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  <rr:RiskReturnHeading contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;Federated Max-Cap Index Fund (the "Fund")&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE&lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">The Fund's investment objective is to provide investment results that generally correspond to the aggregate price and performance of publicly traded common stocks comprising the Standard &amp;amp; Poor's 500 Index.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;RISK/RETURN SUMMARY: FEES AND EXPENSES&lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">This table describes the fees and expenses that you may pay if you buy and hold Class C Shares (C), Class R Shares (R), Institutional Shares (IS) and Service Shares (SS) of the Fund.</rr:ExpenseNarrativeTextBlock>
  <rr:ShareholderFeesCaption contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;Shareholder Fees (f ees paid directly from your investment)&lt;/b&gt;</rr:ShareholderFeesCaption>
  <rr:OperatingExpensesCaption contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)&lt;/b&gt;</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.&lt;br/&gt;&lt;br/&gt;The Example assumes that you invest $10,000 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 operating expenses are as shown in the table above and remain the same. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" 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 Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 38% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;RISK/RETURN SUMMARY: INVESTMENTS, RISKS and PERFORMANCE &lt;/b&gt;&lt;br/&gt;&lt;br/&gt;&lt;b&gt;What are the Fund's Main Investment Strategies? &lt;/b&gt;</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">The Fund normally invests its assets primarily in common stocks included in the Standard &amp;amp; Poor's 500 Index (Index). The Index is a broad-based market index that measures the performance of the broad domestic economy through changes in the aggregate market value of 500 stocks representing all major industries. Under normal circumstances, the Manager will also use enhanced management techniques as further described in the Prospectus in an attempt to improve the performance of its portfolio relative to the Index to compensate for Fund expenses and tracking error. The Manager's principal enhanced technique will be to slightly over or under-weight positions in a limited number of securities within the Index based upon the Manager's quantitative analysis of the securities. The Fund may invest in derivative contracts (such as, for example, futures contracts, option contracts and swap contracts), hybrid instruments or convertible securities to implement its investment strategies as more fully described in the Prospectus.&lt;br/&gt;&lt;br/&gt;Because the Fund refers to index investments in its name, it will notify shareholders at least 60 days in advance of any changes in its investment policies that would enable the Fund to normally invest less than 80% of its assets (plus any borrowings for investment purposes) in index investments. &lt;br/&gt;&lt;br/&gt;The Fund's investment manager ("Manager") has received an exemptive order from the SEC to permit the Trust and the Board of Trustees (the "Board") to appoint and replace subadvisers for the Fund and to enter into and amend the Fund's subadvisory agreements without further shareholder approval.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;What are the Main Risks of Investing in the Fund? &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund's returns include:&lt;ul type="square"&gt;&lt;li style="margin-left:20px"&gt;&lt;b&gt;Stock Market Risk.&lt;/b&gt; The value of equity securities in the Fund's portfolio will fluctuate and, as a result, the Fund's Share price may decline suddenly or over a sustained period of time.&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left:20px"&gt;&lt;b&gt;Sector Risk.&lt;/b&gt; Because the Fund may allocate relatively more assets to certain industry sectors than others, the Fund's performance may be more susceptible to any developments which affect those sectors emphasized by the Fund. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left:20px"&gt;&lt;b&gt;Leverage Risk.&lt;/b&gt; Leverage risk is created when an investment exposes the Fund to a level of risk that exceeds the amount invested. Changes in the value of such an investment magnify the Fund's risk of loss and potential for gain. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left:20px"&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; Liquidity risk refers to the possibility that the Fund may not be able to sell a security or close out a derivative contract when it wants to. If this happens, the Fund will be required to continue to hold the security or keep the position open, and the Fund could incur losses. Over-the-counter (OTC) derivative contracts generally carry greater liquidity risk than exchange-traded contracts. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left:20px"&gt;&lt;b&gt;Risk of Investing in Derivative Contracts and Hybrid Instruments.&lt;/b&gt; Derivative contracts and hybrid instruments involve risks different from, or possibly greater than, risks associated with investing directly in securities and other traditional investments. Specific risk issues related to the use of such contracts and instruments include valuation and tax issues, increased potential for losses and/or costs to the Fund, and a potential reduction in gains to the Fund. Each of these issues is described in greater detail in this Prospectus. Derivative contracts and hybrid instruments may also involve other risks described in this Prospectus or the Fund's Statement of Additional Information (SAI), such as stock market, credit, liquidity and leverage risks. