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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000809593
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

American Beacon SiM High Yield Opportunities FundSM
Objective [Heading] rr_ObjectiveHeading

Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund's investment objective is to seek high current income and, secondarily, 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 is available from your financial professional and on page 40 of under “Choosing Your Share Class” in the prospectus and on page 61 under “Additional Purchase and Sale Information for A Class Shares” in 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 2014-12-31
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 65% of the average value of the portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 65.00%
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
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

This Fund seeks to maximize current income by investing in a diversified portfolio of fixed income securities that are generally rated below investment grade (such as Ba or lower by Moody's Investors Service, Inc. or BB or lower by Standard & Poor's Ratings Services or Fitch, Inc.) or deemed to be below investment grade by Strategic Income Management, LLC (“SiM”). These types of securities are commonly referred to as “high yield” or “junk” bonds.”

 

The Fund seeks its investment objective by investing, under normal circumstances, at least 80% of the Fund's net assets in non-investment grade securities and/or financial instruments that provide exposure to non-investment grade securities. These financial instruments include options and futures contracts (including options and futures contracts on stock indices and currencies), forward contracts (including currency forward contracts), swap agreements and structured notes whose underlying assets are rated below investment grade.

 

The non-investment grade securities in which the Fund may invest include: corporate bonds, convertible securities, preferred stock, bank and senior loans, emerging market debt, municipal securities, asset-backed and mortgage-backed securities, and Rule 144A securities. The Fund may invest in securities of foreign issuers, including those in emerging markets. The Fund has no limitations regarding the maturities of the debt securities it can buy, the market capitalization of the issuers of those securities or whether the securities are rated.

 

The Fund's investments in derivative instruments include futures contracts, forward contracts, and swaps. The Fund may use these derivative instruments to enhance total return, to hedge against fluctuations in securities prices, interest rates or currency exchange rates, to manage the effective duration of its portfolio, and to manage certain investment risks or as a substitute for purchase or sale of the underlying currencies or securities.

 

The Fund may have exposure to foreign currencies for investment or hedging purposes by purchasing or selling forward currency exchange contracts in non-U.S. or emerging market currencies, and non-U.S. currency futures contracts. The Fund may also make direct investments in non-U.S. currencies and in securities denominated in non-U.S. currencies. Investments in currencies and currency hedging are established to extract value or reduce risk.

 

The remainder of the Fund's assets may be invested in any other securities that SiM believes are consistent with the Fund's objective, including investment grade fixed-income securities, U.S. government securities, common stock, American Depositary Receipts (“ADRs”) and Global Depositary Receipts (“GDRs”), real estate investment trusts (“REITs”), loan participation interests, and income-producing equity securities, such as master limited partnerships (“MLPs”), income trusts and income deposit securities (“IDSs”).

 

In selecting investments for the Fund, SiM uses an approach that combines different aspects of top down and bottom up analysis. As part of its top down analysis, SiM utilizes a core philosophy to identify positive long term trends. SiM then invests in sectors, industries and companies that will benefit from these trends. Concurrent with this core philosophy, SiM's management seeks to take advantage of market volatility by analyzing and potentially investing in sectors, industries and companies undergoing a change in dynamics that has not been fully recognized by the market. Market volatility continually provides opportunities to capture value from these types of situations. Once potential investment opportunities are identified, SiM utilizes bottom up research to assess the fundamental strengths and weaknesses of each individual company and the best risk/reward security is chosen for inclusion in the portfolio.

SiM may reduce or sell the Fund's portfolio securities for a variety of reasons, including if, in SiM's opinion, a security's value becomes fully recognized or there is a reassessment of the fundamental attributes of the security.

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 money by investing in the Fund. The Fund is designed primarily for investors seeking current income from a fund that typically invests mainly in a variety of domestic and foreign high-yield, high-risk debt securities. Those investors should be willing to assume the credit risks of a fund that typically invests a significant amount of its assets in below investment-grade debt securities and the price changes in those securities that can occur when interest rates change. The Fund is not designed for investors who need an assured level of current income. The Fund 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:

 

Asset-Backed and Mortgage Related Securities Risk

 

Investments in asset-backed and mortgage related securities are subject to market risks for fixed-income securities which includes, but are not limited to, interest rate risk, extension risk and prepayment risk.

