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(American Beacon SSI Alternative Income Fund℠)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading <strong> Investment Objectives </strong>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund's investment objectives are to seek income and, secondarily, absolute returns.
Expense [Heading] rr_ExpenseHeading <strong> Fees and Expenses of the Fund </strong>
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. More information is available from your financial professional and in "Choosing Your Share Class" on page 20 of the Prospectus. Although the Fund does not impose any sales charge on Y Class shares, you may pay a commission to your broker on your purchases and sales of those shares, which is not reflected in the tables or Example below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <strong>Shareholder Fees (fees paid directly from your investment)</strong>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <strong>Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)</strong>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination October 28, 2021
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other Expenses and Acquired Fund Fees and Expenses are based on estimated expenses for the current fiscal year.
Expense Example [Heading] rr_ExpenseExampleHeading <strong>Example</strong>
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, except that the Example reflects the fee waiver/expense reimbursement arrangement for the Institutional and Investor classes through October 28, 2021. Although your actual costs may be higher or lower, based on these assumptions, whether you redeem or hold your shares, your costs would be:
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <strong> Portfolio Turnover </strong>
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. The Fund's portfolio turnover rate for the Fund's last fiscal year (which is the portfolio turnover rate of the Fund's predecessor) was 52% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 52.00%
Strategy [Heading] rr_StrategyHeading <strong> Principal Investment Strategies </strong>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks primarily to invest in convertible securities and to establish short positions in the common stock of the issuers of the convertible securities. The short positions are intended to reduce the Fund's exposure to decreases in the price of the related common stock. The Fund seeks to hedge its long positions in this way on a security-by-security basis. The term "convertible security" refers to a bond or a preferred stock (including a trust preferred security) that can be converted into shares of a company's common stock. The Fund's strategy in this regard is managed on a day-to-day basis by SSI Investment Management LLC, the sub-advisor to the Fund.
Pursuant to its strategy, the Fund seeks returns that exceed prevailing short-term interest rates, such as the return on 90-day U.S. Treasury bills, from four primary sources: 1) net dividend income on equity and convertible securities positions; 2) interest income on convertible securities positions; 3) interest rebates on short positions; and 4) net capital gains from trading profits.
In combining long positions in convertible securities with short positions in common stock of the issuers of those securities, the Fund seeks to maintain a "hedged convertible" investment portfolio with income and returns which are generally less volatile than and have low correlation with the broader capital markets, short-term interest rates and capital markets indices (absolute returns).
The Fund generally invests in convertible securities that are part of an issuance of at least $40 million in size and are issued by companies with market capitalizations between $500 million and $10 billion. The convertible securities are typically callable by the issuer and are not limited as to duration or maturity. The issuers of the convertible securities in which the Fund will invest may include U.S. or non-U.S. companies, real estate investment trusts ("REITs"), and emerging-market companies. The instruments may be denominated in foreign, or non-U.S., currencies; however, such exposures are typically hedged back to the U.S. dollar. The Fund may hold investment-grade, below investment-grade (i.e., "high yield" or "junk" bonds) and unrated securities that are deemed by the sub-advisor to be of equivalent quality. The Fund's holdings may include variable-rate coupon, zero-coupon and pay-in-kind ("PIK") instruments and restricted securities, such as those issued under Rule 144A of the Securities Act of 1933. To a lesser extent, the Fund may utilize securities issued by business development companies and may invest long or short in exchange-traded funds ("ETFs") to adjust or hedge exposures.
The Fund may also invest in long or short positions in derivative instruments, such as futures, forwards, swaps, options and warrants, to hedge exposures in the Fund. Futures contracts generally include those based on U.S. treasuries, forward contracts are generally forward currency contracts (including non-deliverable forwards), swaps generally include interest rate and credit default swaps, options generally include call and put options, and warrants are generally similar to long-dated call options. On a short-term basis, the Fund may invest cash balances in other investment companies, including money market funds that are advised by the Manager.
The sub-advisor seeks to identify convertible securities that it believes are undervalued by assessing, among other attributes, the quality, income, liquidity and "equity sensitivity" of the security (i.e., the sensitivity of a convertible security's price to changes in the price of the issuer's common stock). The sub-advisor also considers the availability of the common stock that it intends to short.
After acquiring a convertible security, the Fund establishes a short position in the common stock, American Depositary Receipt ("ADR"), call option or other equity-related instrument of the same issuer. The size of each short position is based on the sensitivity of the convertible security's price to changes in the price of the issuer's common stock. As a result, the Fund's short positions will generally be smaller on a dollar value basis than its long positions since a convertible security's price is typically less sensitive than that of the common stock. The sub-advisor considers selling a convertible security and closing the related short position when it determines the convertible security is no longer undervalued, when it determines that convertible securities overall are no longer undervalued, when it anticipates a potentially unfavorable change in the structure of a convertible security or the underlying company or to satisfy shareholder redemptions, among other reasons.