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left:20px"&gt;&lt;b&gt;Counterparty Credit Risk.&lt;/b&gt; Credit risk includes the possibility that a party to a transaction involving the Fund will fail to meet its obligations. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left:20px"&gt;&lt;b&gt;Exchange-Traded Funds Risk.&lt;/b&gt; An investment in an exchange-traded fund (ETF) generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange-traded) that has the same investment objectives, strategies and policies. The price of an ETF can fluctuate up or down, and the Fund could lose money investing in an ETF if the prices of the securities owned by the ETF go down. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left:20px"&gt;&lt;b&gt;Technology Risk.&lt;/b&gt; Proprietary and third party data and systems are utilized to support decision making for the Fund. Data imprecision, software or other technology malfunctions, programming inaccuracies and similar circumstances may impair the performance of these systems, which may negatively affect Fund performance. &lt;/li&gt;&lt;/ul&gt;The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;Performance: Bar Chart and Table &lt;/b&gt;&lt;br/&gt;&lt;br/&gt;&lt;b&gt;Risk/Return Bar Chart &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund's investment risks in light of its historical returns. The bar chart shows the variability of the Fund's IS class total returns on a calendar year-by-year basis. The Average Annual Total Return table shows returns averaged over the stated periods, and includes comparative performance information. The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results. Updated performance information for the Fund is available under the "Products" section at FederatedInvestors.com or by calling 1-800-341-7400.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartHeading contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">Federated Max-Cap Index Fund - IS Class</rr:BarChartHeading>
  <rr:BarChartClosingTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">The Fund's IS class total return for the nine-month period from January 1, 2012 to September 30, 2012, was 15.99%.&lt;br/&gt;&lt;br/&gt;Within the periods shown in the bar chart, the Fund's IS class highest quarterly return was 15.75% (quarter ended June 30, 2009). Its lowest quarterly return was (21.96)% (quarter ended December 31, 2008).</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">&lt;b&gt;Average Annual Total Return Table &lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">R class commenced operations on April 8, 2003. For the period prior to the commencement of operations of R class, the performance information shown is for IS class, adjusted to reflect the expenses of R class. In addition to Return Before Taxes, Return After Taxes is shown for the Fund's IS class to illustrate the effect of federal taxes on Fund returns. After-tax returns are shown only for IS class, and after-tax returns for C, R and SS classes will differ from those shown for IS class. Actual after-tax returns depend on each investor's personal tax situation, and are likely to differ from those shown. After-tax returns are calculated using a standard set of assumptions. The stated returns assume the highest historical &lt;b&gt;federal&lt;/b&gt; income and capital gains tax rates. These after-tax returns do &lt;b&gt;not&lt;/b&gt; reflect the effect of any applicable &lt;b&gt;state&lt;/b&gt; and &lt;b&gt;local&lt;/b&gt; taxes. After-tax returns are not relevant to investors holding shares through a 401(k) plan, an Individual Retirement Account or other tax-advantaged investment plan.&lt;br/&gt;&lt;br/&gt;(For the Period Ended December 31, 2011)</rr:PerformanceTableNarrativeTextBlock>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">January 1, 2014</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <fit7:FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">up to but not including the later of (the "Termination Date"): (a) January 1, 2014; or (b) the date of the Fund's next effective Prospectus.</fit7:FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_Member" unitRef="pure">0.38</rr:PortfolioTurnoverRate>
  <rr:RiskLoseMoney contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund.</rr:RiskLoseMoney>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.</rr:RiskNotInsuredDepositoryInstitution>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">The bar chart shows the variability of the Fund's IS class total returns on a calendar year-by-year basis.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">1-800-341-7400</rr:PerformanceAvailabilityPhone>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">FederatedInvestors.com</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">The stated returns assume the highest historical &lt;b&gt;federal&lt;/b&gt; income and capital gains tax rates. These after-tax returns do &lt;b&gt;not&lt;/b&gt; reflect the effect of any applicable &lt;b&gt;state&lt;/b&gt; and &lt;b&gt;local&lt;/b&gt; taxes.</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">After-tax returns are not relevant to investors holding shares through a 401(k) plan, an Individual Retirement Account or other tax-advantaged investment plan.</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="Duration_01Jan2012_31Dec2012S000009097_Member">In addition to Return Before Taxes, Return After Taxes is shown for the Fund's IS class to illustrate the effect of federal taxes on Fund returns.</rr:PerformanceTableOneClassOfAfterTaxShown>
