiveHeading contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;INVESTMENT OBJECTIVE &lt;/b&gt;&lt;/font&gt;</rr:ObjectiveHeading>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.013</rr:NetExpensesOverAssets>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund seeks to provide long-term capital appreciation through a diversified portfolio of primarily larger market capitalization equity securities.&lt;/font&gt;</rr:ObjectivePrimaryTextBlock>
  <rr:ObjectiveSecondaryTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Income is the Fund&amp;#8217;s secondary objective. &lt;/font&gt;</rr:ObjectiveSecondaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FEES AND EXPENSES OF THE FUND&lt;/b&gt;&lt;/font&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. &lt;/font&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:ShareholderFeesCaption contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Shareholder Fees &lt;/b&gt;(fees paid directly from your investment)&lt;/font&gt;</rr:ShareholderFeesCaption>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund seeks to provide long-term capital appreciation through a diversified portfolio of primarily non-U.S. equity securities. Any income received is incidental to this objective.&lt;/font&gt;</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FEES AND EXPENSES OF THE FUND&lt;/b&gt;&lt;/font&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. &lt;/font&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER MID CAP FUND&lt;/b&gt;&lt;/font&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;INVESTMENT OBJECTIVE &lt;/b&gt;&lt;/font&gt;</rr:ObjectiveHeading>
  <rr:ExpenseHeading contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FEES AND EXPENSES OF THE FUND&lt;/b&gt;&lt;/font&gt;</rr:ExpenseHeading>
  <rr:ShareholderFeesCaption contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Shareholder Fees&lt;/b&gt; (fees paid directly from your investment)&lt;/font&gt;</rr:ShareholderFeesCaption>
  <rr:RiskReturnHeading contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER EMERGING MARKETS EQUITY FUND &lt;/b&gt;&lt;/font&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;INVESTMENT OBJECTIVE &lt;/b&gt;&lt;/font&gt;</rr:ObjectiveHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: &lt;/font&gt;</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="USD">132</rr:ExpenseExampleYear01>
  <rr:ShareholderFeesCaption contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Shareholder Fees&lt;/b&gt; (fees paid directly from your investment)&lt;/font&gt;</rr:ShareholderFeesCaption>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="USD">435</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="USD">761</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="USD">1681</rr:ExpenseExampleYear10>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:ShareholderFeeOther decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="USD">0</rr:ShareholderFeeOther>
  <rr:ShareholderFeeOther decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="USD">0</rr:ShareholderFeeOther>
  <rr:ExpenseHeading contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FEES AND EXPENSES OF THE FUND&lt;/b&gt;&lt;/font&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. &lt;/font&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;July 31, 2013&lt;/i&gt;&lt;/font&gt;</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <rr:OperatingExpensesCaption contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Annual Fund Operating Expenses&lt;/b&gt; (expenses that you pay each year as a&lt;br/&gt;percentage of the value of your investment)&lt;/font&gt;</rr:OperatingExpensesCaption>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_Member" unitRef="pure">0.5647</rr:PortfolioTurnoverRate>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">-0.02</rr:RedemptionFeeOverRedemption>
  <rr:RiskLoseMoney contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund.&lt;/b&gt; &lt;/font&gt;</rr:RiskLoseMoney>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.009</rr:ManagementFeesOverAssets>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;800-595-9111&lt;/font&gt;</rr:PerformanceAvailabilityPhone>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;www.northernfunds.com&lt;/font&gt;</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.0029</rr:OtherExpensesOverAssets>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.0104</rr:ManagementFeesOverAssets>
  <rr:Component1OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.0015</rr:Component1OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.0036</rr:OtherExpensesOverAssets>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">-0.02</rr:RedemptionFeeOverRedemption>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;</rr:PerformancePastDoesNotIndicateFuture>
  <rr:Component2OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.001</rr:Component2OtherExpensesOverAssets>
  <rr:Component1OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.0015</rr:Component1OtherExpensesOverAssets>
  <rr:Component2OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.001</rr:Component2OtherExpensesOverAssets>
  <rr:OperatingExpensesCaption contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Annual Fund Operating Expenses&lt;/b&gt; (expenses that you pay&lt;br/&gt; each year as a percentage of the value of your investment)&lt;/font&gt;</rr:OperatingExpensesCaption>
  <rr:Component3OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.0004</rr:Component3OtherExpensesOverAssets>
  <rr:Component3OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.0011</rr:Component3OtherExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.014</rr:ExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.0119</rr:ExpensesOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_4" decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">-0.0005</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.009</rr:ManagementFeesOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.0135</rr:NetExpensesOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_5" decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">-0.0009</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:ShareholderFeesCaption contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Shareholder Fees&lt;/b&gt; (fees paid directly from your investment)&lt;/font&gt;</rr:ShareholderFeesCaption>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.011</rr:NetExpensesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.003</rr:OtherExpensesOverAssets>
  <rr:OperatingExpensesCaption contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Annual Fund Operating Expenses&lt;/b&gt; (expenses that you pay each year as a percentage of the value of your investment)&lt;/font&gt;</rr:OperatingExpensesCaption>
  <rr:Component1OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.0015</rr:Component1OtherExpensesOverAssets>
  <rr:Component2OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.001</rr:Component2OtherExpensesOverAssets>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;In seeking to achieve its investment objective, the Fund will invest, under normal circumstances, at least 80% of its net assets in bonds and other fixed-income securities that are rated below investment grade (commonly referred to as &amp;#8220;junk bonds&amp;#8221;). These may include:&lt;/font&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Obligations of U.S. and foreign corporations and banks;&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Obligations of state, local and foreign governments;&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Senior and subordinated bonds and debentures;&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Mortgage and other asset-backed securities;&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Zero coupon, pay-in-kind and capital appreciation bonds;&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Convertible securities, preferred stock, structured securities and loan participations; and&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Warrants, rights and other equity securities that are acquired in connection with the Fund&amp;#8217;s investments in debt or convertible securities. &lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The sub-advisers may shift the Fund&amp;#8217;s assets among various types of securities based upon changing market conditions, yield differences and the credit-worthiness of issuers among other things.&lt;br/&gt;&lt;br/&gt;Lower quality securities are rated BB, Ba or lower by a Nationally Recognized Statistical Rating Organization (&amp;#8220;NRSRO&amp;#8221;). Unrated securities will be of comparable quality as determined by each sub-adviser. Lower rated securities tend to offer higher yields than higher rated securities with similar maturities. However, lower rated securities are considered speculative and generally involve greater price volatility and greater risk of loss than higher rated securities. There is no minimum rating for a security purchased or held by the Fund, and the Fund may purchase securities that are in default. Although the Fund invests primarily in lower quality fixed-income securities, it may invest a portion of its assets in securities of higher quality. The Fund does not have any portfolio maturity limitation, and may invest its assets from time to time primarily in instruments with short, medium or long maturities.&lt;br/&gt;&lt;br/&gt;Although the Fund primarily invests in the debt obligations of domestic issuers, it may invest in fixed-income securities of foreign issuers, including issuers located in emerging market countries. The Fund&amp;#8217;s investments in foreign issuers together with notional underlying foreign currency exposure are not expected to exceed 30%. &lt;br/&gt;&lt;br/&gt;The Fund utilizes a &amp;#8220;multi-manager&amp;#8221; approach whereby the Fund&amp;#8217;s assets are allocated to one or more sub-advisers, in percentages determined at the discretion of the Investment Advisers. Each sub-adviser acts independently from the others and utilizes its own distinct investment style in selecting securities. However, each sub-adviser must operate within the constraints of the Fund&amp;#8217;s investment objective, strategies and restrictions.&lt;br/&gt;&lt;br/&gt;When determining the allocations and reallocations to sub-advisers, the Investment Advisers will consider a variety of factors, including but not limited to the sub-adviser&amp;#8217;s investment approach, historical performance, and the characteristics of each sub-adviser&amp;#8217;s allocated assets (including duration, credit quality, average maturity, industry and geographic region). The Investment Advisers seek, through their selection of sub-advisers and their allocation determinations, to reduce portfolio volatility and provide an attractive combination of risk and return for the Fund.&lt;br/&gt;&lt;br/&gt;The sub-advisers may engage in active trading, and will not consider portfolio turnover a limiting factor in making decisions for the Fund. &lt;/font&gt;</rr:StrategyNarrativeTextBlock>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.0116</rr:ManagementFeesOverAssets>
  <rr:Component3OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.0005</rr:Component3OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.0036</rr:OtherExpensesOverAssets>
  <rr:Component1OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.0015</rr:Component1OtherExpensesOverAssets>
  <rr:Component2OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.001</rr:Component2OtherExpensesOverAssets>
  <rr:Component3OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.0011</rr:Component3OtherExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.012</rr:ExpensesOverAssets>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableUsesHighestFederalRate>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.0152</rr:ExpensesOverAssets>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_6" decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">-0.001</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.011</rr:NetExpensesOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_7" decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">-0.0012</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.014</rr:NetExpensesOverAssets>
  <rr:RiskHeading contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;&lt;b&gt;PRINCIPAL RISKS &lt;/b&gt;&lt;/font&gt;</rr:RiskHeading>
  <rr:RiskReturnHeading contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER GLOBAL REAL ESTATE FUND&lt;/b&gt;&lt;/font&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;INVESTMENT OBJECTIVE &lt;/b&gt;&lt;/font&gt;</rr:ObjectiveHeading>
  <rr:ExpenseHeading contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FEES AND EXPENSES OF THE FUND&lt;/b&gt;&lt;/font&gt;</rr:ExpenseHeading>
  <rr:ShareholderFeesCaption contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Shareholder Fees&lt;/b&gt; (fees paid directly from your investment)&lt;/font&gt;</rr:ShareholderFeesCaption>
  <rr:OperatingExpensesCaption contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Annual Fund Operating Expenses&lt;/b&gt; (expenses that you pay each year as a&lt;br/&gt;percentage of the value of your investment)&lt;/font&gt;</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;EXAMPLE &lt;/b&gt;&lt;/font&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PORTFOLIO TURNOVER.&lt;/b&gt;&lt;/font&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyHeading contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL INVESTMENT STRATEGIES&lt;/b&gt;&lt;/font&gt;</rr:StrategyHeading>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;July 31, 2013&lt;/i&gt;&lt;/font&gt;</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <rr:BarChartHeading contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;CALENDAR YEAR TOTAL RETURN*&lt;/b&gt;&lt;/font&gt;</rr:BarChartHeading>