Risk [Heading] rr_RiskHeading <strong> Principal Risks </strong>
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
There is no assurance that the Fund will achieve its investment objectives 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, which are described in alphabetical order and not in order of importance or potential exposure, are:
Allocation Risk
The Manager's and the sub-advisor's judgments about, and allocations among, asset classes and market exposures may adversely affect the Fund's performance. This risk may be increased by the use of derivatives to increase allocations to various market exposures.
Callable Securities Risk
The Fund may invest in fixed-income securities with call features. A call feature allows the issuer of the security to redeem or call the security prior to its stated maturity date. In periods of falling interest rates, issuers may be more likely to call in securities that are paying higher coupon rates than prevailing interest rates. In the event of a call, the Fund would lose the income that would have been earned to maturity on that security, and the proceeds received by the Fund may be invested in securities paying lower coupon rates and may not benefit from any increase in value that might otherwise result from declining interest rates.
Convertible Securities Risk
The value of a convertible security typically increases or decreases with the price of the underlying common stock. In general, a convertible security is subject to the risks of stocks when the underlying stock's price is high relative to the conversion price and is subject to the risks of debt securities when the underlying stock's price is low relative to the conversion price. Many convertible securities have credit ratings that are below investment grade and are subject to the same risks as an investment in below investment grade debt securities (commonly known as "junk bonds"). Convertible securities are subject to the risk that the credit standing of the issuer may have an effect on the convertible security's investment value. In addition, because companies that issue convertible securities may be small- or mid-cap companies, to the extent the Fund invests in convertible securities issued by small- or mid-cap companies, it will be subject to the risks of investing in such companies. The stocks of small- and mid-cap companies may fluctuate more widely in price than the market as a whole and there may also be less trading in small- or mid-cap stocks. Convertible securities are sensitive to movement in interest rates.
Counterparty Risk
The Fund is subject to the risk that a party or participant to a transaction, such as a broker or derivative counterparty, will be unwilling or unable to satisfy its obligation to make timely principal, interest or settlement payments or to otherwise honor its obligations to the Fund.
Credit Risk
The Fund is subject to the risk that the issuer or guarantor of an obligation, or the counterparty to a transaction, including a derivatives contract or a loan will fail to make timely payment of interest or principal or otherwise honor its obligations or default completely. Credit risk is typically greater for securities with ratings that are below investment grade (commonly referred to as "junk bonds"). Since the Fund can invest significantly in lower-quality debt securities considered speculative in nature, this risk will be substantial. A downgrade or default affecting any of the Fund's securities could affect the Fund's performance.
Currency Risk
The Fund may have exposure to foreign currencies by making investments in securities denominated in non-U.S. currencies or by purchasing or selling forward currency exchange contracts in non-U.S. currencies or non-U.S. currency futures contracts. Foreign currencies will fluctuate, and 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.
Cybersecurity and Operational Risk
The Fund and its service providers, and shareholders' ability to transact with the Fund, may be negatively impacted due to operational risks arising from, among other problems: human errors, systems and technology disruptions or failures, or cybersecurity incidents. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, customer data, or proprietary information, or cause the Fund or its service providers, as well as the securities trading venues and their service providers, to suffer data corruption or lose operational functionality. It is not possible for the Fund or its service providers to identify all of the operational risks that may affect the Fund or to develop processes and controls to completely eliminate or mitigate their occurrence or effects. Most issuers in which the Fund invests are heavily dependent on computers for data storage and operations, and require ready access to the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of securities in which the Fund invests, leading to significant loss of value.