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  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;div style="display:none"&gt;~ http://www.federatedinvestors.com/role/ScheduleAnnualFundOperatingExpensesFederatedMid-CapIndexFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;div style="display:none"&gt;~ http://www.federatedinvestors.com/role/ScheduleExpenseExampleTransposedFederatedMid-CapIndexFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;div style="display:none"&gt;~ http://www.federatedinvestors.com/role/ScheduleAnnualTotalReturnsFederatedMid-CapIndexFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;div style="display:none"&gt;~ http://www.federatedinvestors.com/role/ScheduleAverageAnnualTotalReturnsTransposedFederatedMid-CapIndexFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:MaximumDeferredSalesChargeOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0.01</rr:MaximumDeferredSalesChargeOverOther>
  <rr:MaximumDeferredSalesChargeOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOther>
  <rr:MaximumDeferredSalesChargeOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOther>
  <rr:MaximumDeferredSalesChargeOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOther>
  <rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0</rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther>
  <rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0</rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther>
  <rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0</rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther>
  <rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0</rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0</rr:RedemptionFeeOverRedemption>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0</rr:RedemptionFeeOverRedemption>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0</rr:RedemptionFeeOverRedemption>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0</rr:RedemptionFeeOverRedemption>
  <rr:ExchangeFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0</rr:ExchangeFeeOverRedemption>
  <rr:ExchangeFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0</rr:ExchangeFeeOverRedemption>
  <rr:ExchangeFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0</rr:ExchangeFeeOverRedemption>
  <rr:ExchangeFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0</rr:ExchangeFeeOverRedemption>
  <rr:RiskReturnHeading contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;b&gt;Federated Mid-Cap Index Fund (the "Fund")&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;b&gt;RISK/RETURN SUMMARY: INVESTMENT OBJECTIVE &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">The Fund's investment objective is to provide investment results generally corresponding to the aggregate price and dividend performance of the publicly traded common stocks that comprise the mid-level stock capitalization sector of the U.S. equity market.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;b&gt;RISK/RETURN SUMMARY: FEES AND EXPENSES &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">This table describes the fees and expenses that you may pay if you buy and hold Institutional Shares (IS) and Service Shares (SS) of the Fund.</rr:ExpenseNarrativeTextBlock>
  <rr:ShareholderFeesCaption contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">Shareholder Fees (fees paid directly from your investment)</rr:ShareholderFeesCaption>
  <rr:OperatingExpensesCaption contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;b&gt;Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) &lt;/b&gt;</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;b&gt;Example&lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.&lt;br/&gt;&lt;br/&gt;The Example assumes that you invest $10,000 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 operating expenses are as shown in the table above and remain the same. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyHeading contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;b&gt;RISK/RETURN SUMMARY: INVESTMENTS, RISKS and PERFORMANCE&lt;br/&gt;&lt;br/&gt;What are the Fund's Main Investment Strategies &lt;/b&gt;</rr:StrategyHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" 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 Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 18% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">The Fund normally invests its assets primarily in common stocks included in the Standard &amp;amp; Poor's MidCap 400 Index (Index). The Index is a broad-based market capitalization-weighted index of common stocks representing all major industries in the mid range of the U.S. stock market. Under normal circumstances, the Manager will also use enhanced management techniques as further described in the Prospectus in an attempt to improve the performance of its portfolio relative to the Index to compensate for Fund expenses and tracking error. The Manager's principal enhanced technique will be to slightly over or underweight positions in a limited number of securities within the Index based upon the Manager's quantitative analysis of the securities. The Fund may invest in derivatives contracts (such as, for example, futures contracts, option contracts and swap contracts), hybrid instruments or convertible securities to implement its investment strategies as more fully described in the Prospectus. &lt;br/&gt;&lt;br/&gt;Because the Fund refers to index investments in its name, it will notify shareholders at least 60 days in advance of any changes in its investment policies that would enable the Fund to normally invest less than 80% of its assets (plus any borrowings for investment purposes) in index investments. &lt;br/&gt;&lt;br/&gt;The Fund's investment manager ("Manager") has received an exemptive order from the SEC to permit the Trust and the Board of Trustees (the "Board") to appoint and replace subadvisers for the Fund and to enter into and amend the Fund's subadvisory agreements without further shareholder approval.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;b&gt;What are the Main Risks of Investing in the Fund? &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund's returns include:&lt;ul type="square"&gt;&lt;li style="margin-left: 20px"&gt;&lt;b&gt;Stock Market Risk.