 

Bank Loans and Senior Loan Risk

 

Bank loans and senior loans are subject to credit risk, interest rate risk and liquidity risk. In addition, bank loans and senior loans are subject to the risk that the value of the collateral, if any, securing a loan may decline, be insufficient to meet the obligations of the borrower, or be difficult to liquidate. In the event of a default, the Fund may have difficulty collecting on any collateral and would not have the ability to collect on any collateral for an uncollateralized loan.

 

Credit Risk

 

The Fund is subject to the risk that the issuer or guarantor of a debt security, or the counterparty to a derivatives contract or a loan will fail to make timely payment of interest or principal or otherwise honor its obligations. A decline in the credit rating of an individual security held by the Fund may have an adverse impact on its price. Rating agencies might not always change their credit rating on an issuer or security in a timely manner to reflect events that could affect the issuer's ability to make timely payments on its obligations. Credit risk is typically greater for securities with ratings that are below investment grade. Since the Fund can invest significantly in lower-quality debt securities considered speculative in nature, this risk will be substantial.

 

Currency Risk

 

The Fund may have exposure to foreign currencies by purchasing or selling forward currency exchange contracts in non-U.S. currencies, non-U.S. currency futures contracts, options on non-U.S. currencies and non-U.S. currency futures, swaps for cross-currency investments, direct investments in non-U.S. currencies and in securities denominated in non-U.S. currencies. Foreign currencies may decline in value relative to the U.S. dollar and other currencies and thereby affect the Fund's investments in foreign (non-U.S.) currencies or in securities that trade in, and receive revenues in, or in derivatives that provide exposure to, foreign (non-U.S.) currencies. Not all forward contracts require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty.

 

Derivatives Risk

 

Derivatives may involve significant risk. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund's initial investment. Derivatives may be illiquid and may be more volatile than other types of investments. The Fund may buy derivatives not traded on an exchange which may be subject to heightened liquidity and valuation risk. Derivative investments can increase portfolio turnover and transaction costs. Over-the-counter derivatives are subject to counterparty credit risk, which is the risk that a counterparty to a derivative instrument becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties. As a result the Fund may obtain no recovery of its investment or may only obtain a limited recovery, and any recovery may be delayed. Not all derivative transactions require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. In addition, the Fund's investments in derivatives are subject to the following risks.

•       Futures and Forward Contracts.  There may be an imperfect correlation between the changes in market value of the securities held by the Fund and the prices of futures contracts. There may not be a liquid market for the futures contracts. Forward currency transactions include the risks associated with fluctuations in currency.

 

 

•         Hedging Risk.  If the Fund uses a hedging instrument at the wrong time or judges the market conditions incorrectly or the hedged instrument does not correlate to the risk sought to be hedged, the hedge might be unsuccessful, reduce the Fund's return, or create a loss.

 

 

•         Options.  There may be an imperfect correlation between the prices of options and movements in the price of the securities (or indices) hedge or used for cover which may cause a given hedge not to achieve its objective.

 

 

•         Structured Notes.  Structured notes are subject to interest rate risk and credit risk. The price of structured notes may be very volatile and they may have a limited trading market, making it difficult to value them or sell them at an acceptable price.

•       Swap Agreements.  Swaps are subject to counterparty risk. Credit default swaps, including credit default swaps on baskets of securities (such as the CDX indices), are subject to credit risk on the underlying investment. Interest rate swaps are subject to interest rate and credit risk. Total return swaps may be subject to credit risk and market risk.