Derivatives Risk
Derivatives may involve significant risk. The use of derivative instruments may expose the Fund to additional risks that it would not be subject to if it invested directly in the securities or other instruments underlying those derivatives, including the high degree of leverage often embedded in such instruments, and potential material and prolonged deviations between the theoretical value and realizable value of a derivative. 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 or sell derivatives not traded on an exchange and which may be subject to heightened liquidity and valuation risk. Derivative investments can increase portfolio turnover and transaction costs. Derivatives also are subject to counterparty risk and credit risk. 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. Ongoing changes to regulation of the derivatives markets and potential changes in the regulation of funds using derivative instruments could limit the Fund's ability to pursue its investment strategies. In addition, the Fund's investments in derivatives are subject to the following risks:
  • Futures and Forward Contracts. Futures and forward contracts, including non-deliverable forwards ("NDFs"), are derivative instruments pursuant to a contract where the parties agree to 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. There may be an imperfect correlation between the movement in prices of the futures contracts and the value of their underlying instruments or indexes. There are no limitations on daily price movements of forward contracts. There can be no assurance that any strategy used will succeed. Not all forward contracts, including NDFs, require a counterparty to post collateral, which may expose the Fund to greater losses in the event of a default by a counterparty. There can be no assurance that, at all times, a liquid market will exist for offsetting a futures contract that the Fund has previously bought or sold and this may result in the inability to close a futures contract when desired. Forward currency transactions and forward currency contracts, including NDFs, include the risks associated with fluctuations in currency. Interest rate and Treasury futures contracts expose the Fund to price fluctuations resulting from changes in interest rates. The Fund could suffer a loss if interest rates rise after the Fund has purchased an interest rate futures contract or fall after the Fund has sold an interest rate futures contract. Similarly, Treasury futures contracts expose the Fund to potential losses if interest rates do not move as expected.
  • Options. In order for a call option to be profitable, the market price of the underlying security or index must rise sufficiently above the call option exercise price to cover the premium and any transaction costs. These costs will reduce any profit that might otherwise have been realized had the Fund bought the underlying security instead of the call option. For a put option to be profitable, the market price of the underlying security or index must decline sufficiently below the put option's exercise price to cover the premium and any transaction costs. By using put options in this manner, the Fund will reduce any profit it might otherwise have realized from having shorted the declining underlying security. If the Fund sells a put option, there is a risk that the Fund may be required to buy the underlying asset at a disadvantageous price. If the Fund sells a call option, there is a risk that the Fund may be required to sell the underlying asset at a disadvantageous price. If the Fund sells a call option on an underlying asset that the Fund owns, and the underlying asset has increased in value when the call option is exercised, the Fund will be required to sell the underlying asset at the call price and the Fund will not be able to realize any of the value of the underlying asset above the call price.
  • Swap Agreements. Swaps can involve greater risks than a direct investment in an underlying asset because swaps typically include a certain amount of embedded leverage and as such are subject to leverage risk. If swaps are used as a hedging strategy, the Fund is subject to the risk that the hedging strategy may not eliminate the risk that it is intended to offset, due to, among other reasons, the occurrence of unexpected price movements or the non-occurrence of expected price movements. Swaps also may be difficult to value, and swaps that are traded over-the-counter are not subject to standardized clearing requirements and may involve greater counterparty, credit and liquidity risk. In addition, interest rate swaps are subject to interest rate risk, credit default swaps are subject to the risks associated with the purchase and sale of credit protection, and both interest rate swaps and credit default swaps are subject to counterparty risk, credit risk and liquidity risk.
  • Warrants. Warrants may be more speculative than certain other types of investments because warrants do not carry with them dividend or voting rights with respect to the underlying securities, or any rights in the assets of the issuer. In addition, the value of a warrant does not necessarily change with the value of the underlying securities, and a warrant ceases to have value if it is not exercised prior to its expiration date. The market for warrants may be very limited and there may at times not be a liquid secondary market for warrants.
Emerging Markets Risk
When investing in emerging markets, the risks of investing in foreign securities discussed below are heightened. 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 resulting in increased volatility and limited liquidity for emerging market securities; trading suspensions; and delays and disruptions in securities settlement procedures.
Equity Investments Risk
Equity securities are subject to investment risk and market risk. The Fund's investments in U.S. and foreign equity securities may include common stocks, depositary receipts and U.S. dollar-denominated foreign stocks traded on U.S. exchanges, preferred stocks and REITs. Such investments may expose the Fund to additional risks.
  • Common Stock. The value of a company's common stock may fall as a result of factors affecting the company, companies in the same industry or sector, or the financial markets overall. Common stock generally is subordinate to preferred stock upon the liquidation or bankruptcy of the issuing company.
  • Depositary Receipts and U.S. Dollar-Denominated Foreign Stocks Traded on U.S. Exchanges. Depositary receipts 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, including, but not limited to, currency exchange rate fluctuations, political and financial instability in the home country of a particular depositary receipt or foreign stock, less liquidity and more volatility, less government regulation and supervision and delays in transaction settlement.
  • Preferred Stocks. Preferred stocks are sensitive to movements in interest rates. Preferred stocks may be less liquid than common stocks and, unlike common stocks, participation in the growth of an issuer may be limited. Distributions on preferred stocks generally are payable at the discretion of an issuer and after required payments to bond holders.