  <rr:PerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;AVERAGE ANNUAL TOTAL RETURN&lt;/b&gt;&lt;br/&gt;&lt;i&gt;(For the periods ended December 31, 2011)&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableHeading>
  <rr:ExpenseExampleHeading contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;EXAMPLE &lt;/b&gt;&lt;/font&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: &lt;/font&gt;</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="USD">112</rr:ExpenseExampleYear01>
  <rr:RiskHeading contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL RISKS &lt;/b&gt;&lt;/font&gt;</rr:RiskHeading>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="USD">369</rr:ExpenseExampleYear03>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;July 31, 2013&lt;/i&gt;&lt;/font&gt;</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="USD">646</rr:ExpenseExampleYear05>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund seeks to provide long-term capital appreciation and current income through a diversified portfolio of primarily equity securities of U.S. and foreign real estate and real estate related companies. &lt;/font&gt;</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;EXAMPLE &lt;/b&gt;&lt;/font&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="USD">1435</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: &lt;/font&gt;</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. &lt;/font&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="USD">143</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="USD">469</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="USD">818</rr:ExpenseExampleYear05>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="USD">1802</rr:ExpenseExampleYear10>
  <rr:OperatingExpensesCaption contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Annual Fund Operating Expenses&lt;/b&gt; (expenses that you pay each year as a&lt;br/&gt;percentage of the value of your investment)&lt;/font&gt;</rr:OperatingExpensesCaption>
  <rr:PortfolioTurnoverHeading contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PORTFOLIO TURNOVER.&lt;/b&gt;&lt;/font&gt;</rr:PortfolioTurnoverHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MARKET RISK&lt;/b&gt; is the risk that the market values of fixed-income securities owned by the Funds may decline, at times sharply and unpredictably.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;MANAGEMENT RISK&lt;/b&gt; is the risk that a strategy used by the investment management team may fail to produce the intended results.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;MULTI-MANAGER RISK&lt;/b&gt; is the risk that the sub-advisers&amp;#8217; investment styles will not always be complementary, which could affect the performance of the Fund.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;LIQUIDITY RISK&lt;/b&gt; is the risk that certain portfolio securities may be less liquid than others, which may make them difficult or impossible to sell at the time and the price that the Fund would like, adversely affecting the value of the Fund&amp;#8217;s investments and its returns.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;INTEREST RATE/MATURITY RISK&lt;/b&gt; is the risk that the value of the Fund&amp;#8217;s assets will decline because of rising interest rates. The magnitude of this decline will often be greater for longer-term fixed-income securities than shorter-term fixed-income securities.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;PREPAYMENT (OR CALL) RISK&lt;/b&gt; is the risk that prepayment of the underlying mortgages or other collateral of some fixed-income securities may result in a decreased rate of return and a decline in value of those securities.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;DEBT EXTENSION RISK&lt;/b&gt; is the risk that an issuer will exercise its right to pay principal on an obligation held by the Fund (such as a mortgage-backed security) later than expected. This may happen during a period of rising interest rates. Under these circumstances, the value of the obligation will decrease and the Fund will suffer from the inability to invest in higher yielding securities.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;CREDIT (OR DEFAULT) RISK&lt;/b&gt; is the risk that the inability or unwillingness of an issuer or guarantor of a fixed-income security, or a counterparty to a repurchase or other transaction, to meet its payment or other financial obligations will adversely affect the value of the Fund&amp;#8217;s investments and its returns. Changes in the credit rating of a debt security held by the Fund could have a similar effect.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;HIGH-YIELD RISK&lt;/b&gt; is the risk that the Fund&amp;#8217;s non-investment grade fixed-income securities, sometimes known as &amp;#8220;junk bonds,&amp;#8221; will be subject to greater credit risk, price volatility and risk of loss than investment grade securities, which can adversely impact the Fund&amp;#8217;s return and net asset value ("NAV"). High yield securities are considered primarily speculative with respect to the issuer&amp;#8217;s continuing ability to make principal and interest payments.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;CURRENCY RISK&lt;/b&gt; is the risk that foreign currencies will fluctuate in value relative to the U.S. dollar, adversely affecting the value of the Fund&amp;#8217;s investments and its returns. Because the Fund&amp;#8217;s NAV is determined on the basis of U.S. dollars, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the market value of the Fund&amp;#8217;s holdings appreciates.&lt;br/&gt;&lt;br/&gt;&lt;b&gt; EMERGING MARKETS RISK&lt;/b&gt; is the risk that markets of emerging market countries are less developed and less liquid, subject to greater price volatility and generally subject to increased economic, political, regulatory and other uncertainties than more developed markets.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;PORTFOLIO TURNOVER RISK&lt;/b&gt; is the risk that high portfolio turnover is likely to lead to increased Fund expenses that may result in lower investment returns. High portfolio turnover also is likely to result in higher short-term capital gains taxable to shareholders. For the last fiscal year, the annual portfolio turnover rate of the Fund exceeded 100%.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;FOREIGN SECURITIES RISK&lt;/b&gt; is the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to less liquid markets, and adverse economic, political, diplomatic, financial, and regulatory factors. Foreign governments also may impose limits on investment and repatriation and impose taxes. Any of these events could cause the value of the Fund&amp;#8217;s investments to decline.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank.&lt;/b&gt;&lt;/font&gt;</rr:RiskNarrativeTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;EXAMPLE &lt;/b&gt;&lt;/font&gt;</rr:ExpenseExampleHeading>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.011</rr:ManagementFeesOverAssets>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: &lt;/font&gt;</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 46.58% of the average value of its portfolio.&lt;/font&gt;</rr:PortfolioTurnoverTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FUND PERFORMANCE&lt;/b&gt;&lt;/font&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:Component1OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.0015</rr:Component1OtherExpensesOverAssets>
  <rr:Component2OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.001</rr:Component2OtherExpensesOverAssets>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="USD">137</rr:ExpenseExampleYear01>
  <rr:StrategyHeading contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL INVESTMENT STRATEGIES&lt;/b&gt;&lt;/font&gt;</rr:StrategyHeading>
  <rr:ExpenseExampleHeading contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;EXAMPLE &lt;/b&gt;&lt;/font&gt;</rr:ExpenseExampleHeading>
  <rr:Component3OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.0012</rr:Component3OtherExpensesOverAssets>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="USD">438</rr:ExpenseExampleYear03>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.0147</rr:ExpensesOverAssets>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="USD">761</rr:ExpenseExampleYear05>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;In seeking long-term capital appreciation, the Fund will invest, under normal circumstances, at least 80% of its net assets in equity securities of small capitalization companies. Small capitalization companies generally are considered to be those whose market capitalization is, at the time the Fund makes an investment, generally within the range of the capitalization of companies in the Russell 2000&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt;&lt;/font&gt; Index or the S&amp;amp;P SmallCap 600&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt;&lt;/font&gt; Index. Securities of companies whose capitalization no longer meets this definition after purchase may continue to be considered securities of small capitalization companies and held in the Fund. As of May 31, 2012, the market capitalization of the companies in Russell 2000 Index was between $2.9 million and $4.2 billion. As of May 31, 2012, the market capitalization of the companies in the S&amp;amp;P SmallCap 600 Index was between $33.6 million and $3.1 billion. The sizes of companies in the Indices change with market conditions. In addition, changes to the composition of the Russell 2000 Index and the S&amp;amp;P SmallCap 600 Index can change the market capitalization ranges of the companies in the Indices. The Fund is not limited to the equity securities included in the Russell 2000 Index or the S&amp;amp;P SmallCap 600 Index and may invest in other equity securities that meet the sub-advisers&amp;#8217; criteria discussed below.&lt;br/&gt;&lt;br/&gt;While the Fund invests at least 80% of its net assets in equity securities of small capitalization companies, it may also invest up to 20% of its net assets in equity securities of companies that have market capitalizations that are higher or lower than the ranges of the Russell 2000 Index or the S&amp;amp;P SmallCap 600 Index.&lt;br/&gt;&lt;br/&gt;The Fund utilizes a &amp;#8220;multi-manager&amp;#8221; approach whereby the Fund&amp;#8217;s assets are allocated to one or more sub-advisers, at the discretion of the Investment Advisers. Each sub-adviser acts independently from the others and utilizes its own distinct investment style in selecting securities. However, each sub-adviser must operate within the constraints of the Fund&amp;#8217;s investment objective, strategies and restrictions. The Fund utilizes two principal styles intended to complement each other:&lt;/font&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Value style &lt;/i&gt;whereby the sub-advisers seek to identify companies whose improving businesses are not fully recognized by the market and whose securities are thus selling at valuations less than should be expected.&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Growth style &lt;/i&gt;whereby the sub-advisers seek to identify companies that are exhibiting rapid growth in their businesses.&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;When determining the allocations and reallocations to sub-advisers, the Investment Advisers will consider a variety of factors, including but not limited to the sub-adviser&amp;#8217;s style, historical performance, and the characteristics of each sub-adviser&amp;#8217;s allocated assets (including capitalization, growth and profitability measures, valuation metrics, economic sector exposures, and earnings and volatility statistics). The Investment Advisers seek, through their selection of sub-advisers and their allocation determinations, to reduce portfolio volatility and provide an attractive combination of risk and return for the Fund.&lt;br/&gt;&lt;br/&gt;The Fund may make significant investments in initial public offerings (&amp;#8220;IPOs&amp;#8221;).&lt;br/&gt;&lt;br/&gt;The sub-advisers may engage in active trading, and will not consider portfolio turnover a limiting factor in making decisions for the Fund.&lt;br/&gt;&lt;br/&gt;&lt;i&gt;Frank Russell Company does not endorse any of the securities in the Russell 2000 Index. Standard &amp;amp; Poor&amp;#8217;s Financial Services LLC does not endorse any of the securities in the S&amp;amp;P SmallCap 600. They are not sponsors of the Multi-Manager Small Cap Fund and are not affiliated with the Fund in any way. &lt;/i&gt;&lt;/font&gt;</rr:StrategyNarrativeTextBlock>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_8" decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">-0.0027</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="USD">1675</rr:ExpenseExampleYear10>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.012</rr:NetExpensesOverAssets>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 39.43% of the average value of its portfolio. &lt;/font&gt;</rr:PortfolioTurnoverTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PORTFOLIO TURNOVER.&lt;/b&gt;&lt;/font&gt;</rr:PortfolioTurnoverHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: &lt;/font&gt;</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index.&lt;br/&gt;&lt;br/&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;br/&gt;&lt;br/&gt;Updated performance information for the Fund is available and may be obtained on the Fund&amp;#8217;s Web site at www.northernfunds.com or by calling 800-595-9111. &lt;/font&gt;</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartHeading contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;CALENDAR YEAR TOTAL RETURN*&lt;/b&gt;&lt;/font&gt;</rr:BarChartHeading>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="USD">112</rr:ExpenseExampleYear01>