&lt;/b&gt; The value of equity securities in the Fund's portfolio will fluctuate and, as a result, the Fund's Share price may decline suddenly or over a sustained period of time. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left: 20px"&gt;&lt;b&gt;Medium-Sized Companies Risk.&lt;/b&gt; The Fund may invest in mid-sized companies. Mid-capitalization companies often have narrower markets and limited managerial and financial resources compared to larger, more established companies. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left: 20px"&gt;&lt;b&gt;Sector Risk.&lt;/b&gt; Because the Fund may allocate relatively more assets to certain industry sectors than others, the Fund's performance may be more susceptible to any developments that affect those sectors emphasized by the Fund. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left: 20px"&gt;&lt;b&gt;Risk of Investing in Derivative Contracts and Hybrid Instruments.&lt;/b&gt; Derivative contracts and hybrid instruments involve risks different from, or possibly greater than, risks associated with investing directly in securities and other traditional investments. Specific risk issues related to the use of such contracts and instruments include valuation and tax issues, increased potential for losses and/or costs to the Fund and a potential reduction in gains to the Fund. Each of these issues is described in greater detail in this Prospectus. Derivative contracts and hybrid instruments may also involve other risks described in this Prospectus or the Fund's Statement of Additional Information (SAI), such as stock market, credit, liquidity and leverage risks. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left: 20px"&gt;&lt;b&gt;Leverage Risk.&lt;/b&gt; Leverage risk is created when an investment exposes the Fund to a level of risk that exceeds the amount invested. Changes in the value of such an investment magnify the Fund's risk of loss and potential for gain.&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left: 20px"&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; Liquidity risk refers to the possibility that the Fund may not be able to sell a security or close out a derivative contract when it wants to. If this happens, the Fund will be required to continue to hold the security or keep the position open, and the Fund could incur losses. Over-the-counter (OTC) derivative contracts generally carry greater liquidity risk than exchange-traded contracts.&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left: 20px"&gt;&lt;b&gt;Counterparty Credit Risk.&lt;/b&gt; Credit risk includes the possibility that a party to a transaction involving the Fund will fail to meet its obligations. &lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left: 20px"&gt;&lt;b&gt;Exchange-Traded Funds Risk.&lt;/b&gt; An investment in an exchange-traded fund (ETF) generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange-traded) that has the same investment objectives, strategies and policies. The price of an ETF can fluctuate up or down, and the Fund could lose money investing in an ETF if the prices of the securities owned by the ETF go down.&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li style="margin-left: 20px"&gt;&lt;b&gt;Technology Risk.&lt;/b&gt; Proprietary and third-party data and systems are utilized to support decision making for the Fund. Data imprecision, software or other technology malfunctions, programming inaccuracies and similar circumstances may impair the performance of these systems, which may negatively affect Fund performance. &lt;/li&gt;&lt;/ul&gt;The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;b&gt;Performance: Bar Chart and Table &lt;br/&gt;&lt;br/&gt;Risk/Return Bar Chart &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">The Fund's IS class commenced operations on or about January 4, 2012. The bar chart and performance table below reflect historical performance data for the Fund and are intended to help you analyze the Fund's SS class investment risks in light of its historical returns. The bar chart shows the variability of the Fund's total returns on a calendar year-by-year basis. The Average Annual Total Return table shows returns averaged over the stated periods, and includes comparative performance information. The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results. Updated performance information for the Fund is available under the "Products" section at FederatedInvestors.com or by calling 1-800-341-7400.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartHeading contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">Federated Mid-Cap Index Fund - SS Class</rr:BarChartHeading>
  <rr:BarChartClosingTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">The Fund's SS class total return for the nine-month period from January 1, 2012 to September 30, 2012, was 13.46%. &lt;br/&gt;&lt;br/&gt;Within the periods shown in the bar chart, the Fund's SS class highest quarterly return was 19.83% (quarter ended September 30, 2009). Its lowest quarterly return was (25.62)% (quarter ended December 31, 2008).