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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 Balanced FundSM
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 is available from your financial professional and in “Choosing Your Share Class” on page 86 of the Prospectus and “Additional Purchase and Sale Information for A Class Shares” on page 91 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)

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 56% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 56.00%
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, between 50% and 70% of the Fund's total assets are invested in equity securities and between 30% and 50% of the Fund's total assets are invested in debt securities.

 

The Fund's equity investments may include common stocks, preferred stocks, securities convertible into common stocks, real estate investment trusts (“REITs”), American Depositary Receipts (“ADRs”) and U.S. dollar-denominated foreign stocks traded on U.S. exchanges (collectively referred to as “stocks”). The Fund may invest in companies of all market capitalizations.

 

The Manager allocates the assets of the Fund among different sub-advisors. The Manager believes that this strategy may help the Fund outperform other investment styles over the longer term while reducing volatility and downside risk.

 

The Fund's sub-advisors select stocks that, in their opinion, have most or all of the following characteristics (relative to the S&P 500® Index):

       ‣ above-average earnings growth potential,

 

       ‣ below-average price to earnings ratio,

 

       ‣ below-average price to book value ratio, and

 

       ‣ above-average dividend yields.

 

Each of the Fund's sub-advisors determines the earnings growth prospects of companies based upon a combination of internal and external research using fundamental analysis and considering changing economic trends. The decision to sell a stock is typically based on the belief that the company is no longer considered undervalued or shows deteriorating fundamentals, or that better investment opportunities exist in other stocks.

 

The Fund's debt securities may include: obligations of the U.S. Government, its agencies and instrumentalities, including U.S. Government-sponsored enterprises (some of which are not backed by the full faith and credit of the U.S. Government); U.S. and U.S. dollar-denominated foreign corporate debt securities, such as notes and bonds, mortgage-backed securities; asset-backed securities; master-demand notes and other debt securities. The Fund will only buy debt securities that are deemed by the Manager or sub-advisors, as applicable, to be investment grade at the time of the purchase. If an investment held by the Fund is downgraded below investment grade, the Manager or sub-advisors, as applicable will take action that they believe to be advantageous to the Fund. The Fund has no limitations regarding the duration of the debt securities it can buy.

 

In determining which debt securities to buy and sell, the Manager and the sub-advisors generally use a “top-down” or “bottom-up” investment strategy, or a combination of both strategies. The top-down fixed-income investment strategy is implemented 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 duration 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.

 

The bottom-up fixed-income investment strategy is implemented as follows:

•          Search for eligible securities with a yield to maturity advantage versus a U.S. Government security with a similar duration.

 

•          Evaluate credit quality of the securities.

 

•          Perform an analysis of the expected price volatility of the securities to changes in interest rates by examining actual price volatility between U.S. Government and non-U.S. Government securities.

 

The Fund may invest cash balances in other investment companies and may purchase and sell futures contracts 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 current 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:

 

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 include, but are not limited to, interest rate risk, extension risk and prepayment risk.

 

Credit Risk

 

The Fund is subject to the risk that the issuer or guarantor of a debt security will fail to make timely payment of interest or principal. 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.

 

Equity Investments Risk

 

Equity securities are subject to market risk. The Fund's investments in equity securities may include U.S. and non-U.S. common stocks, preferred stocks, securities convertible into or exchangeable for common stocks, REITs, 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 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. 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. 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.

 

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. ADRs 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. The Fund may also invest in U.S. dollar-denominated bonds issued by foreign companies or foreign governments. 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.

 

Futures Contracts Risk

 

Futures contracts are derivative investments 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. The use of such derivative instruments may expose the Fund to additional risks that it would not be subject to if it invested directly in the securities underlying those derivatives. Futures contracts may experience dramatic price changes (losses) and imperfect correlation between the price of the contract and the underlying security or index which will increase the volatility of the Fund and may involve a small investment of cash (the amount of initial and variation margin) relative to the magnitude of the risk assumed (the potential increase or decrease in the price of the futures contract). There can be no assurance that any strategy used will succeed.

 

There may not be a liquid secondary market for the futures contract. When the Fund purchases or sells a futures contract, it is subject to daily variation margin calls that could be substantial in the event of adverse price movements. If the Fund has insufficient cash to meet daily variation margin requirements, it might need to sell securities at a time when such sales are disadvantageous.

 

Government-Sponsored Enterprises Risk

 

Securities held by the Fund that are issued by government-sponsored enterprises, such as the Federal Home Loan Bank (“FHLB”), 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 fixed income securities it holds will decline due to rising interest rates. When interest rates rise, the prices of most fixed income securities go down. As of the date of this Prospectus, interest rates are at or near historic lows, which may increase the Fund's exposure to the risks associated with rising interest rates. The price of fixed income securities is also affected by their duration. Fixed income securities with longer duration 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.

 

Large Capitalization Companies Risk

 

The securities of large market capitalization companies may underperform other segments of the market because such companies may be less responsive to competitive challenges and opportunities and may be unable to attain high growth rates during periods of economic expansion.