  <rr:PortfolioTurnoverHeading contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PORTFOLIO TURNOVER.&lt;/b&gt;&lt;/font&gt;</rr:PortfolioTurnoverHeading>
  <rr:PerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;AVERAGE ANNUAL TOTAL RETURN&lt;/b&gt;&lt;br/&gt;&lt;i&gt;(For the periods ended December 31, 2011)&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableHeading>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="USD">371</rr:ExpenseExampleYear03>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_Member" unitRef="pure">0.3943</rr:PortfolioTurnoverRate>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="USD">650</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="USD">1446</rr:ExpenseExampleYear10>
  <rr:StrategyHeading contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL INVESTMENT STRATEGIES&lt;/b&gt;&lt;/font&gt;</rr:StrategyHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 70.80% of the average value of its portfolio. &lt;/font&gt;</rr:PortfolioTurnoverTextBlock>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.1281</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.0141</rr:AnnualReturn2011>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_Member" unitRef="pure">0.708</rr:PortfolioTurnoverRate>
  <rr:PortfolioTurnoverHeading contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PORTFOLIO TURNOVER.&lt;/b&gt;&lt;/font&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyHeading contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL INVESTMENT STRATEGIES&lt;/b&gt;&lt;/font&gt;</rr:StrategyHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 54.53% of the average value of its portfolio. &lt;/font&gt;</rr:PortfolioTurnoverTextBlock>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;July 31, 2013&lt;/i&gt;&lt;/font&gt;</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <rr:StrategyHeading contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL INVESTMENT STRATEGIES&lt;/b&gt;&lt;/font&gt;</rr:StrategyHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: &lt;/font&gt;</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="USD">122</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="USD">438</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="USD">777</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="USD">1734</rr:ExpenseExampleYear10>
  <rr:RiskNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MARKET RISK&lt;/b&gt; is the risk that the value of equity securities owned by the Fund may decline, at times sharply and unpredictably, because of economic changes or other events that affect individual issuers or large portions of the market. It includes the risk that a particular style of investing, such as growth or value, may underperform the market generally.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;MANAGEMENT RISK&lt;/b&gt; is the risk that a strategy used by the investment management team may fail to produce the intended results.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;MULTI-MANAGER RISK&lt;/b&gt; is the risk that the sub-advisers&amp;#8217; investment styles will not always be complementary, which could affect the performance of the Fund.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;SMALL CAP STOCK RISK&lt;/b&gt; is the risk that stocks of smaller companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Small companies may have limited product lines or financial resources, or may be dependent upon a small or inexperienced management group, and their securities may trade less frequently and in lower volume than the securities of larger companies, which could lead to higher transaction costs. Generally the smaller the company size, the greater the risk.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;PORTFOLIO TURNOVER RISK&lt;/b&gt; is the risk that high portfolio turnover is likely to lead to increased Fund expenses that may result in lower investment returns. High portfolio turnover also is likely to result in higher short-term capital gains taxable to shareholders.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;IPO RISK&lt;/b&gt; is the risk that the market value of shares of IPOs will fluctuate considerably or decline shortly after the IPO, due to factors such as the absence of a prior public market, unseasoned trading, the small number of shares available for trading and limited information about the issuer.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;SECTOR RISK&lt;/b&gt; is the risk that companies in similar businesses may be similarly affected by particular economic or market events, which may, in certain circumstances, cause the value of securities of all companies in a particular sector of the market to decrease. While the Fund may not concentrate in any one industry, the Fund may invest without limitation in a particular market sector.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;TECHNOLOGY SECURITIES RISK&lt;/b&gt; is the risk that securities of technology companies may be subject to greater price volatility than securities of companies in other sectors. These securities may fall in and out of favor with investors rapidly, which may cause sudden selling and dramatically lower market prices. Technology securities also may be affected adversely by changes in technology, consumer and business purchasing patterns, government regulation and/or obsolete products or services. In addition, a rising interest rate environment tends to negatively affect technology companies.&lt;br/&gt;&lt;br/&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank. &lt;/b&gt;&lt;/font&gt;</rr:RiskNarrativeTextBlock>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">-0.0112</rr:AnnualReturn2007>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;In seeking long-term capital appreciation, the Fund will invest, under normal circumstances, at least 80% of its net assets in equity securities of issuers domiciled in emerging and frontier markets. Emerging and frontier markets are defined as those markets included in the MSCI Emerging Markets Index and MSCI Frontier Markets Index. As of May 31, 2012, the indices included the following markets: Argentina, Bahrain, Bangladesh, Brazil, Bulgaria, Chile, China, Colombia, Croatia, Czech Republic, Egypt, Estonia, Hungary, India, Indonesia, Jordan, Kazakhstan, Kenya, Korea, Kuwait, Lebanon, Lithuania, Malaysia, Mauritius, Mexico, Morocco, Nigeria, Oman, Pakistan, Peru, Philippines, Poland, Qatar, Romania, Russia, Serbia, Slovenia, South Africa, Sri Lanka, Taiwan, Thailand, Tunisia, Turkey, Ukraine, United Arab Emirates and Vietnam. These countries are subject to change with changes in the indices. The Fund&amp;#8217;s sub-advisers may also consider emerging and frontier markets as classified by the World Bank, International Finance Corporation or the United Nations and other similar agencies. The Fund may invest in companies of any size located in a number of countries throughout the world.&lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund utilizes a &amp;#8220;multi-manager&amp;#8221; approach whereby the Fund&amp;#8217;s assets are allocated to one or more sub-advisers, in percentages determined at the discretion of the Investment Advisers. Each sub-adviser acts independently from the others and utilizes its own distinct investment style in selecting securities. However, each sub-adviser must operate within the constraints of the Fund&amp;#8217;s investment objective, strategies and restrictions. The Fund utilizes two principal styles intended to complement each other:&lt;/font&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Value style &lt;/i&gt;whereby the sub-advisers seek to identify companies whose improving businesses are not fully recognized by the market and whose securities are thus selling at valuations less than should be expected.&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Growth style&lt;/i&gt; whereby the sub-advisers seek to identify companies that are exhibiting rapid growth in their businesses.&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;When determining the allocations and reallocations to sub-advisers, the Investment Advisers will consider a variety of factors, including but not limited to the sub-adviser&amp;#8217;s style, historical performance, and the characteristics of each sub-adviser&amp;#8217;s allocated assets (including capitalization, growth and profitability measures, valuation metrics, economic sector exposures, and earnings and volatility statistics). The Investment Advisers seek, through their selection of sub-advisers and their allocation determinations, to reduce portfolio volatility and provide an attractive combination of risk and return for the Fund. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The sub-advisers may engage in active trading, and will not consider portfolio turnover a limiting factor in making decisions for the Fund.&lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Morgan Stanley Capital International, Inc. (&amp;#8220;MSCI&amp;#8221;) does not endorse any of the securities in the MSCI Emerging Markets Index or MSCI Frontier Markets Index. It is not a sponsor of the Multi-Manager Emerging Markets Equity Fund and is not affiliated with the Fund in any way. &lt;/i&gt;&lt;/font&gt;</rr:StrategyNarrativeTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 64.16% of the average value of its portfolio. &lt;/font&gt;</rr:PortfolioTurnoverTextBlock>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">-0.3778</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.3049</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.2458</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">-0.0507</rr:AnnualReturn2011>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;In seeking long-term capital appreciation, the Fund will invest, under normal circumstances, at least 80% of its net assets in equity securities of issuers domiciled outside the U.S. The Fund may invest in companies of any size located in a number of countries throughout the world but primarily in the world&amp;#8217;s developed capital markets. The Fund may invest up to 40% of its net assets in issuers domiciled in emerging markets. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund utilizes a &amp;#8220;multi-manager&amp;#8221; approach whereby the Fund&amp;#8217;s assets are allocated to one or more sub-advisers, in percentages determined at the discretion of the Investment Advisers. Each sub-adviser acts independently from the others and utilizes its own distinct investment style in selecting securities. However, each sub-adviser must operate within the constraints of the Fund&amp;#8217;s investment objective, strategies and restrictions. The Fund utilizes two principal styles intended to complement each other: &lt;/font&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Value style &lt;/i&gt;whereby the sub-advisers seek to identify companies whose improving businesses are not fully recognized by the market and whose securities are thus selling at valuations less than should be expected.&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Growth style &lt;/i&gt;whereby the sub-advisers seek to identify companies that are exhibiting rapid growth in their businesses.&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;When determining the allocations and reallocations to sub-advisers, the Investment Advisers will consider a variety of factors, including but not limited to the sub-adviser&amp;#8217;s style, historical performance, and the characteristics of each sub-adviser&amp;#8217;s allocated assets (including capitalization, growth and profitability measures, valuation metrics, economic sector exposures, and earnings and volatility statistics). The Investment Advisers seek, through their selection of sub-advisers and their allocation determinations, to reduce portfolio volatility and provide an attractive combination of risk and return for the Fund. &lt;/font&gt;</rr:StrategyNarrativeTextBlock>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_Member" unitRef="pure">0.6416</rr:PortfolioTurnoverRate>