</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">&lt;b&gt;Average Annual Total Return Table&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">The IS class commenced operations on January 4, 2012. Accordingly, for the period prior to the commencement of operations, the performance information shown in the Average Annual Total Return Table is for the Fund's SS class, adjusted to remove any voluntary waiver of Fund expenses related to the SS class that occurred prior to the commencement of operations of the IS class. &lt;br/&gt;&lt;br/&gt;In addition to Return Before Taxes, Return After Taxes is shown for the Fund's SS class to illustrate the effect of federal taxes on Fund returns. After tax-return are shown only for SS class and after-tax returns for IS class may differ from those shown for SS class. Actual after-tax returns depend on each investor's personal tax situation, and are likely to differ from those shown. After-tax returns are calculated using a standard set of assumptions. The stated returns assume the highest historical &lt;b&gt;federal&lt;/b&gt; income and capital gains tax rates. These after-tax returns do &lt;b&gt;not&lt;/b&gt; reflect the effect of any applicable &lt;b&gt;state&lt;/b&gt; and &lt;b&gt;local&lt;/b&gt; taxes. After-tax returns are not relevant to investors holding shares through tax-deferral programs, such as a 401(k) plan, an Individual Retirement Account or other tax-advantaged investment plan. &lt;br/&gt;&lt;br/&gt;(For the Period Ended December 31, 2011)</rr:PerformanceTableNarrativeTextBlock>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">January 1, 2014</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <fit7:FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">up to but not including the later of (the "Termination Date"): (a) January 1, 2014; or (b) the date of the Fund's next effective Prospectus.</fit7:FeeWaiverOrReimbursementOverAssetsLaterOfTerminationOrNextEffectiveProspectus>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_Member" unitRef="pure">0.18</rr:PortfolioTurnoverRate>
  <rr:RiskLoseMoney contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund.</rr:RiskLoseMoney>
  <rr:RiskNotInsuredDepositoryInstitution contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">The Shares offered by this Prospectus are not deposits or obligations of any bank, are not endorsed or guaranteed by any bank and are not insured or guaranteed by the U.S. government, the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.</rr:RiskNotInsuredDepositoryInstitution>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">The bar chart shows the variability of the Fund's total returns on a calendar year-by-year basis.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAvailabilityPhone contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">1-800-341-7400</rr:PerformanceAvailabilityPhone>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">FederatedInvestors.com</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">The Fund's performance will fluctuate, and past performance (before and after taxes) is not necessarily an indication of future results.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">The stated returns assume the highest historical &lt;b&gt;federal&lt;/b&gt; income and capital gains tax rates. These after-tax returns do &lt;b&gt;not&lt;/b&gt; reflect the effect of any applicable &lt;b&gt;state&lt;/b&gt; and &lt;b&gt;local&lt;/b&gt; taxes.</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">After-tax returns are not relevant to investors holding shares through tax-deferral programs, such as a 401(k) plan, an Individual Retirement Account or other tax-advantaged investment plan.</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:PerformanceTableOneClassOfAfterTaxShown contextRef="Duration_01Jan2012_31Dec2012S000009098_Member">In addition to Return Before Taxes, Return After Taxes is shown for the Fund's SS class to illustrate the effect of federal taxes on Fund returns.</rr:PerformanceTableOneClassOfAfterTaxShown>
  <rr:YearToDateReturnLabel contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member">The Fund's SS class total return for the nine-month period from January 1, 2012 to September 30, 2012</rr:YearToDateReturnLabel>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member">2012-09-30</rr:BarChartYearToDateReturnDate>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.1346</rr:BarChartYearToDateReturn>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member">highest quarterly return</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.1983</rr:BarChartHighestQuarterlyReturn>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member">lowest quarterly return</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">-0.2562</rr:BarChartLowestQuarterlyReturn>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">-0.0225</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">-0.0225</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributions_MemberS000009098_MemberC000024712_Member" unitRef="pure">-0.0314</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributionsAndSales_MemberS000009098_MemberC000024712_Member" unitRef="pure">-0.0059</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 id="Item_2" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberStandardAndPoorsMidcapFourHundredIndex_Member" unitRef="pure">-0.0173</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0.0292</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.0293</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributions_MemberS000009098_MemberC000024712_Member" unitRef="pure">0.0202</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributionsAndSales_MemberS000009098_MemberC000024712_Member" unitRef="pure">0.0236</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 id="Item_3" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberStandardAndPoorsMidcapFourHundredIndex_Member" unitRef="pure">0.0331</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0.0653</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributions_MemberS000009098_MemberC000024712_Member" unitRef="pure">0.0573</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributionsAndSales_MemberS000009098_MemberC000024712_Member" unitRef="pure">0.0557</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 id="Item_4" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberStandardAndPoorsMidcapFourHundredIndex_Member" unitRef="pure">0.0704</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.0655</rr:AverageAnnualReturnYear10>
  <rr:AnnualReturn2002 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">-0.1516</rr:AnnualReturn2002>
  <rr:AnnualReturn2003 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.3496</rr:AnnualReturn2003>