 

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. Events in the fixed income markets may lead to periods of volatility, unusual liquidity issues and, in some cases, credit downgrades and increased likelihood of default. Such events may cause the value of securities owned by the Fund to go up or down, sometimes rapidly or unpredictably, and may lead to increased redemptions, which could cause the Fund to experience a loss when selling securities to meet redemption requests by shareholders. 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. From time to time, certain investments held by the Fund may have limited marketability or contractual limitations on their resale and may be difficult to value and may be difficult to sell at favorable times or prices.

 

Other Investment Companies Risk

 

The Fund may invest in shares of other registered investment companies, including open-end funds, 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 duration and a decline in its price.

 

Securities Selection Risk

 

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

 

Small and Medium Capitalization Companies Risk

 

Investing in the securities of small and medium capitalization companies involves 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, the securities of these companies may lack sufficient market liquidity, and they can be particularly sensitive to expected changes in interest rates, borrowing costs and earnings.

 

U.S. Government Securities Risk

 

A security backed by the U.S. Treasury or the full faith and credit of the United States is only guaranteed by the applicable entity 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. In addition, because many types of U.S. Government securities trade actively outside the United States, their prices may rise and fall as changes in global economic conditions affect the demand for these securities. Like all bonds, U.S. Government bonds are also subject to credit risk and interest rate risk.

 

Value Stocks Risk

 

Value stocks are subject to the risk that their intrinsic value may never be realized by the market or that their prices may go down. While the Fund's investments in value stocks may limit its downside risk over time, the Fund may produce more modest gains than riskier stock funds as a trade-off for this potentially lower risk. Different investment styles tend to shift in and out of favor, depending on market conditions and investor sentiment.

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 Russell 1000® Value Index, which is the Fund's primary benchmark. The table also shows how the Fund's returns compare to the Barclays® Capital U.S. Aggregate Bond Index, which tracks the performance of fixed-rate debt securities. The Balanced Composite Index is composed of the Russell 1000 Value Index (60%) and the Barclays Capital U.S. Aggregate Bond Index (40%) to reflect the Fund's allocation of its assets between equity securities and fixed income securities. The Lipper® MTAG Funds Index shows how the Fund's performance compares to a composite of mutual funds with similar investment objectives.

 

The chart and the table show the performance of the Fund's Investor Class shares for all periods. The Fund began offering Institutional Class Shares on July 17, 1987, Investor Class shares on August 1, 1994, Advisor Class shares on May 31, 2005, 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 Institutional Class shares is shown for the Y Class shares and the performance of the Investor Class shares is shown for the Advisor Class, A Class and C Class shares, prior to the dates such newer classes were first offered. In each case, the older share classes would have had similar annual returns to the newer share classes because the shares are invested in the same portfolio securities. However, the older share classes had different expenses than the newer share classes. 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 [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 Total Return for the Calendar Year Ended 12/31 of each Year
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Highest Quarterly Return:
    (1/1/04 through 12/31/13)

 

13.19%
(3rd Quarter 2009)

Lowest Quarterly Return:
    (1/1/04 through 12/31/13)

 