  <rr:YearToDateReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Year to date total return&lt;/i&gt;&lt;/font&gt;</rr:YearToDateReturnLabel>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member">2012-06-30</rr:BarChartYearToDateReturnDate>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.0758</rr:BarChartYearToDateReturn>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;highest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;In seeking long-term capital appreciation, the Fund will invest, under normal circumstances, at least 80% of its net assets in equity securities of large capitalization companies. Large capitalization companies generally are considered to be those whose market capitalization is, at the time the Fund makes an investment, generally within the range of the market capitalization of the companies in the Russell 1000&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt;&lt;/font&gt; Index (the &amp;#8220;Russell 1000 Index&amp;#8221;). Companies whose capitalization no longer meets this definition after purchase may continue to be considered large capitalization companies. As of May 31, 2012, the market capitalization of the companies in the Russell 1000 Index was between $34.7 million and $538.3 billion. The size of companies in the Index changes with market conditions. In addition, changes to the composition of the Index can change the market capitalization range of companies in the Index. The Fund is not limited to the stocks included in the Russell 1000 Index and may invest in other stocks that meet the criteria discussed below. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund utilizes a &amp;#8220;multi-manager&amp;#8221; approach whereby the Fund&amp;#8217;s assets are allocated to one or more sub-advisers, in percentages determined at the discretion of the Investment Advisers. Each sub-adviser acts independently from the others and utilizes its own distinct investment style in selecting securities. However, each sub-adviser must operate within the constraints of the Fund&amp;#8217;s investment objective, strategies and restrictions. The Fund utilizes two principal styles intended to complement each other: &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Value style &lt;/i&gt;whereby the sub-advisers seek to identify companies whose improving businesses are not fully recognized by the market and whose securities are thus selling at valuations less than should be expected. &lt;/font&gt;&lt;/li&gt;&lt;/ul&gt; &lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Growth style &lt;/i&gt;whereby the sub-advisers seek to identify companies that are exhibiting rapid growth in their businesses. &lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;When determining the allocations and reallocations to sub-advisers, the Investment Advisers will consider a variety of factors, including but not limited to the sub-adviser&amp;#8217;s style, historical performance and the characteristics of each sub-adviser&amp;#8217;s allocated assets (including capitalization, growth and profitability measures, valuation metrics, economic sector exposures, and earnings and volatility statistics). The Investment Advisers seek, through their selection of sub-advisers and their allocation determinations, to reduce portfolio volatility and provide an attractive combination of risk and return for the Fund. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Although the Fund invests primarily in the securities of U.S. issuers, it may make limited investments in the securities of foreign issuers. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Frank Russell Company does not endorse any of the securities in the Russell 1000 Index. It is not a sponsor of the Multi-Manager Large Cap Fund and is not affiliated with the Fund in any way. &lt;/i&gt;&lt;/font&gt;</rr:StrategyNarrativeTextBlock>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member">2010-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.0674</rr:BarChartHighestQuarterlyReturn>
  <rr:RiskHeading contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL RISKS&lt;/b&gt;&lt;/font&gt;</rr:RiskHeading>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;lowest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">-0.0765</rr:BarChartLowestQuarterlyReturn>
  <rr:RiskHeading contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL RISKS&lt;/b&gt;&lt;/font&gt;</rr:RiskHeading>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000026479_MemberC000079432_Member" unitRef="pure">-0.0128</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.0141</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000026479_MemberC000079432_Member" unitRef="pure">0.0128</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberBofMerrillLynchHighYieldMaster_Member" unitRef="pure">0.0437</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member" unitRef="pure">0.0781</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000026479_MemberC000079432_Member" unitRef="pure">0.051</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000026479_MemberC000079432_Member" unitRef="pure">0.0519</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberBofMerrillLynchHighYieldMaster_Member" unitRef="pure">0.1137</rr:AverageAnnualReturnSinceInception>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;In seeking long-term capital appreciation, the Fund will invest, under normal circumstances, at least 80% of its net assets in equity securities of medium capitalization companies. Medium capitalization companies generally are considered to be those whose market capitalization is, at the time the Fund makes an investment, generally within the range of the market capitalization of companies in the Russell Midcap&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt;&lt;/font&gt; Index. Companies whose capitalization no longer meets this definition after purchase may continue to be considered medium capitalization companies. As of May 31, 2012, the market capitalization of the companies in the Russell Midcap Index was between $34.7 million and $21.6 billion. The size of companies in the Russell Midcap&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt;&lt;/font&gt; Index changes with market conditions. In addition, changes to the composition of the Index can change the market capitalization range of companies in the Index. The Fund is not limited to the stocks included in the Russell Midcap&lt;font style="FONT-FAMILY: Times New Roman" size="1"&gt;&lt;sup style="POSITION: relative; BOTTOM: 0.8ex; VERTICAL-ALIGN: baseline"&gt;&amp;#174;&lt;/sup&gt;&lt;/font&gt; Index and may invest in other stocks that meet the criteria discussed below. &lt;/font&gt;&lt;br /&gt;&lt;br /&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund utilizes a &amp;#8220;multi-manager&amp;#8221; approach whereby the Fund&amp;#8217;s assets are allocated to one or more sub-advisers, at percentages determined at the discretion of the Investment Advisers. Each sub-adviser acts independently from the others and utilizes its own distinct investment style in selecting securities. However, each sub-adviser must operate within the constraints of the Fund&amp;#8217;s investment objective, strategies and restrictions. The Fund utilizes two principal styles intended to complement each other: &lt;/font&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; &lt;i&gt;Value style &lt;/i&gt;whereby the sub-advisers seek to identify companies whose improving businesses are not fully recognized by the market and whose securities are thus selling at valuations less than should be expected.&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Growth style &lt;/i&gt;whereby the sub-advisers seek to identify companies that are exhibiting rapid growth in their businesses.&lt;/font&gt;&lt;/li&gt;&lt;/ul&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;When determining the allocations and reallocations to sub-advisers, the Investment Advisers will consider a variety of factors, including but not limited to the sub-adviser&amp;#8217;s style, historical performance, and the characteristics of each sub-adviser&amp;#8217;s allocated assets (including capitalization, growth and profitability measures, valuation metrics, economic sector exposures, and earnings and volatility statistics). The Investment Advisers seek, through their selection of sub-advisers and their allocation determinations, to reduce portfolio volatility and provide an attractive combination of risk and return for the Fund. &lt;/font&gt; &lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund may make significant investments in initial public offerings (&amp;#8220;IPOs&amp;#8221;). &lt;/font&gt; &lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The sub-advisers may engage in active trading, and will not consider portfolio turnover a limiting factor in making decisions for the Fund. &lt;/font&gt; &lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Frank Russell Company does not endorse any of the securities in the Russell Midcap Index. It is not a sponsor of the Multi-Manager Mid Cap Fund and is not affiliated with the Fund in any way. &lt;/i&gt;&lt;/font&gt;</rr:StrategyNarrativeTextBlock>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;highest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;lowest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:RiskHeading contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL RISKS&lt;/b&gt;&lt;/font&gt;</rr:RiskHeading>
  <rr:YearToDateReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Year to date total return&lt;/i&gt;&lt;/font&gt;</rr:YearToDateReturnLabel>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.2206</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">-0.2627</rr:BarChartLowestQuarterlyReturn>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.0822</rr:BarChartYearToDateReturn>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;In seeking long-term capital appreciation and current income, the Fund will invest, under normal circumstances, at least 80% of its net assets in equity securities of real estate companies and real estate related companies (collectively &amp;#8220;real estate companies&amp;#8221;). This means that the Fund will concentrate its investments in companies that derive a significant portion of their revenues from the ownership, construction, financing, management or sale of commercial, industrial or residential real estate or companies that have a significant portion of their assets in these types of real estate-related areas. The Fund will invest in equity-related securities of real estate companies on a global basis, which means that the companies may be U.S. companies or foreign companies. There is no limit on the amount of Fund assets that may be invested in the securities of foreign companies. The Fund anticipates that it will invest greater than 25% of its assets in equity-related securities of real estate companies in the U.S. The Fund does not invest directly in real estate. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund anticipates that its investments in equity-related securities of real estate companies will be primarily in securities of companies known as real estate investment trusts (REITs) or U.S. or non-U.S. REIT-like companies that own and/or manage property. The Fund may invest without limit in the securities of REITs. The Fund may also invest in equity securities of other types of real estate companies including REITs that invest in real estate-related loans. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund utilizes a &amp;#8220;multi-manager&amp;#8221; approach whereby the Fund&amp;#8217;s assets are allocated to one or more sub-advisers, in percentages determined at the discretion of the Investment Advisers. Each sub-adviser acts independently from the others and utilizes its own distinct investment style in selecting securities. However, each sub-adviser must operate within the constraints of the Fund&amp;#8217;s investment objective, strategies and restrictions. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;When determining the allocations and reallocations to sub-advisers, the Investment Advisers will consider a variety of factors, including but not limited to the sub-adviser&amp;#8217;s style, historical performance, and the characteristics of each sub-adviser&amp;#8217;s allocated assets (including capitalization, growth and profitability measures, valuation metrics, economic sector exposures, and earnings and volatility statistics). The Investment Advisers seek, through their selection of sub-advisers and their allocation determinations, to reduce portfolio volatility and provide an attractive combination of risk and return for the Fund. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The sub-advisers may engage in active trading, and will not consider portfolio turnover a limiting factor in making decisions for the Fund. &lt;/font&gt;</rr:StrategyNarrativeTextBlock>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member">2012-06-30</rr:BarChartYearToDateReturnDate>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;br/&gt;&lt;br/&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;PRINCIPAL RISKS &lt;/b&gt;&lt;/font&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MARKET RISK&lt;/b&gt; is the risk that the value of equity securities owned by the Fund may decline, at times sharply and unpredictably, because of economic changes or other events that affect individual issuers or large portions of the market. It includes the risk that a particular style of investing, such as growth or value, may underperform the market generally. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MANAGEMENT RISK&lt;/b&gt; is the risk that a strategy used by the investment management team may fail to produce the intended results. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER RISK&lt;/b&gt; is the risk that the sub-advisers&amp;#8217; investment styles will not always be complementary, which could affect the performance of the Fund. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;SECTOR RISK&lt;/b&gt; is the risk that companies in similar businesses may be similarly affected by particular economic or market events, which may, in certain circumstances, cause the value of securities of all companies in a particular sector of the market to decrease. While the Fund may not concentrate in any one industry, the Fund may invest without limitation in a particular market sector. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;TECHNOLOGY SECURITIES RISK&lt;/b&gt; is the risk that securities of technology companies may be subject to greater price volatility than securities of companies in other sectors. These securities may fall in and out of favor with investors rapidly, which may cause sudden selling and dramatically lower market prices. Technology securities also may be affected adversely by changes in technology, consumer and business purchasing patterns, government regulation and/or obsolete products or services. In addition, a rising interest rate environment tends to negatively affect technology companies. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank. &lt;/b&gt;&lt;/font&gt;</rr:RiskNarrativeTextBlock>