  <rr:AnnualReturn2004 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.1585</rr:AnnualReturn2004>
  <rr:AnnualReturn2005 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.1201</rr:AnnualReturn2005>
  <rr:AnnualReturn2006 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.0985</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.0758</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">-0.3635</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.3693</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.2603</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">-0.0225</rr:AnnualReturn2011>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="USD">54</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="USD">77</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="USD">170</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="USD">240</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="USD">296</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="USD">417</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="USD">665</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="USD">930</rr:ExpenseExampleYear10>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0.004</rr:ManagementFeesOverAssets>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.004</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0.0012</rr:OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.0034</rr:OtherExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0.0053</rr:ExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.0075</rr:ExpensesOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_5" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">-0.0023</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_6" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">-0.002</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0.003</rr:NetExpensesOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0.0055</rr:NetExpensesOverAssets>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0.003</rr:ManagementFeesOverAssets>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0.003</rr:ManagementFeesOverAssets>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.003</rr:ManagementFeesOverAssets>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0.003</rr:ManagementFeesOverAssets>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:MaximumDeferredSalesChargeOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOther>
  <rr:MaximumDeferredSalesChargeOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOther>
  <rr:DistributionAndService12b1FeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0.0075</rr:DistributionAndService12b1FeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0.005</rr:DistributionAndService12b1FeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0.003</rr:DistributionAndService12b1FeesOverAssets>
  <rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0</rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther>
  <rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0</rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0.0045</rr:OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0.0037</rr:OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.0038</rr:OtherExpensesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0.0044</rr:OtherExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0</rr:RedemptionFeeOverRedemption>
  <rr:RedemptionFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0</rr:RedemptionFeeOverRedemption>
  <rr:ExchangeFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000111618_Member" unitRef="pure">0</rr:ExchangeFeeOverRedemption>
  <rr:ExchangeFeeOverRedemption decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009098_MemberC000024712_Member" unitRef="pure">0</rr:ExchangeFeeOverRedemption>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0.0151</rr:ExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0.0118</rr:ExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.0069</rr:ExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0.0105</rr:ExpensesOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_7" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">-0.0007</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_8" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">-0.0007</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_9" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">-0.0033</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:FeeWaiverOrReimbursementOverAssets id="Item_10" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">-0.0039</rr:FeeWaiverOrReimbursementOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0.0144</rr:NetExpensesOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0.0111</rr:NetExpensesOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.0036</rr:NetExpensesOverAssets>
  <rr:NetExpensesOverAssets decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0.0066</rr:NetExpensesOverAssets>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="USD">254</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="USD">120</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="USD">70</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="USD">107</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="USD">824</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="USD">649</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="USD">384</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="USD">579</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="USD">1802</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="USD">1432</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="USD">859</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="USD">1283</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleNoRedemptionYear01 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="USD">154</rr:ExpenseExampleNoRedemptionYear01>
