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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading American Beacon Retirement Income and Appreciation Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund’s investment objective is income and capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales discounts if you and your eligible family members invest, or agree to invest in the future, at least $50,000 in the A Class shares of the American Beacon Funds. More information about these and other discounts are available from your financial professional and in “Choosing Your Share Class” on page 101 of the Prospectus and “Additional Purchase and Sale Information for A Class Shares” on page 78 of the statement of additional information.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2014-02-28
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
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 42% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 42.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales discounts if you and your eligible family members invest, or agree to invest in the future, at least $50,000 in the A Class shares of the American Beacon Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Fund's Financial Highlights table, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This 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’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Assuming no redemption of shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, approximately 75% of the Fund’s total assets are invested in fixed-income securities considered by the Manager or sub-advisor to be investment grade at the time of purchase. These securities may include obligations of the U.S. Government, its agencies and instrumentalities, including government-sponsored enterprises (some of which are not backed by the full faith and credit of the U.S. Government); corporate debt securities,  master demand notes,  medium-term notes, funding agreements, mortgage-backed securities, asset-backed securities  and other debt securities (collectively referred to as “investment grade fixed-income securities”). If an investment held by the Fund is downgraded below investment grade, the Manager or sub-advisor will take action that they believe to be advantageous to the Fund. In an attempt to enhance the return of the Fund beyond the income offered by investment grade fixed-income securities, the Fund’s remaining total assets are invested in convertible and non-convertible debt obligations without regard to credit quality, as well as equity securities. The Fund seeks capital appreciation by investing in debt securities and convertible and equity securities of corporate issuers whose relative value is expected to increase over time.

The Manager currently allocates the Fund’s assets between itself and a sub-advisor. The Manager makes investment decisions regarding a portion of the Fund’s fixed-income securities. In determining which securities to buy and sell, the Manager employs a top-down fixed-income investment strategy, as follows:

●
Develop an overall investment strategy, including a portfolio duration target, by examining the current trends in the U.S. economy.

●
Set desired portfolio maturity structure by comparing the differences between corporate and U.S. Government securities of similar duration to judge their potential for optimal return in accordance with the target duration benchmark.

●
Determine the weightings of each security type by analyzing the difference in yield spreads between corporate and U.S. Government securities.

●
Select specific debt securities within each security type.

●
Review and monitor portfolio composition for changes in credit, risk-return profile and comparisons with benchmarks.

Under normal circumstances, the Manager seeks to maintain a weighted average duration of three to seven years in the investment grade fixed-income portion of the Fund. A duration of “one year” means that a security’s price would be expected to decrease by approximately 1% with a 1% increase in interest rates.

The sub-advisor invests in convertible securities but may invest up to 60% of its portion of the Fund’s total assets in non-convertible fixed-income securities. The sub-advisor may invest in investment grade fixed-income securities and securities rated below-investment grade or not rated, commonly referred to as “high-yield bonds” or “junk bonds.” The average term to maturity of the fixed-income securities held in the portion of the Fund’s portfolio managed by the sub-advisor will typically range from three to ten years.

The sub-advisor also may invest up to 40% of its portion of the Fund’s total asset in non-convertible equity securities, common stocks, preferred stocks, American Depositary Receipts (“ADRs”) and U.S. dollar-denominated foreign stocks traded on U.S. exchanges (collectively referred to as “stocks”). Historically, the sub-advisor’s investment process has led it to invest primarily in convertible securities of small- to mid-capitalization companies that, in its opinion, provide opportunities for long-term capital appreciation. However, the Fund may invest in issuers of all market capitalizations.

In selecting securities, the sub-advisor may take into consideration such quantitative factors as an issuer’s present and potential liquidity, profitability, internal capability to generate funds, debt/equity ratio and debt servicing capabilities, and such qualitative factors as an assessment of management, industry characteristics, accounting methodology, and foreign business exposure. The sub-advisor utilizes credit ratings by any rating organizations as preliminary indicators of investment quality, in addition to its own credit research and analysis.