  <rr:RiskNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MARKET RISK&lt;/b&gt; is the risk that the value of equity securities owned by the Fund may decline, at times sharply and unpredictably, because of economic changes or other events that affect individual issuers or large portions of the market. It includes the risk that a particular style of investing, such as growth or value, may underperform the market generally. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MANAGEMENT RISK&lt;/b&gt; is the risk that a strategy used by the investment management team may fail to produce the intended results. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER RISK&lt;/b&gt; is the risk that the sub-advisers&amp;#8217; investment styles will not always be complementary, which could affect the performance of the Fund. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;CURRENCY RISK&lt;/b&gt; is the risk that foreign currencies will fluctuate in value relative to the U.S. dollar, adversely affecting the value of the Fund&amp;#8217;s investments and its returns. Because the Fund&amp;#8217;s net asset value is determined on the basis of U.S. dollars, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the market value of the Fund&amp;#8217;s holdings appreciates. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;EMERGING MARKETS RISK&lt;/b&gt; is the risk that markets of emerging market countries are less developed and less liquid, subject to greater price volatility and generally subject to increased economic, political, regulatory and other uncertainties than more developed markets. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FOREIGN SECURITIES RISK&lt;/b&gt; is the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to less liquid markets, and adverse economic, political, diplomatic, financial, and regulatory factors. Foreign governments also may impose limits on investment and repatriation and impose taxes. Any of these events could cause the value of the Fund&amp;#8217;s investments to decline. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MID CAP STOCK RISK&lt;/b&gt; is the risk that stocks of mid-sized companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Mid-sized companies may have limited product lines or financial resources, and may be dependent upon a particular niche of the market. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;SMALL CAP STOCK RISK&lt;/b&gt; is the risk that stocks of smaller companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Small companies may have limited product lines or financial resources, or may be dependent upon a small or inexperienced management group, and their securities may trade less frequently and in lower volume than the securities of larger companies, which could lead to higher transaction costs. Generally the smaller the company size, the greater the risk. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;SECTOR RISK&lt;/b&gt; is the risk that companies in similar businesses may be similarly affected by particular economic or market events, which may, in certain circumstances, cause the value of securities of all companies in a particular sector of the market to decrease. While the Fund may not concentrate in any one industry, the Fund may invest without limitation in a particular market sector. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank.&lt;/b&gt;&lt;/font&gt;</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FUND PERFORMANCE&lt;/b&gt;&lt;/font&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Updated performance information for the Fund is available and may be obtained on the Fund&amp;#8217;s Web site at www.northernfunds.com or by calling 800-595-9111. &lt;/font&gt;</rr:PerformanceNarrativeTextBlock>
  <rr:RiskLoseMoney contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund.&lt;/b&gt;&lt;/font&gt;</rr:RiskLoseMoney>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank.&lt;/b&gt;&lt;/font&gt;</rr:RiskNotInsuredDepositoryInstitution>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;July 31, 2013&lt;/i&gt;&lt;/font&gt;</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">-0.0507</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000012491_MemberC000033958_Member" unitRef="pure">-0.0662</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000012491_MemberC000033958_Member" unitRef="pure">-0.0153</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberRussellTwoThousandIndex_Member" unitRef="pure">-0.0418</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">-0.0103</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000012491_MemberC000033958_Member" unitRef="pure">-0.0171</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000012491_MemberC000033958_Member" unitRef="pure">-0.0104</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberRussellTwoThousandIndex_Member" unitRef="pure">0.0015</rr:AverageAnnualReturnYear05>
  <rr:RiskNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MARKET RISK&lt;/b&gt; is the risk that the value of equity securities owned by the Fund may decline, at times sharply and unpredictably, because of economic changes or other events that affect individual issuers or large portions of the market. It includes the risk that a particular style of investing, such as growth or value, may underperform the market generally.&lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MANAGEMENT RISK&lt;/b&gt; is the risk that a strategy used by the investment management team may fail to produce the intended results. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER RISK&lt;/b&gt; is the risk that the sub-advisers&amp;#8217; investment styles will not always be complementary, which could affect the performance of the Fund. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;CURRENCY RISK&lt;/b&gt; is the risk that foreign currencies will fluctuate in value relative to the U.S. dollar, adversely affecting the value of the Fund&amp;#8217;s investments and its returns. Because the Fund&amp;#8217;s net asset value is determined on the basis of U.S. dollars, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the market value of the Fund&amp;#8217;s holdings appreciates. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FOREIGN SECURITIES RISK&lt;/b&gt; is the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to less liquid markets, and adverse economic, political, diplomatic, financial, and regulatory factors. Foreign governments also may impose limits on investment and repatriation and impose taxes. Any of these events could cause the value of the Fund&amp;#8217;s investments to decline. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;EMERGING MARKETS RISK&lt;/b&gt; is the risk that markets of emerging market countries are less developed and less liquid, subject to greater price volatility and generally subject to increased economic, political, regulatory and other uncertainties than more developed markets. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FRONTIER MARKETS RISK&lt;/b&gt; is the risk that frontier countries generally have smaller economies or less developed capital markets than traditional emerging markets and, as a result, the risks of investing in emerging market countries are magnified in frontier countries. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MID CAP STOCK RISK&lt;/b&gt; is the risk that stocks of mid-sized companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Mid-sized companies may have limited product lines or financial resources, and may be dependent upon a particular niche of the market. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;SMALL CAP STOCK RISK&lt;/b&gt; is the risk that stocks of smaller companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Small companies may have limited product lines or financial resources, or may be dependent upon a small or inexperienced management group, and their securities may trade less frequently and in lower volume than the securities of larger companies, which could lead to higher transaction costs. Generally the smaller the company size, the greater the risk. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank. &lt;/b&gt;&lt;/font&gt;</rr:RiskNarrativeTextBlock>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member" unitRef="pure">0.0096</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000012491_MemberC000033958_Member" unitRef="pure">0.0031</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000012491_MemberC000033958_Member" unitRef="pure">0.0064</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberRussellTwoThousandIndex_Member" unitRef="pure">0.0274</rr:AverageAnnualReturnSinceInception>
  <rr:RiskLoseMoney contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund.&lt;/b&gt;&lt;/font&gt;</rr:RiskLoseMoney>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;800-595-9111&lt;/font&gt;</rr:PerformanceAvailabilityPhone>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FUND PERFORMANCE &lt;/b&gt;&lt;/font&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;www.northernfunds.com&lt;/font&gt;</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;</rr:PerformancePastDoesNotIndicateFuture>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank.&lt;/b&gt;&lt;/font&gt;</rr:RiskNotInsuredDepositoryInstitution>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Updated performance information for the Fund is available and may be obtained on the Fund&amp;#8217;s Web site at www.northernfunds.com or by calling 800-595-9111. &lt;/font&gt;</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FUND PERFORMANCE &lt;/b&gt;&lt;/font&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:BarChartHeading contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;CALENDAR YEAR TOTAL RETURN*&lt;/b&gt;&lt;/font&gt;</rr:BarChartHeading>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; 800-595-9111&lt;/font&gt;</rr:PerformanceAvailabilityPhone>
  <rr:RiskNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MARKET RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that the value of equity securities owned by the Fund may decline, at times sharply and unpredictably, because of economic changes or other events that affect individual issuers or large portions of the market. It includes the risk that a particular style of investing, such as growth or value, may underperform the market generally. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MANAGEMENT RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that a strategy used by the investment management team may fail to produce the intended results. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that the sub-advisers&amp;#8217; investment styles will not always be complementary, which could affect the performance of the Fund. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;CURRENCY RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that foreign currencies will fluctuate in value relative to the U.S. dollar, adversely affecting the value of the Fund&amp;#8217;s investments and its returns. Because the Fund&amp;#8217;s net asset value is determined on the basis of U.S. dollars, you may lose money if the local currency of a foreign market depreciates against the U.S. dollar, even if the market value of the Fund&amp;#8217;s holdings appreciates. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FOREIGN SECURITIES RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to less liquid markets, and adverse economic, political, diplomatic, financial, and regulatory factors. Foreign governments also may impose limits on investment and repatriation and impose taxes. Any of these events could cause the value of the Fund&amp;#8217;s investments to decline. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MID CAP STOCK RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that stocks of mid-sized companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Mid-sized companies may have limited product lines or financial resources, and may be dependent upon a particular niche of the market. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;SMALL CAP STOCK RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that stocks of smaller companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Small companies may have limited product lines or financial resources, or may be dependent upon a small or inexperienced management group, and their securities may trade less frequently and in lower volume than the securities of larger companies, which could lead to higher transaction costs. Generally the smaller the company size, the greater the risk. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;REAL ESTATE SECURITIES CONCENTRATION RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that investments in securities of real estate companies will make the Fund more susceptible to risks associated with the ownership of real estate and with the real estate industry in general. Real estate companies may have lower trading volumes and may be subject to more abrupt or erratic price movements than the overall securities markets. The value of real estate securities may underperform other sectors of the economy or broader equity markets. To the extent that the Fund concentrates its investments in the real estate sector, it may be subject to greater risk of loss than if it were diversified across different industry sectors. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;REIT RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that the Fund&amp;#8217;s investments will be affected by factors affecting real estate investment trusts (REITs) and the real estate sector generally. Investing in REITs involves certain unique risks in addition to those risks associated with investing in the real estate industry in general. REITs whose underlying properties are concentrated in a particular industry or geographic region are also subject to risks affecting such industries and regions. REITs (especially mortgage REITs) are also subject to interest rate risks. By investing in REITs through the Fund, a shareholder will bear expenses of the REITs in addition to expenses of the Fund. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;INTEREST RATE RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that the value of the Fund&amp;#8217;s assets will decline because of rising interest rates. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;IPO RISK&lt;/b&gt;&lt;/font&gt; &lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; is the risk that the market value of shares of initial public offerings (IPOs) will fluctuate considerably or decline shortly after the initial public offering, due to factors such as the absence of a prior public market, unseasoned trading, the small number of shares available for trading and limited information about the issuer. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank. &lt;/b&gt;&lt;/font&gt;</rr:RiskNarrativeTextBlock>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Updated performance information for the Fund is available and may be obtained on the Fund&amp;#8217;s Web site at www.northernfunds.com or by calling 800-595-9111.&lt;/font&gt;</rr:PerformanceNarrativeTextBlock>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;www.northernfunds.com &lt;/font&gt;</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:RiskNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MARKET RISK&lt;/b&gt; is the risk that the value of equity securities owned by the Fund may decline, at times sharply and unpredictably, because of economic changes or other events that affect individual issuers or large portions of the market. It includes the risk that a particular style of investing, such as growth or value, may underperform the market generally. &lt;/font&gt;&lt;br /&gt;&lt;br /&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MANAGEMENT RISK&lt;/b&gt; is the risk that a strategy used by the investment management team may fail to produce the intended results.&lt;/font&gt;&lt;br /&gt;&lt;br /&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MULTI-MANAGER RISK&lt;/b&gt; is the risk that the sub-advisers&amp;#8217; investment styles will not always be complementary, which could affect the performance of the Fund. &lt;/font&gt;&lt;br /&gt;&lt;br /&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;MID CAP STOCK RISK&lt;/b&gt; is the risk that stocks of mid-sized companies may be subject to more abrupt or erratic market movements than stocks of larger, more established companies. Mid-sized companies may have limited product lines or financial resources, and may be dependent upon a particular niche of the market. &lt;/font&gt;&lt;br /&gt;&lt;br /&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;IPO RISK&lt;/b&gt; is the risk that the market value of shares of IPOs will fluctuate considerably or decline shortly after the IPO, due to factors such as the absence of a prior public market, unseasoned trading, the small number of shares available for trading and limited information about the issuer. &lt;/font&gt;&lt;br /&gt;&lt;br /&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;SECTOR RISK&lt;/b&gt; is the risk that companies in similar businesses may be similarly affected by particular economic or market events, which may, in certain circumstances, cause the value of securities of all companies in a particular sector of the market to decrease. While the Fund may not concentrate in any one industry, the Fund may invest without limitation in a particular market sector. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank. &lt;/b&gt;</rr:RiskNarrativeTextBlock>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartHeading contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;CALENDAR YEAR TOTAL RETURN*&lt;/b&gt;&lt;/font&gt;</rr:BarChartHeading>
  <rr:RiskLoseMoney contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund.&lt;/font&gt;</rr:RiskLoseMoney>
  <rr:BarChartHeading contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;CALENDAR YEAR TOTAL RETURN*&lt;/b&gt;&lt;/font&gt;</rr:BarChartHeading>
  <rr:PerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;AVERAGE ANNUAL TOTAL RETURN&lt;/b&gt;&lt;br/&gt;&lt;i&gt;(For the periods ended December 31, 2011)&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableHeading>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank. &lt;/b&gt;&lt;/font&gt;</rr:RiskNotInsuredDepositoryInstitution>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index.&lt;/font&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">800-595-9111</rr:PerformanceAvailabilityPhone>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;www.northernfunds.com&lt;/font&gt;</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.749</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.2304</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">-0.1773</rr:AnnualReturn2011>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FUND PERFORMANCE &lt;/b&gt;&lt;/font&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.&lt;/font&gt;</rr:PerformancePastDoesNotIndicateFuture>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">-0.1773</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000024144_MemberC000070886_Member" unitRef="pure">-0.1949</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000024144_MemberC000070886_Member" unitRef="pure">-0.093</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberMsciEmergingMarketsIndex_Member" unitRef="pure">-0.1842</rr:AverageAnnualReturnYear01>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Updated performance information for the Fund is available and may be obtained on the Fund&amp;#8217;s Web site at www.northernfunds.com or by calling 800-595-9111. &lt;/font&gt;</rr:PerformanceNarrativeTextBlock>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.2757</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000024144_MemberC000070886_Member" unitRef="pure">0.2551</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000024144_MemberC000070886_Member" unitRef="pure">0.2373</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberMsciEmergingMarketsIndex_Member" unitRef="pure">0.2511</rr:AverageAnnualReturnSinceInception>
  <rr:YearToDateReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Year to date total return&lt;/i&gt;&lt;/font&gt;</rr:YearToDateReturnLabel>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member">2012-06-30</rr:BarChartYearToDateReturnDate>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.0729</rr:BarChartYearToDateReturn>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;highest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:ShareholderFeesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleShareholderFeesNORTHERNMULTIMANAGERSMALLCAPFUND column period compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.1414</rr:BarChartHighestQuarterlyReturn>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;lowest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">-0.1957</rr:BarChartLowestQuarterlyReturn>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;800-595-9111&lt;/font&gt;</rr:PerformanceAvailabilityPhone>
  <rr:YearToDateReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Year to date total return&lt;/i&gt;&lt;/font&gt;</rr:YearToDateReturnLabel>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member">2012-06-30</rr:BarChartYearToDateReturnDate>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;www.northernfunds.com&lt;/font&gt;</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">-0.3649</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.2875</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.1574</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.0006</rr:AnnualReturn2011>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.0327</rr:BarChartYearToDateReturn>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;highest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.2213</rr:BarChartHighestQuarterlyReturn>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;</rr:PerformancePastDoesNotIndicateFuture>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;lowest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member">2008-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">-0.2101</rr:BarChartLowestQuarterlyReturn>
  <rr:OperatingExpensesCaption contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;Annual Fund Operating Expenses&lt;/b&gt; (expenses that you pay each year as a&lt;br/&gt;percentage of the value of your investment)&lt;/font&gt;</rr:OperatingExpensesCaption>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualFundOperatingExpensesNORTHERNMULTIMANAGERSMALLCAPFUND column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;AVERAGE ANNUAL TOTAL RETURN&lt;/b&gt;&lt;br/&gt;&lt;i&gt;(For the periods ended December 31, 2011)&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableHeading>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FUND PERFORMANCE&lt;/b&gt;&lt;/font&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">0.0006</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000018520_MemberC000051395_Member" unitRef="pure">-0.0048</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000018520_MemberC000051395_Member" unitRef="pure">0.0072</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberRussellThousandIndex_Member" unitRef="pure">0.015</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member" unitRef="pure">-0.0183</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000018520_MemberC000051395_Member" unitRef="pure">-0.0205</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000018520_MemberC000051395_Member" unitRef="pure">-0.0157</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberRussellThousandIndex_Member" unitRef="pure">-0.0234</rr:AverageAnnualReturnSinceInception>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleExpenseExampleTransposedNORTHERNMULTIMANAGERSMALLCAPFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.0967</rr:AnnualReturn2007>
  <rr:YearToDateReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt; Year to date total return&lt;/i&gt;&lt;/font&gt;</rr:YearToDateReturnLabel>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">-0.3997</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.2774</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">0.1214</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">-0.1514</rr:AnnualReturn2011>
  <rr:RiskLoseMoney contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;b&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund.&lt;/font&gt;&lt;/b&gt;</rr:RiskLoseMoney>
  <rr:BarChartTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualTotalReturnsNORTHERNMULTI-MANAGERSMALLCAPFUNDBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:ShareholderFeesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleShareholderFeesNORTHERNMULTIMANAGERHIGHYIELDOPPORTUNITYFUND column period compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;&lt;br /&gt;&lt;br /&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;&lt;br /&gt;&lt;br /&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;Updated performance information for the Fund is available and may be obtained on the Fund&amp;#8217;s Web site at www.northernfunds.com or by calling 800-595-9111. &lt;/font&gt;</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member">2012-06-30</rr:BarChartYearToDateReturnDate>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.1449</rr:BarChartYearToDateReturn>
  <rr:PerformanceTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNORTHERNMULTIMANAGERSMALLCAPFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;AVERAGE ANNUAL TOTAL RETURN&lt;/b&gt;&lt;br/&gt;&lt;i&gt;(For the periods ended December 31, 2011)&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableHeading>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;800-595-9111&lt;/font&gt;</rr:PerformanceAvailabilityPhone>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualFundOperatingExpensesNORTHERNMULTIMANAGERHIGHYIELDOPPORTUNITYFUND column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;www.northernfunds.com&lt;/font&gt;</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">-0.1514</rr:AverageAnnualReturnYear01>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;</rr:PerformancePastDoesNotIndicateFuture>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000012492_MemberC000033959_Member" unitRef="pure">-0.1539</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000012492_MemberC000033959_Member" unitRef="pure">-0.0953</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberMsciAcwiExUsIndex_Member" unitRef="pure">-0.1371</rr:AverageAnnualReturnYear01>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;highest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">-0.0436</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000012492_MemberC000033959_Member" unitRef="pure">-0.0484</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000012492_MemberC000033959_Member" unitRef="pure">-0.0377</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberMsciAcwiExUsIndex_Member" unitRef="pure">-0.0292</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member" unitRef="pure">-0.0127</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000012492_MemberC000033959_Member" unitRef="pure">-0.0172</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000012492_MemberC000033959_Member" unitRef="pure">-0.0118</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberMsciAcwiExUsIndex_Member" unitRef="pure">0.0072</rr:AverageAnnualReturnSinceInception>
  <rr:BarChartHeading contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;CALENDAR YEAR TOTAL RETURN*&lt;/b&gt;&lt;/font&gt;</rr:BarChartHeading>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleExpenseExampleTransposedNORTHERNMULTIMANAGERHIGHYIELDOPPORTUNITYFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.3479</rr:BarChartHighestQuarterlyReturn>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;lowest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member">2009-03-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">-0.2209</rr:BarChartLowestQuarterlyReturn>