-11.13%
(4th 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 13.19%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.13%)
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns For the periods ended December 31, 2013
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.
Russell 1000 Value Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 32.53% [1],[2]
5 Years rr_AverageAnnualReturnYear05 16.67% [1],[2]
10 Years rr_AverageAnnualReturnYear10 7.58% [1],[2]
Barclays Capital U.S. Aggregate Bond Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.02%) [1],[2]
5 Years rr_AverageAnnualReturnYear05 4.44% [1],[2]
10 Years rr_AverageAnnualReturnYear10 4.55% [1],[2]
Balanced Composite Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.66% [1],[2]
5 Years rr_AverageAnnualReturnYear05 12.04% [1],[2]
10 Years rr_AverageAnnualReturnYear10 6.68% [1],[2]
Lipper MTAG Funds Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 20.33% [1],[2]
5 Years rr_AverageAnnualReturnYear05 14.09% [1],[2]
10 Years rr_AverageAnnualReturnYear10 6.76% [1],[2]
A Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 0.50% [3]
Management fees rr_ManagementFeesOverAssets 0.22%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.63%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.11% [4]
1 year rr_ExpenseExampleYear01 682
3 years rr_ExpenseExampleYear03 908
5 years rr_ExpenseExampleYear05 1,152
10 years rr_ExpenseExampleYear10 1,849
1 Year rr_AverageAnnualReturnYear01 13.30% [1],[2]
5 Years rr_AverageAnnualReturnYear05 11.84% [1],[2]
10 Years rr_AverageAnnualReturnYear10 6.15% [1],[2]
Inception Date of Class rr_AverageAnnualReturnInceptionDate May 17, 2010 [1],[2]
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%
Management fees rr_ManagementFeesOverAssets 0.22%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.62%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.85% [4]
Recoupment of prior fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.01%
Total Annual Fund Operating Expenses after recoupment of prior fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.86%
1 year rr_ExpenseExampleYear01 289
3 years rr_ExpenseExampleYear03 583
5 years rr_ExpenseExampleYear05 1,002
10 years rr_ExpenseExampleYear10 2,169
1 year rr_ExpenseExampleNoRedemptionYear01 189
3 years rr_ExpenseExampleNoRedemptionYear03 583
5 years rr_ExpenseExampleNoRedemptionYear05 1,002
10 years rr_ExpenseExampleNoRedemptionYear10 2,169
1 Year rr_AverageAnnualReturnYear01 18.44% [1],[2]
5 Years rr_AverageAnnualReturnYear05 12.59% [1],[2]
10 Years rr_AverageAnnualReturnYear10 6.50% [1],[2]
Inception Date of Class rr_AverageAnnualReturnInceptionDate Sep. 01, 2010 [1],[2]
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
Management fees rr_ManagementFeesOverAssets 0.22%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.46%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.69% [4]
Recoupment of prior fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.02%
Total Annual Fund Operating Expenses after recoupment of prior fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.71%
1 year rr_ExpenseExampleYear01 73
3 years rr_ExpenseExampleYear03 224
5 years rr_ExpenseExampleYear05 387
10 years rr_ExpenseExampleYear10 862
1 Year rr_AverageAnnualReturnYear01 20.74% [1],[2]
5 Years rr_AverageAnnualReturnYear05 13.57% [1],[2]
10 Years rr_AverageAnnualReturnYear10 7.10% [1],[2]
Inception Date of Class rr_AverageAnnualReturnInceptionDate Mar. 01, 2010 [1],[2]
Advisor 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
Management fees rr_ManagementFeesOverAssets 0.22%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.60%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.08% [4]
1 year rr_ExpenseExampleYear01 110
3 years rr_ExpenseExampleYear03 343
5 years rr_ExpenseExampleYear05 595
10 years rr_ExpenseExampleYear10 1,317
1 Year rr_AverageAnnualReturnYear01 20.37% [1],[2]
5 Years rr_AverageAnnualReturnYear05 13.12% [1],[2]
10 Years rr_AverageAnnualReturnYear10 6.63% [1],[2]
Inception Date of Class rr_AverageAnnualReturnInceptionDate May 31, 2005 [1],[2]
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
Management fees rr_ManagementFeesOverAssets 0.22%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.38%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.61% [4]
1 year rr_ExpenseExampleYear01 62
3 years rr_ExpenseExampleYear03 195
5 years rr_ExpenseExampleYear05 340
10 years rr_ExpenseExampleYear10 762
1 Year rr_AverageAnnualReturnYear01 20.88% [1],[2]
5 Years rr_AverageAnnualReturnYear05 13.68% [1],[2]
10 Years rr_AverageAnnualReturnYear10 7.16% [1],[2]
Inception Date of Class rr_AverageAnnualReturnInceptionDate Jul. 17, 1987 [1],[2]
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
Management fees rr_ManagementFeesOverAssets 0.22%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.70%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.93% [4]
1 year rr_ExpenseExampleYear01 95
3 years rr_ExpenseExampleYear03 297
5 years rr_ExpenseExampleYear05 515
10 years rr_ExpenseExampleYear10 $ 1,144
Annual Return 2004 rr_AnnualReturn2004 12.75% [5]
Annual Return 2005 rr_AnnualReturn2005 6.19% [5]
Annual Return 2006 rr_AnnualReturn2006 13.57% [5]
Annual Return 2007 rr_AnnualReturn2007 1.78% [5]
Annual Return 2008 rr_AnnualReturn2008 (25.00%) [5]
Annual Return 2009 rr_AnnualReturn2009 20.25% [5]
Annual Return 2010 rr_AnnualReturn2010 11.49% [5]
Annual Return 2011 rr_AnnualReturn2011 1.45% [5]
Annual Return 2012 rr_AnnualReturn2012 13.79% [5]
Annual Return 2013 rr_AnnualReturn2013 20.56% [5]
1 Year rr_AverageAnnualReturnYear01 20.56% [1],[2]
5 Years rr_AverageAnnualReturnYear05 13.29% [1],[2]
10 Years rr_AverageAnnualReturnYear10 6.83% [1],[2]
Inception Date of Class rr_AverageAnnualReturnInceptionDate Aug. 01, 1994 [1],[2]
Investor Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.72% [1],[2]
5 Years rr_AverageAnnualReturnYear05 12.09% [1],[2]
10 Years rr_AverageAnnualReturnYear10 5.49% [1],[2]
Inception Date of Class rr_AverageAnnualReturnInceptionDate Aug. 01, 1994 [1],[2]
Investor Class | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.53% [1],[2]
5 Years rr_AverageAnnualReturnYear05 10.34% [1],[2]
10 Years rr_AverageAnnualReturnYear10 5.20% [1],[2]
Inception Date of Class rr_AverageAnnualReturnInceptionDate Aug. 01, 1994 [1],[2]
[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 table shows the after-tax return of the Fund's Investor Class shares for consistency with disclosures included in the Fund's annual report to shareholders for the period ended October 31, 2013.
[3] 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.
[4] 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.
[5] The bar chart shows the performance of the Fund's Investor Class shares for consistency with disclosures included in the Fund's annual report to shareholders for the period ended October 31, 2013.