 

 

 

Equity Investments Risk

 

Equity securities generally are subject to market risk. The Fund's investments in equity securities may include preferred stocks, common stocks, securities convertible into or exchangeable for common stocks, REITs, and MLPs. Preferred stocks and convertible securities are sensitive to movements in interest rates. In addition, convertible securities are subject to the risk that the credit standing of the issuer may have an effect on the convertible securities' investment value. Depositary receipts are subject to certain of the risks associated with investing directly in foreign securities. Common stocks are subject to market risk, their prices may be volatile at times, and rank below preferred stocks and bonds in claims for dividends or assets of a company in a liquidation or bankruptcy. Investments in REITs are subject to the risks associated with investing in the real estate industry such as adverse developments affecting the real estate industry and real property values. To the extent the Fund invests in securities of small- or mid-capitalization companies, such investments involve greater risk and the possibility of greater price volatility than investing in larger capitalization and more established companies, since small and medium-sized companies may have limited operating history, product lines, and financial resources. Holders of units in MLPs have more limited rights and may be required to sell their common units at an undesirable time or price. The Fund's investments in MLPs may also make it more difficult for the Fund to meet the requirements necessary to qualify as a regulated investment company under the Internal Revenue Code of 1986, as amended.

 

Emerging Markets Risk

 

When investing in emerging markets, the risks of investing in foreign securities discussed below are heightened. Emerging markets have unique risks that are greater than or in addition to investing in developed markets because emerging markets are generally smaller, less developed, less liquid and more volatile than the securities markets of the U.S. and other developed markets. There are also risks of: greater political uncertainties; an economy's dependence on revenues from particular commodities or on international aid or development assistance; currency transfer restrictions; a limited number of potential buyers for such securities; and delays and disruptions in securities settlement procedures. In addition, there may be less information available to make investment decisions and more volatile rates of return.

 

Foreign Currency Forward Risk

 

Foreign currency forward contracts are derivative instruments pursuant to a contract with a counterparty to pay a fixed price for an agreed amount of securities or other underlying assets at an agreed date or to buy or sell a specific currency at a future date at a price set at the time of the contract. The use of foreign currency forward contracts may expose the Fund to additional risks that it would not be subject to if it invested directly in the securities underlying the foreign currency forward contract. Not all forward contracts require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. Foreign currency forward transactions include risks associated with fluctuations in foreign currency.

 

Foreign Investing Risk

 

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, (6) less government regulation and supervision of foreign stock exchanges, brokers and listed companies, and (7) delays in transaction settlement in some foreign markets.

 

High Yield Securities Risk

 

Investing in high yield, below investment-grade securities generally involves significantly greater risks of loss of your money than an investment in investment-grade securities. Compared with issuers of investment grade securities, high yield securities are more likely to encounter financial difficulties and to be materially affected by these difficulties. Rising interest rates may compound these difficulties and reduce an issuer's ability to repay principal and interest obligations. Issuers of lower-rated securities also have a greater risk of default or bankruptcy.

 

Interest Rate Risk

 

The Fund is subject to the risk that the market value of fixed income securities or derivatives it holds, particularly mortgage backed and other asset backed securities, will decline due to rising interest rates. When interest rates rise, the prices of most fixed income securities go down. The prices of fixed income securities or derivatives are also affected by their duration. Fixed income securities or derivatives with longer durations 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.

 

Leveraging Risk

 

The Fund's use of futures, forward contracts, swaps, structured notes, other derivative instruments and selling securities short will have the economic effect of financial leverage. Financial leverage magnifies the exposure to the swings in prices of an asset or class of assets underlying a derivative instrument and results in increased volatility, which means that the Fund will have the potential for greater losses than if the Fund does not use the derivative instruments that have a leveraging effect. Leveraging tends to magnify, sometimes significantly, the effect of any increase or decrease in the Fund's exposure to an asset or class of assets and may cause the Fund's net asset value to be volatile.

 

Liquidity Risk

 

From time to time, certain investments held by the Fund may have limited marketability or have restrictions on sale, and may be difficult to sell at favorable times or prices. The Fund could lose money if it is unable to dispose of an investment at a time that is most beneficial to the Fund.

 

Loan Participation Interests Risk

 

Loan participation interests may be collateralized or uncollateralized and are subject to the credit risk of the servicing agent as well as the credit risk of the borrower. If the Fund purchases a participation interest, it may be only able to enforce its rights through the lender.