The Fund may also invest cash balances in other investment companies to gain market exposure on cash balances or reduce market exposure in anticipation of liquidity needs.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
There is no assurance that the Fund will achieve its investment objective and you could lose part or all of your investment in the Fund. The Fund is not designed for investors who need an assured level of income and is intended to be a long-term investment. The Fund is not a complete investment program and may not be appropriate for all investors. Investors should carefully consider their own investment goals and risk tolerance before investing in the Fund. The principal risks of investing in the Fund are:

Convertible Securities Risk

The value of a convertible security is influenced by both the yield of non-convertible securities of comparable issuers and by the value of the underlying common stock. The investment value of a convertible is strictly based on its yield and tends to decline as interest rates increase. Convertible securities may also be subject to credit risk, market risk and interest rate risk.

Credit Risk

The Fund is subject to the risk that the issuer of a bond will fail to make timely payment of interest or principal. A decline in an issuer’s credit rating can cause the price of its bonds to go down.  For the portion of Fund assets invested in lower-quality debt securities, this risk will be substantial.

Equity Investments Risk

Equity securities generally are subject to market risk. The Fund’s investments in equity securities may include common stocks, preferred stocks, ADRs, and U.S. dollar-denominated foreign stocks traded on U.S. exchanges. Such investments may expose the Fund to additional risks.

Common stock generally is subordinate to preferred stock upon the liquidation or bankruptcy of the issuing company. Preferred stock is sensitive to movements in interest rates. Investments in ADRs and U.S. dollar-denominated foreign stocks traded on U.S. exchanges are subject to certain of the risks associated with investing directly in foreign securities.

Foreign Exposure Risk

The Fund may invest in securities issued by foreign companies through ADRs and U.S. dollar-denominated foreign stocks traded on U.S. exchanges. These securities are subject to many of the risks inherent in investing in foreign securities, including, but not limited to, currency fluctuations and political and financial instability in the home country of a particular ADR or foreign stock. Non-U.S. investments carry potential risks not associated with U.S. investments. Such risks include, but are not limited to: (1) currency exchange rate fluctuations, (2) political and financial instability, (3) less liquidity and greater volatility, (4) lack of uniform accounting, auditing and financial reporting standards, (5) increased price volatility, and (6) less government regulation and supervision of foreign stock exchanges, brokers and listed companies.

Government-Sponsored Enterprises Risk

Securities held by the Fund that are issued by government-sponsored enterprises, such as the Federal National Mortgage Association (“Fannie Mae”), the Federal Home Loan Mortgage Corporation (“Freddie Mac”), Federal Farm Credit Banks, and the Tennessee Valley Authority are not guaranteed by the U.S. Treasury and are not backed by the full faith and credit of the U.S. Government. They are also subject to credit risk and interest rate risk.

Interest Rate Risk

The Fund is subject to the risk that the market value of the bonds it holds will decline due to rising interest rates. When interest rates rise, the prices of most bonds go down. The price of a bond is also affected by its maturity. Bonds with longer maturities generally have greater sensitivity to changes in interest rates.

Investment Risk

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your shares of the Fund, they could be worth less than what you paid for them. Therefore, you may lose money by investing in the Fund.

Issuer Risk

The value of a security may decline for a number of reasons which directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services, as well as the historical and prospective earnings of the issuer and the value of its assets.

Market Events Risk

Turbulence in financial markets and reduced liquidity in equity, credit and fixed-income markets may negatively affect many issuers worldwide which could adversely affect the Fund.

Market Risk

Market risks, including political, regulatory, market and economic developments, and developments that impact specific economic sectors, industries or segments of the market, can affect the value of the Fund’s shares. The Fund’s equity investments are subject to stock market risk, which involves the possibility that the value of the Fund’s investments in stocks will decline due to drops in the stock market. The Fund’s fixed-income investments are subject to the risk that the lack of liquidity or other adverse credit market conditions may hamper the Fund’s ability to purchase and sell the securities. From time to time, certain investments held by the Fund may have limited marketability and may be difficult to sell at favorable times or prices. If the Fund is forced to sell such holdings to meet redemption requests or other cash needs, the Fund may have to sell them at a loss.

Other Investment Companies Risk

The Fund may invest in shares of other registered investment companies, including open-end funds, exchange-traded funds (“ETFs”) and money market funds. To the extent that the Fund invests in shares of other registered investment companies, you will indirectly bear fees and expenses charged by the underlying funds in addition to the Fund’s direct fees and expenses and will be subject to the risks associated with investments in those funds.