  <rr:BarChartTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualTotalReturnsNORTHERNMULTI-MANAGERHIGHYIELDOPPORTUNITYFUNDBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;July 31, 2013&lt;/i&gt;&lt;/font&gt;</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <rr:YearToDateReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Year to date total return&lt;/i&gt;&lt;/font&gt;</rr:YearToDateReturnLabel>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member">2012-06-30</rr:BarChartYearToDateReturnDate>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.3625</rr:AnnualReturn2009>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.0604</rr:BarChartYearToDateReturn>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.1749</rr:AnnualReturn2010>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;highest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_Member" unitRef="pure">0.4658</rr:PortfolioTurnoverRate>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">-0.0702</rr:AnnualReturn2011>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.187</rr:BarChartHighestQuarterlyReturn>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;lowest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:PerformanceTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNORTHERNMULTIMANAGERHIGHYIELDOPPORTUNITYFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">-0.2482</rr:BarChartLowestQuarterlyReturn>
  <rr:RiskLoseMoney contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund.&lt;/b&gt;&lt;/font&gt;</rr:RiskLoseMoney>
  <rr:PerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;AVERAGE ANNUAL TOTAL RETURN&lt;/b&gt;&lt;br/&gt;&lt;i&gt;(For the periods ended December 31, 2011)&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableHeading>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableUsesHighestFederalRate>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">-0.0702</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000024145_MemberC000070887_Member" unitRef="pure">-0.0824</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000024145_MemberC000070887_Member" unitRef="pure">-0.0349</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberFtseEpranareitGlobalIndex_Member" unitRef="pure">-0.0872</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.2293</rr:AverageAnnualReturnSinceInception>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank. &lt;/b&gt;&lt;/font&gt;</rr:RiskNotInsuredDepositoryInstitution>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000024145_MemberC000070887_Member" unitRef="pure">0.2105</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000024145_MemberC000070887_Member" unitRef="pure">0.1934</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberFtseEpranareitGlobalIndex_Member" unitRef="pure">0.2245</rr:AverageAnnualReturnSinceInception>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.0705</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">-0.3889</rr:AnnualReturn2008>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.3969</rr:AnnualReturn2009>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.2432</rr:AnnualReturn2010>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableUsesHighestFederalRate>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">-0.0299</rr:AnnualReturn2011>
  <rr:PerformanceTableExplanationAfterTaxHigher contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;800-595-9111&lt;/font&gt;</rr:PerformanceAvailabilityPhone>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">-0.0299</rr:AverageAnnualReturnYear01>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;www.northernfunds.com&lt;/font&gt;</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000012490_MemberC000033957_Member" unitRef="pure">-0.0348</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000012490_MemberC000033957_Member" unitRef="pure">-0.0133</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberRussellMidcapIndex_Member" unitRef="pure">-0.0155</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.0197</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000012490_MemberC000033957_Member" unitRef="pure">0.016</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000012490_MemberC000033957_Member" unitRef="pure">0.0155</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberRussellMidcapIndex_Member" unitRef="pure">0.0142</rr:AverageAnnualReturnYear05>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund&amp;#8217;s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;/font&gt;</rr:PerformancePastDoesNotIndicateFuture>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member" unitRef="pure">0.0327</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributions_MemberS000012490_MemberC000033957_Member" unitRef="pure">0.0292</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012AfterTaxesOnDistributionsAndSales_MemberS000012490_MemberC000033957_Member" unitRef="pure">0.0268</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberRussellMidcapIndex_Member" unitRef="pure">0.0358</rr:AverageAnnualReturnSinceInception>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt; Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:RiskLoseMoney contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;As with any mutual fund, it is possible to lose money on an investment in the Fund.&lt;/b&gt;&lt;/font&gt;</rr:RiskLoseMoney>
  <rr:PerformanceTableExplanationAfterTaxHigher contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableUsesHighestFederalRate>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank. &lt;/b&gt;&lt;/font&gt;</rr:RiskNotInsuredDepositoryInstitution>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY:Times New Roman" size="2"&gt;&lt;i&gt;Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.&lt;/i&gt;&lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member">2008-11-19</rr:AverageAnnualReturnInceptionDate>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;/font&gt;&lt;br /&gt;&lt;br /&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 56.47% of the average value of its portfolio.&lt;/font&gt;</rr:PortfolioTurnoverTextBlock>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.&lt;/font&gt;</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;b&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank.&lt;/font&gt;&lt;/b&gt;</rr:RiskNotInsuredDepositoryInstitution>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">0.0037</rr:OtherExpensesOverAssets>
  <rr:YearToDateReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member">&lt;font style="FONT-FAMILY:Times New Roman" size="2"&gt;&lt;i&gt;Year to date total return&lt;/i&gt;&lt;/font&gt;</rr:YearToDateReturnLabel>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member">2012-06-30</rr:BarChartYearToDateReturnDate>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.0537</rr:BarChartYearToDateReturn>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;highest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">0.3333</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;lowest quarterly return&lt;/i&gt;&lt;/font&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member" unitRef="pure">-0.2225</rr:BarChartLowestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt; The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 80.61% of the average value of its portfolio. &lt;/font&gt;</rr:PortfolioTurnoverTextBlock>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000024145_MemberC000070887_Member" unitRef="pure">-0.02</rr:RedemptionFeeOverRedemption>
  <rr:ShareholderFeesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleShareholderFeesNORTHERNMULTIMANAGERMIDCAPFUND column period compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
  <rr:ShareholderFeesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleShareholderFeesNORTHERNMULTIMANAGERLARGECAPFUND column period compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;FUND PERFORMANCE&lt;/b&gt;&lt;/font&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualFundOperatingExpensesNORTHERNMULTIMANAGERMIDCAPFUND column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualFundOperatingExpensesNORTHERNMULTIMANAGERLARGECAPFUND column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleExpenseExampleTransposedNORTHERNMULTIMANAGERMIDCAPFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleExpenseExampleTransposedNORTHERNMULTIMANAGERLARGECAPFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualTotalReturnsNORTHERNMULTI-MANAGERMIDCAPFUNDBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.&lt;br/&gt;&lt;br/&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index.&lt;br/&gt;&lt;br/&gt;
The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. &lt;br/&gt;&lt;br/&gt;
Updated performance information for the Fund is available and may be obtained on the Fund's Web site at www.northernfunds.com or by calling 800-595-9111.&lt;/font&gt;</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualTotalReturnsNORTHERNMULTI-MANAGERLARGECAPFUNDBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNORTHERNMULTIMANAGERMIDCAPFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNORTHERNMULTIMANAGERLARGECAPFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ShareholderFeesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleShareholderFeesNORTHERNMULTIMANAGERGLOBALREALESTATEFUND column period compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
  <rr:ShareholderFeesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleShareholderFeesNORTHERNMULTIMANAGERINTERNATIONALEQUITYFUND column period compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;July 31, 2013&lt;/i&gt;&lt;/font&gt;</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_01Aug2011_31Jul2012S000012490_Member" unitRef="pure">0.5453</rr:PortfolioTurnoverRate>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualFundOperatingExpensesNORTHERNMULTIMANAGERINTERNATIONALEQUITYFUND column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualFundOperatingExpensesNORTHERNMULTIMANAGERGLOBALREALESTATEFUND column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleExpenseExampleTransposedNORTHERNMULTIMANAGERINTERNATIONALEQUITYFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;b&gt;An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation, any other government agency, or The Northern Trust Company, its affiliates, subsidiaries or any other bank.&lt;/b&gt;&lt;/font&gt;</rr:RiskNotInsuredDepositoryInstitution>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleExpenseExampleTransposedNORTHERNMULTIMANAGERGLOBALREALESTATEFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualTotalReturnsNORTHERNMULTI-MANAGERINTERNATIONALEQUITYFUNDBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:ShareholderFeesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleShareholderFeesNORTHERNMULTIMANAGEREMERGINGMARKETSEQUITYFUND column period compact * ~&lt;/div&gt;</rr:ShareholderFeesTableTextBlock>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing (A) changes in the performance of the Fund from year to year, and (B) how the average annual total returns of the Fund compare to those of a broad-based securities market index. &lt;/font&gt;</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:BarChartTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualTotalReturnsNORTHERNMULTI-MANAGERGLOBALREALESTATEFUNDBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. &lt;/font&gt;</rr:ExpenseNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualFundOperatingExpensesNORTHERNMULTIMANAGEREMERGINGMARKETSEQUITYFUND column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNORTHERNMULTIMANAGERINTERNATIONALEQUITYFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNORTHERNMULTIMANAGERGLOBALREALESTATEFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleExpenseExampleTransposedNORTHERNMULTIMANAGEREMERGINGMARKETSEQUITYFUND column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;/font&gt;&lt;br/&gt;&lt;br/&gt;&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;&lt;br /&gt;&lt;br /&gt;</rr:PerformanceTableNarrativeTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAnnualTotalReturnsNORTHERNMULTI-MANAGEREMERGINGMARKETSEQUITYFUNDBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.&lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;Actual after-tax returns depend on an investor&amp;#8217;s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:PerformanceTableTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;div style="display:none"&gt;~ http://www.northernfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNORTHERNMULTIMANAGEREMERGINGMARKETSEQUITYFUND column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PerformanceTableExplanationAfterTaxHigher contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
  <rr:PerformanceTableExplanationAfterTaxHigher contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
  <rr:PerformanceTableExplanationAfterTaxHigher contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
  <rr:PerformanceTableExplanationAfterTaxHigher contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
  <rr:PerformanceTableExplanationAfterTaxHigher contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;In calculating the federal income taxes due on redemptions, capital gains taxes resulting from redemptions are subtracted from the redemption proceeds and the tax benefits from capital losses resulting from the redemptions are added to the redemption proceeds. Under certain circumstances, the addition of the tax benefits from capital losses resulting from redemptions may cause the Returns After Taxes on Distributions and Sale of Fund Shares to be greater than the Returns After Taxes on Distributions or even the Returns Before Taxes. &lt;/i&gt;&lt;/font&gt;</rr:PerformanceTableExplanationAfterTaxHigher>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund seeks to provide long-term capital appreciation through a diversified portfolio of primarily emerging and frontier market equity securities. Any income received is incidental to this objective.&lt;/font&gt;</rr:ObjectivePrimaryTextBlock>