 

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 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 debt securities. 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 any of the many individual country or global financial markets. 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.

 

Municipal Securities Risk

 

Municipal securities are subject to credit risk where a municipal issuer of a security might not make interest and principal payments on a security as they become due. A downgrade in the issuer's or security's credit rating can reduce the market value of the security. Municipal securities are also subject to interest rate risk.

 

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.

 

Restricted Securities Risk

 

Certain securities held by the Fund may be restricted by federal law from resale to the public. Restricted securities may be less liquid than other investments because, at times, such securities cannot be readily sold in broad public markets and the Fund might be unable to dispose of such securities promptly or at reasonable prices. A restricted security that was liquid at the time of purchase may subsequently become illiquid.

 

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.

 

Unrated Securities Risk

 

Some unrated securities may not have an active trading market or may be difficult to value, which means the Fund might have difficulty selling them promptly at an acceptable price.

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 money by investing 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 comparing the Fund's performance with a broad measure of market performance. The table shows how the Fund's performance compares to a broad-based market index and the Lipper® High Current Yield Bonds Index, a composite of mutual funds comparable to the Fund. The bar chart does not reflect any charges, which would reduce your return. The chart and the table below show the performance of the Fund's Investor Class shares for all periods. The Fund began offering all shares classes on February 14, 2011. 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.

Performance Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide an indication of risk by comparing the Fund’s performance with a broad measure of market performance.
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 Total Return for the Calendar Year Ended 12/31/12
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The calendar year-to-date total return as of
           September 30, 2013 was 3.89%

    Highest Quarterly Return:                                                                                                6.99%

(2/14/11 through 12/31/12)                                                                                (1st Quarter 2012)

Lowest Quarterly Return:                                                                                                -6.55%