Prepayment and Extension Risk

The Fund’s investments in asset-backed and mortgage-backed securities are subject to the risk that the principal amount of the underlying collateral may be repaid prior to the bond’s maturity date. If this occurs, no additional interest will be paid on the investment and the Fund may have to invest at a lower rate. Conversely, a decrease in expected prepayments may result in the extension of a security’s effective maturity and a decline in its price.

Securities Selection Risk

Securities selected by the Manager or a sub-advisor for the Fund may not perform to expectations. This could result in the Fund’s underperformance compared to other funds with similar investment objectives.

U.S. Government Securities Risk

A security backed by the U.S. Treasury or the full faith and credit of the United States is guaranteed only as to the timely payment of interest and principal when held to maturity. The market prices for such securities are not guaranteed and will fluctuate. They are also subject to credit risk and interest rate risk.
Risk Lose Money [Text] rr_RiskLoseMoney There is no assurance that the Fund will achieve its investment objective and you could lose part or all of your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Fund Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide an indication of risk by showing how the Fund’s performance has varied from year to year. The table shows how the Fund’s performance compares to the Barclays Capital U.S. Aggregate Bond Index, which is the Fund’s primary benchmark. The table also shows how the Fund’s returns compare to the BofA Merrill Lynch All U.S. Convertibles Index, which tracks the performance of domestic securities of all quality grades that are convertible into U.S. dollar-denominated common stock, ADRs or cash equivalents. The Retirement Income and Appreciation Composite Index is composed of the Linked Barclays Capital U.S. Aggregate Bond Index (75%) and the BofA Merrill Lynch All U.S. Convertibles Index (25%) to reflect the Fund’s allocation of its assets between fixed-income securities and convertible securities. The Lipper Intermediate Investment Grade Debt Funds Index shows how the Fund’s performance compares to a composite of mutual funds with similar investment objectives.

The chart and the table below show the performance of the Fund’s Investor Class shares for all periods. The Fund began operations of Y Class shares on March 1, 2010, A Class shares on May 17, 2010 and C Class shares on September 1, 2010. In the table below, the performance of the Investor Class shares is shown for the Y Class, A Class and C Class shares for all periods prior to the inception of each class. The Investor Class shares class would have had similar returns to the newer classes of shares because the shares are invested in the same portfolio securities. However, because the Investor Class had a different expense structure, its performance was different than the newer classes of shares would have realized in the same period. You may obtain updated performance information on the Fund’s website at www.americanbeaconfunds.com. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Sales charges are not reflected in the bar chart and table below. If those charges were included, returns of A Class shares would be less than those shown.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide an indication of risk by showing how the Fund's performance has varied from year to year.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.americanbeaconfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar year total returns for Investor Class shares
Bar Chart Narrative [Text Block] rr_BarChartNarrativeTextBlock
Total Return for the Calendar Year Ended 12/31 of each Year

Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales charges are not reflected in the bar chart and table below. If those charges were included, returns of A Class shares would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
   