  <rr:StrategyPortfolioConcentration contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;In seeking long-term capital appreciation and current income, the Fund will invest, under normal circumstances, at least 80% of its net assets in equity securities of real estate companies and real estate related companies (collectively &amp;#8220;real estate companies&amp;#8221;). This means that the Fund will concentrate its investments in companies that derive a significant portion of their revenues from the ownership, construction, financing, management or sale of commercial, industrial or residential real estate or companies that have a significant portion of their assets in these types of real estate-related areas.&lt;/font&gt;</rr:StrategyPortfolioConcentration>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund seeks to provide long-term capital appreciation through a diversified portfolio of primarily medium market capitalization equity securities. Any income received is incidental to this objective.&lt;/font&gt;</rr:ObjectivePrimaryTextBlock>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;The Fund seeks to provide long-term capital appreciation through a diversified portfolio of primarily smaller market capitalization equity securities. Any income received is incidental to this objective.&lt;/font&gt;</rr:ObjectivePrimaryTextBlock>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_01Aug2011_31Jul2012S000012492_MemberC000033959_Member">2006-06-22</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_01Aug2011_31Jul2012S000018520_MemberC000051395_Member">2007-10-17</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_01Aug2011_31Jul2012S000012490_MemberC000033957_Member">2006-06-22</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_01Aug2011_31Jul2012S000012491_MemberC000033958_Member">2006-06-22</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_01Aug2011_31Jul2012S000026479_MemberC000079432_Member">2009-09-23</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_01Aug2011_31Jul2012S000024144_MemberC000070886_Member">2008-11-19</rr:AverageAnnualReturnInceptionDate>
  <rr:BarChartClosingTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024144_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;* Year to date total return for the six months ended June 30, 2012 is 5.37%. For the period shown in the bar chart above, the highest quarterly return was 33.33% in the second quarter of 2009, and the lowest quarterly return was (22.25)% in the third quarter of 2011. &lt;/i&gt;&lt;/font&gt;</rr:BarChartClosingTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_01Aug2011_31Jul2012S000024145_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;* Year to date total return for the six months ended June 30, 2012 is 14.49%. For the period shown in the bar chart above, the highest quarterly return was 34.79% in the second quarter of 2009, and the lowest quarterly return was (22.09)% in the first quarter of 2009. &lt;/i&gt;&lt;/font&gt;</rr:BarChartClosingTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012492_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;*Year to date total return for the six months ended June 30, 2012 is 3.27%. For the periods shown in the bar chart above, the highest quarterly return was 22.13% in the second quarter of 2009, and the lowest quarterly return was (21.01)% in the third quarter of 2008. &lt;/i&gt;&lt;/font&gt;</rr:BarChartClosingTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_01Aug2011_31Jul2012S000018520_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;*Year to date total return for the six months ended June 30, 2012 is 7.29%. For the periods shown in the bar chart above, the highest quarterly return was 14.14% in the second quarter of 2009, and the lowest quarterly return was (19.57)% in the fourth quarter of 2008. &lt;/i&gt;&lt;/font&gt;</rr:BarChartClosingTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012490_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;*Year to date total return for the six months ended June 30, 2012 is 6.04%. For the periods shown in the bar chart above, the highest quarterly return was 18.70% in the third quarter of 2009, and the lowest quarterly return was (24.82)% in the fourth quarter of 2008. &lt;/i&gt;&lt;/font&gt;</rr:BarChartClosingTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_01Aug2011_31Jul2012S000012491_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;*Year to date total return for the six months ended June 30, 2012 is 8.22%. For the periods shown in the bar chart above, the highest quarterly return was 22.06% in the second quarter of 2009, and the lowest quarterly return was (26.27)% in the fourth quarter of 2008. &lt;/i&gt;&lt;/font&gt;</rr:BarChartClosingTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_01Aug2011_31Jul2012S000026479_Member">&lt;font style="FONT-FAMILY: Times New Roman" size="2"&gt;&lt;i&gt;*Year to date total return for the six months ended June 30, 2012 is 7.58%. For the period shown in the bar chart above, the highest quarterly return was 6.74% in the third quarter of 2010, and the lowest quarterly return was (7.65)% in the third quarter of 2011. &lt;/i&gt;&lt;/font&gt;</rr:BarChartClosingTextBlock>
  <link:footnoteLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
    <link:loc xlink:type="locator" xlink:href="#Item_3" xlink:label="FeeWaiverOrReimbursementOverAssets" />
    <link:footnote xlink:type="resource" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_FeeWaiverOrReimbursementOverAssets">The Northern Trust Company of Connecticut and Northern Trust Investments, Inc. (the "Investment Advisers") have contractually agreed to reimburse certain expenses of the Fund (excluding acquired fund fees and expenses; a portion of the compensation paid to each Trustee who is not an officer, director or employee of Northern Trust Corporation or its subsidiaries; expenses related to third-party consultants engaged by the Board of Trustees of the Funds; membership dues paid to the Investment Company Institute and Mutual Fund Directors Forum; extraordinary expenses; and interest, if any) to the extent the "Total Annual Fund Operating Expenses After Expense Reimbursement" exceed 1.30%. This contractual limitation may not be terminated before July 31, 2013 without the approval of the Fund's Board of Trustees.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="FeeWaiverOrReimbursementOverAssets" xlink:to="footnote_FeeWaiverOrReimbursementOverAssets" />
    <link:loc xlink:type="locator" xlink:href="#Item_5" xlink:label="FeeWaiverOrReimbursementOverAssets_2" />
    <link:footnote xlink:type="resource" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets_2" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_FeeWaiverOrReimbursementOverAssets_2">The Northern Trust Company of Connecticut and Northern Trust Investments, Inc. (the "Investment Advisers") have contractually agreed to reimburse certain expenses of the Fund (excluding acquired fund fees and expenses; a portion of the compensation paid to each Trustee who is not an officer, director or employee of Northern Trust Corporation or its subsidiaries; expenses related to third-party consultants engaged by the Board of Trustees of the Funds; membership dues paid to the Investment Company Institute and Mutual Fund Directors Forum; extraordinary expenses; and interest, if any) to the extent the "Total Annual Fund Operating Expenses After Expense Reimbursement" exceed 1.10%. This contractual limitation may not be terminated before July 31, 2013 without the approval of the Fund's Board of Trustees.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="FeeWaiverOrReimbursementOverAssets_2" xlink:to="footnote_FeeWaiverOrReimbursementOverAssets_2" />
    <link:loc xlink:type="locator" xlink:href="#Item_7" xlink:label="FeeWaiverOrReimbursementOverAssets_3" />
    <link:footnote xlink:type="resource" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets_3" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_FeeWaiverOrReimbursementOverAssets_3">The Northern Trust Company of Connecticut and Northern Trust Investments, Inc. (the "Investment Advisers") have contractually agreed to reimburse certain expenses of the Fund (excluding acquired fund fees and expenses; a portion of the compensation paid to each Trustee who is not an officer, director or employee of Northern Trust Corporation or its subsidiaries; expenses related to third-party consultants engaged by the Board of Trustees of the Funds; membership dues paid to the Investment Company Institute and Mutual Fund Directors Forum; extraordinary expenses; and interest, if any) to the extent the "Total Annual Fund Operating Expenses After Expense Reimbursement" exceed 1.40%. This contractual limitation may not be terminated before July 31, 2013 without the approval of the Fund's Board of Trustees.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="FeeWaiverOrReimbursementOverAssets_3" xlink:to="footnote_FeeWaiverOrReimbursementOverAssets_3" />
    <link:loc xlink:type="locator" xlink:href="#Item_4" xlink:label="FeeWaiverOrReimbursementOverAssets_4" />
    <link:footnote xlink:type="resource" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets_4" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_FeeWaiverOrReimbursementOverAssets_4">The Northern Trust Company of Connecticut and Northern Trust Investments, Inc. (the "Investment Advisers") have contractually agreed to reimburse certain expenses of the Fund (excluding acquired fund fees and expenses; a portion of the compensation paid to each Trustee who is not an officer, director or employee of Northern Trust Corporation or its subsidiaries; expenses related to third-party consultants engaged by the Board of Trustees of the Funds; membership dues paid to the Investment Company Institute and Mutual Fund Directors Forum; extraordinary expenses; and interest, if any) to the extent the "Total Annual Fund Operating Expenses After Expense Reimbursement" exceed 1.35%. This contractual limitation may not be terminated before July 31, 2013 without the approval of the Fund's Board of Trustees.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="FeeWaiverOrReimbursementOverAssets_4" xlink:to="footnote_FeeWaiverOrReimbursementOverAssets_4" />
    <link:loc xlink:type="locator" xlink:href="#Item_6" xlink:label="FeeWaiverOrReimbursementOverAssets_5" />
    <link:footnote xlink:type="resource" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets_5" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_FeeWaiverOrReimbursementOverAssets_5">The Northern Trust Company of Connecticut and Northern Trust Investments, Inc. (the "Investment Advisers") have contractually agreed to reimburse certain expenses of the Fund (excluding acquired fund fees and expenses; a portion of the compensation paid to each Trustee who is not an officer, director or employee of Northern Trust Corporation or its subsidiaries; expenses related to third-party consultants engaged by the Board of Trustees of the Funds; membership dues paid to the Investment Company Institute and Mutual Fund Directors Forum; extraordinary expenses; and interest, if any) to the extent the "Total Annual Fund Operating Expenses After Expense Reimbursement" exceed 1.10%. This contractual limitation may not be terminated before July 31, 2013 without the approval of the Fund's Board of Trustees.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="FeeWaiverOrReimbursementOverAssets_5" xlink:to="footnote_FeeWaiverOrReimbursementOverAssets_5" />
    <link:loc xlink:type="locator" xlink:href="#Item_8" xlink:label="FeeWaiverOrReimbursementOverAssets_6" />
    <link:footnote xlink:type="resource" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets_6" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_FeeWaiverOrReimbursementOverAssets_6">The Northern Trust Company of Connecticut and Northern Trust Investments, Inc. (the "Investment Advisers") have contractually agreed to reimburse certain expenses of the Fund (excluding acquired fund fees and expenses; a portion of the compensation paid to each Trustee who is not an officer, director or employee of Northern Trust Corporation or its subsidiaries; expenses related to third-party consultants engaged by the Board of Trustees of the Funds; membership dues paid to the Investment Company Institute and Mutual Fund Directors Forum; extraordinary expenses; and interest, if any) to the extent the "Total Annual Fund Operating Expenses After Expense Reimbursement" exceed 1.20%. This contractual limitation may not be terminated before July 31, 2013 without the approval of the Fund's Board of Trustees.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="FeeWaiverOrReimbursementOverAssets_6" xlink:to="footnote_FeeWaiverOrReimbursementOverAssets_6" />
    <link:loc xlink:type="locator" xlink:href="#Item_2" xlink:label="FeeWaiverOrReimbursementOverAssets_7" />
    <link:footnote xlink:type="resource" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets_7" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_FeeWaiverOrReimbursementOverAssets_7">The Northern Trust Company of Connecticut and Northern Trust Investments, Inc. (the "Investment Advisers") have contractually agreed to reimburse certain expenses of the Fund (excluding acquired fund fees and expenses; a portion of the compensation paid to each Trustee who is not an officer, director or employee of Northern Trust Corporation or its subsidiaries; expenses related to third-party consultants engaged by the Board of Trustees of the Funds; membership dues paid to the Investment Company Institute and Mutual Fund Directors Forum; extraordinary expenses; and interest, if any) to the extent the "Total Annual Fund Operating Expenses After Expense Reimbursement" exceed 1.00%. This contractual limitation may not be terminated before July 31, 2013 without the approval of the Fund's Board of Trustees.</link:footnote>
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="FeeWaiverOrReimbursementOverAssets_7" xlink:to="footnote_FeeWaiverOrReimbursementOverAssets_7" />
  </link:footnoteLink>
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