  <rr:ExpenseExampleNoRedemptionYear01 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="USD">120</rr:ExpenseExampleNoRedemptionYear01>
  <rr:ExpenseExampleNoRedemptionYear01 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="USD">70</rr:ExpenseExampleNoRedemptionYear01>
  <rr:ExpenseExampleNoRedemptionYear01 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="USD">107</rr:ExpenseExampleNoRedemptionYear01>
  <rr:ExpenseExampleNoRedemptionYear03 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="USD">477</rr:ExpenseExampleNoRedemptionYear03>
  <rr:ExpenseExampleNoRedemptionYear03 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="USD">375</rr:ExpenseExampleNoRedemptionYear03>
  <rr:ExpenseExampleNoRedemptionYear03 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="USD">221</rr:ExpenseExampleNoRedemptionYear03>
  <rr:ExpenseExampleNoRedemptionYear03 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="USD">334</rr:ExpenseExampleNoRedemptionYear03>
  <rr:ExpenseExampleNoRedemptionYear05 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="USD">824</rr:ExpenseExampleNoRedemptionYear05>
  <rr:ExpenseExampleNoRedemptionYear05 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="USD">649</rr:ExpenseExampleNoRedemptionYear05>
  <rr:ExpenseExampleNoRedemptionYear05 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="USD">384</rr:ExpenseExampleNoRedemptionYear05>
  <rr:ExpenseExampleNoRedemptionYear05 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="USD">579</rr:ExpenseExampleNoRedemptionYear05>
  <rr:ExpenseExampleNoRedemptionYear10 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="USD">1802</rr:ExpenseExampleNoRedemptionYear10>
  <rr:ExpenseExampleNoRedemptionYear10 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="USD">1432</rr:ExpenseExampleNoRedemptionYear10>
  <rr:ExpenseExampleNoRedemptionYear10 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="USD">859</rr:ExpenseExampleNoRedemptionYear10>
  <rr:ExpenseExampleNoRedemptionYear10 decimals="INF" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="USD">1283</rr:ExpenseExampleNoRedemptionYear10>
  <rr:AnnualReturn2002 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">-0.2238</rr:AnnualReturn2002>
  <rr:AnnualReturn2003 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.2807</rr:AnnualReturn2003>
  <rr:AnnualReturn2004 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.1068</rr:AnnualReturn2004>
  <rr:AnnualReturn2005 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.0475</rr:AnnualReturn2005>
  <rr:AnnualReturn2006 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.1541</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.0514</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">-0.3702</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.2626</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.1494</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.0198</rr:AnnualReturn2011>
  <rr:YearToDateReturnLabel contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member">The Fund's IS class total return for the nine-month period from January 1, 2012 to September 30, 2012</rr:YearToDateReturnLabel>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member">2012-09-30</rr:BarChartYearToDateReturnDate>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.1599</rr:BarChartYearToDateReturn>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member">highest quarterly return</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.1575</rr:BarChartHighestQuarterlyReturn>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member">lowest quarterly return</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">-0.2196</rr:BarChartLowestQuarterlyReturn>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">-0.0019</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0.0114</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.0198</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributions_MemberS000009097_MemberC000024710_Member" unitRef="pure">0.009</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributionsAndSales_MemberS000009097_MemberC000024710_Member" unitRef="pure">0.015</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0.0159</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 id="Item_11" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberStandardAndPoorsFiveHundredIndex_Member" unitRef="pure">0.0211</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">-0.0148</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">-0.0117</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">-0.004</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributions_MemberS000009097_MemberC000024710_Member" unitRef="pure">-0.0244</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributionsAndSales_MemberS000009097_MemberC000024710_Member" unitRef="pure">-0.0076</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">-0.0071</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 id="Item_12" decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberStandardAndPoorsFiveHundredIndex_Member" unitRef="pure">-0.0025</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024708_Member" unitRef="pure">0.0162</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024709_Member" unitRef="pure">0.0192</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024710_Member" unitRef="pure">0.0269</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributions_MemberS000009097_MemberC000024710_Member" unitRef="pure">0.0133</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_01Jan2012_31Dec2012AfterTaxesOnDistributionsAndSales_MemberS000009097_MemberC000024710_Member" unitRef="pure">0.0203</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_01Jan2012_31Dec2012S000009097_MemberC000024711_Member" unitRef="pure">0.0238</rr:AverageAnnualReturnYear10>
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