Highest Quarterly Return:
6.61%
(1/1/04 through 12/31/12)
(3rd Quarter 2009)
Lowest Quarterly Return:
-4.19%
(1/1/04 through 12/31/12)
(3rd Quarter 2008)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.61%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.19%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns For the periods ended December 31, 2012
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred If you hold your Fund shares through a tax-deferred arrangement, such as an IRA or a 401(k), the after-tax returns do not apply to your situation.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Investor Class shares; after-tax returns for other share classes will vary.
Barclays Capital U.S. Aggregate Bond Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.21% [1]
5 Years rr_AverageAnnualReturnYear05 5.96% [1]
10 Years rr_AverageAnnualReturnYear10 5.03% [1]
Linked Barclays Capital U.S. Aggregate Bond Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.21% [1]
5 Years rr_AverageAnnualReturnYear05 6.19% [1]
10 Years rr_AverageAnnualReturnYear10 5.95% [1]
BofA Merrill Lynch All U.S. Convertibles Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.96% [1]
5 Years rr_AverageAnnualReturnYear05 4.06% [1]
10 Years rr_AverageAnnualReturnYear10 6.23% [1]
Retirement Income and Appreciation Composite Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.89% [1]
5 Years rr_AverageAnnualReturnYear05 5.73% [1]
10 Years rr_AverageAnnualReturnYear10 5.30% [1]
Lipper Intermediate Investment Grade Debt Funds Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.82% [1]
5 Years rr_AverageAnnualReturnYear05 6.28% [1]
10 Years rr_AverageAnnualReturnYear10 5.08% [1]
Investor Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge load (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.32%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.80%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 1.13% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 115
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 359
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 622
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,374
Annual Return 2003 rr_AnnualReturn2003 3.04%
Annual Return 2004 rr_AnnualReturn2004 1.51%
Annual Return 2005 rr_AnnualReturn2005 1.86%
Annual Return 2006 rr_AnnualReturn2006 5.09%
Annual Return 2007 rr_AnnualReturn2007 5.30%
Annual Return 2008 rr_AnnualReturn2008 3.03%
Annual Return 2009 rr_AnnualReturn2009 5.04%
Annual Return 2010 rr_AnnualReturn2010 2.89%
Annual Return 2011 rr_AnnualReturn2011 0.36%
Annual Return 2012 rr_AnnualReturn2012 7.19%
1 Year rr_AverageAnnualReturnYear01 7.19% [1]
5 Years rr_AverageAnnualReturnYear05 5.22% [1]
10 Years rr_AverageAnnualReturnYear10 4.86% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 2003 [1]
Investor Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.07% [1]
5 Years rr_AverageAnnualReturnYear05 4.10% [1]
10 Years rr_AverageAnnualReturnYear10 3.63% [1]
Investor Class | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.78% [1]
5 Years rr_AverageAnnualReturnYear05 3.85% [1]
10 Years rr_AverageAnnualReturnYear10 3.48% [1]
Y Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge load (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.32%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.55%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 0.88% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%)
Total annual fund operating expenses after expense reduction and reimbursement rr_NetExpensesOverAssets 0.81% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 83
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 274
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 481
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,078
1 Year rr_AverageAnnualReturnYear01 7.41% [1]
5 Years rr_AverageAnnualReturnYear05 5.34% [1]
10 Years rr_AverageAnnualReturnYear10 4.93% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2010 [1]
A Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
Maximum deferred sales charge load (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 0.50% [4]
Management fees rr_ManagementFeesOverAssets 0.32%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.71%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 1.29% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.14%)
Total annual fund operating expenses after expense reduction and reimbursement rr_NetExpensesOverAssets 1.15% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 364
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 635
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 926
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,756
1 Year rr_AverageAnnualReturnYear01 7.10% [1]
5 Years rr_AverageAnnualReturnYear05 5.20% [1]
10 Years rr_AverageAnnualReturnYear10 4.85% [1]
Inception Date rr_AverageAnnualReturnInceptionDate May 17, 2010 [1]
C Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge load (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.32%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.72%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 2.05% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%)
Total annual fund operating expenses after expense reduction and reimbursement rr_NetExpensesOverAssets 1.97% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 300
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 635
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,096
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,373
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 200
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 635
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,096
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,373
1 Year rr_AverageAnnualReturnYear01 6.08% [1]
5 Years rr_AverageAnnualReturnYear05 4.76% [1]
10 Years rr_AverageAnnualReturnYear10 4.62% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 01, 2010 [1]
[1] After-tax returns are shown only for Investor Class shares; after-tax returns for other share classes will vary. 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. If you hold your Fund shares through a tax-deferred arrangement, such as an IRA or a 401(k), the after-tax returns do not apply to your situation.
[2] The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Fund's Financial Highlights table, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
[3] The Manager has contractually agreed to reduce and/or reimburse the A Class, C Class and Y Class of the Fund for Other Expenses, as applicable, through February 28, 2014 to the extent that Total Annual Fund Operating Expenses exceed 1.14% for the A Class, 1.96% for the C Class and 0.80% for the Y Class (excluding taxes, brokerage commissions, acquired fund fees and expenses and other extraordinary expenses such as litigation). The contractual expense arrangement can be changed by approval of a majority of the Fund's Board of Trustees. The Manager can be reimbursed by the Fund for any contractual or voluntary fee reductions or expense reimbursements if reimbursement to the Manager (a) occurs within three years after the Manager's own reduction or reimbursement and (b) does not cause the Total Annual Fund Operating Expenses of a class to exceed the percentage limit contractually agreed.
[4] A contingent deferred sales charge ("CDSC") of 0.50% will be charged on certain purchases of $250,000 or more that are redeemed in whole or part within 12 months of purchase.