(2/14/11 through 12/31/12)                                                                               (3rd Quarter 2011)
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.89%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.99%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return: -6.55%
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.55%)
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.
Lipper High Current Yield Bond Funds Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.40% [1]
Since Inception rr_AverageAnnualReturnSinceInception 7.69% [1]
Merrill Lynch/Bank of America US High Yield Master II Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.58% [1]
Since Inception rr_AverageAnnualReturnSinceInception 8.78% [1]
A Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 0.50% [2]
Redemption fee (as a percentage of amount redeemed; applies to the proceeds of shares redeemed within 90 days of purchase) rr_RedemptionFeeOverRedemption 2.00%
Management fees rr_ManagementFeesOverAssets 0.48%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.68%
Total annual fund operating expenses rr_ExpensesOverAssets 1.41%
Expense Reduction and Reimbursement ck0000809593_FeeWaiverOrReimbursementAndRecoupmentOverAssets 0.19%
Total annual fund operating expenses after expense reduction and reimbursement rr_NetExpensesOverAssets 1.34% [3]
1 year rr_ExpenseExampleYear01 605
3 years rr_ExpenseExampleYear03 893
5 years rr_ExpenseExampleYear05 1,203
10 years rr_ExpenseExampleYear10 2,080
1 Year rr_AverageAnnualReturnYear01 14.27% [1]
Since Inception rr_AverageAnnualReturnSinceInception 6.63% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2011 [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 (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00%
Redemption fee (as a percentage of amount redeemed; applies to the proceeds of shares redeemed within 90 days of purchase) rr_RedemptionFeeOverRedemption 2.00%
Management fees rr_ManagementFeesOverAssets 0.48%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.67%
Total annual fund operating expenses rr_ExpensesOverAssets 2.15%
Expense Reduction and Reimbursement ck0000809593_FeeWaiverOrReimbursementAndRecoupmentOverAssets 0.06%
Total annual fund operating expenses after expense reduction and reimbursement rr_NetExpensesOverAssets 2.09% [3]
1 year rr_ExpenseExampleYear01 312
3 years rr_ExpenseExampleYear03 667
5 years rr_ExpenseExampleYear05 1,148
10 years rr_ExpenseExampleYear10 2,477
1 year rr_ExpenseExampleNoRedemptionYear01 212
3 years rr_ExpenseExampleNoRedemptionYear03 667
5 years rr_ExpenseExampleNoRedemptionYear05 1,148
10 years rr_ExpenseExampleNoRedemptionYear10 2,477
1 Year rr_AverageAnnualReturnYear01 18.13% [1]
Since Inception rr_AverageAnnualReturnSinceInception 8.74% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2011 [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 (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Redemption fee (as a percentage of amount redeemed; applies to the proceeds of shares redeemed within 90 days of purchase) rr_RedemptionFeeOverRedemption 2.00%
Management fees rr_ManagementFeesOverAssets 0.48%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.51%
Total annual fund operating expenses rr_ExpensesOverAssets 0.99%
Expense Reduction and Reimbursement ck0000809593_FeeWaiverOrReimbursementAndRecoupmentOverAssets 0.05%
Total annual fund operating expenses after expense reduction and reimbursement rr_NetExpensesOverAssets 0.94% [3]
1 year rr_ExpenseExampleYear01 96
3 years rr_ExpenseExampleYear03 310
5 years rr_ExpenseExampleYear05 542
10 years rr_ExpenseExampleYear10 1,208
1 Year rr_AverageAnnualReturnYear01 20.52% [1]
Since Inception rr_AverageAnnualReturnSinceInception 9.85% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2011 [1]
Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Redemption fee (as a percentage of amount redeemed; applies to the proceeds of shares redeemed within 90 days of purchase) rr_RedemptionFeeOverRedemption 2.00%
Management fees rr_ManagementFeesOverAssets 0.48%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.45%
Total annual fund operating expenses rr_ExpensesOverAssets 0.93%
Expense Reduction and Reimbursement ck0000809593_FeeWaiverOrReimbursementAndRecoupmentOverAssets 0.09%
Total annual fund operating expenses after expense reduction and reimbursement rr_NetExpensesOverAssets 0.84% [3]
1 year rr_ExpenseExampleYear01 86
3 years rr_ExpenseExampleYear03 288
5 years rr_ExpenseExampleYear05 506
10 years rr_ExpenseExampleYear10 1,136
1 Year rr_AverageAnnualReturnYear01 20.64% [1]
Since Inception rr_AverageAnnualReturnSinceInception 10.04% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2011 [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 (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Redemption fee (as a percentage of amount redeemed; applies to the proceeds of shares redeemed within 90 days of purchase) rr_RedemptionFeeOverRedemption 2.00%
Management fees rr_ManagementFeesOverAssets 0.48%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.67%
Total annual fund operating expenses rr_ExpensesOverAssets 1.15%
Expense Reduction and Reimbursement ck0000809593_FeeWaiverOrReimbursementAndRecoupmentOverAssets (0.02%)
Total annual fund operating expenses after expense reduction and reimbursement rr_NetExpensesOverAssets 1.17% [3]
1 year rr_ExpenseExampleYear01 119
3 years rr_ExpenseExampleYear03 367
5 years rr_ExpenseExampleYear05 634
10 years rr_ExpenseExampleYear10 $ 1,400
Annual Return 2012 rr_AnnualReturn2012 20.15%
1 Year rr_AverageAnnualReturnYear01 20.15% [1]
Since Inception rr_AverageAnnualReturnSinceInception 9.43% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2011 [1]
Investor Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.94% [1]
Since Inception rr_AverageAnnualReturnSinceInception 6.66% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2011 [1]
Investor Class | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 13.01% [1]
Since Inception rr_AverageAnnualReturnSinceInception 6.36% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 14, 2011 [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] A contingent deferred sales charge ('CDSC') of 0.50% will be charged on certain purchases of $1,000,000 or more of A Class shares that are redeemed in whole or part within 18 months of purchase.
[3] The Manager has contractually agreed to reduce and/or reimburse the A Class, C Class, Y Class and Institutional Class of the Fund for Distribution Fees and Other Expenses, as applicable, through December 31, 2014 to the extent that Total Annual Fund Operating Expenses exceed 1.34% for the A Class, 2.09% for the C Class, 0.94% for the Y Class, and 0.84% for the Institutional 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.