  • REITs. 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. REITs also are dependent upon the skills of their managers and are subject to heavy cash flow dependency or self-liquidation. Domestic REITs could be adversely affected by failure to qualify for tax-free "pass-through" of distributed net income and net realized gains under the Internal Revenue Code of 1986, as amended ("Internal Revenue Code"), or to maintain their exemption from registration under the Investment Company Act of 1940, as amended ("Investment Company Act"). REITs typically incur fees that are separate from those incurred by the Fund. Accordingly, the Fund's investment in REITs will result in the layering of expenses such that shareholders will indirectly bear a proportionate share of the REITs' operating expenses, in addition to paying Fund expenses. The value of REIT common stock may decline when interest rates rise.
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, (4) lack of uniform accounting, auditing and financial reporting standards, (5) increased volatility, (6) different government regulation and supervision of foreign stock exchanges, brokers and listed companies, and (7) delays in transaction settlement in some foreign markets.
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. In addition, hedges, even when successful in mitigating risk, may not prevent the Fund from experiencing losses on its investments, and therefore the use of hedging strategies may reduce the Fund's return, or create a loss.
High Yield Securities Risk
Exposure to high yield, below investment-grade securities (commonly referred to as "junk bonds") generally involves significantly greater risks of loss of your money than an investment in investment grade securities. High yield debt securities may fluctuate more widely in price and yield and may fall in price when the economy is weak or expected to become weak. High yield securities are considered to be speculative with respect to an issuer's ability to pay interest and principal and carry a greater risk that the issuers of lower-rated securities will default on the timely payment of principal and interest. Below investment grade securities may experience greater price volatility and less liquidity than investment grade securities.
Illiquid and Restricted Securities Risk
Securities not registered in the U.S. under the Securities Act of 1933, as amended (the "Securities Act") or in non-U.S. markets pursuant to similar regulations, including Rule 144A securities, are restricted as to their resale. Such securities may not be listed on an exchange and may have no active trading market. They may be more difficult to purchase or sell at an advantageous time or price because such securities may not be readily marketable in broad public markets, or may have to be held for a certain time period before they can be resold. The Fund may not be able to sell a restricted security when the sub-advisor considers it desirable to do so and/or may have to sell the security at a lower price than the Fund believes is its fair market value. In addition, transaction costs may be higher for restricted securities and the Fund may receive only limited information regarding the issuer of a restricted security. The Fund may have to bear the expense of registering restricted securities for resale and the risk of substantial delays in effecting the registration.
Interest Rate Risk
The Fund is subject to the risk that the market value of securities or derivatives it holds will decline due to rising interest rates. Generally, the value of investments with interest rate risk, such as fixed income securities, will move in the opposite direction to movements in interest rates. The Federal Reserve has raised the federal funds rate several times since December 2015 and may continue to increase rates in the future. Interest rates may rise, perhaps significantly and/or rapidly, potentially resulting in substantial losses to the Fund. The prices of fixed income securities or derivatives are also affected by their durations. Fixed income securities or derivatives with longer durations generally have greater sensitivity to changes in interest rates. For example, if a bond has a duration of four years, a 1% increase in interest rates could be expected to result in a 4% decrease in the value of the bond. An increase in interest rates can impact markets broadly as well. Some investors buy securities and derivatives with borrowed money; an increase in interest rates can cause a decline in those markets.
Investment Risk
An investment in the Fund is not a deposit with 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, and/or the return generated by, 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 the high growth rates of successful smaller companies, especially during periods of economic expansion.
Leverage Risk
The Fund's use of 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. Leverage may result in losses that exceed the amount originally invested and may accelerate the rate of losses. Leverage 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 ("NAV") per share to be volatile.
Liquidity Risk
The Fund is susceptible to the risk that certain investments held by the Fund, such as derivative instruments and certain fixed income instruments, may have limited marketability or be subject to restrictions on sale, and may be difficult or impossible to purchase or sell at favorable times or prices. Market prices for such instruments may be volatile. The Fund could lose money if it is unable to dispose of an investment at a time that is most beneficial to the Fund. The Fund may be required to dispose of investments at unfavorable times or prices to satisfy obligations, which may result in losses or may be costly to the Fund. For example, liquidity risk may be magnified in rising interest rate environments due to higher than normal redemption rates. Unexpected redemptions may force the Fund to sell certain investments at unfavorable prices to meet redemption requests or other cash needs. Judgment plays a greater role in pricing illiquid investments than in investments with more active markets.
Market Risk
In recent periods, fixed income instruments have experienced unusual liquidity issues, increased price volatility and, in some cases, credit downgrades and increased likelihood of default. These events have reduced the willingness and ability of some lenders to extend credit, and have made it more difficult for some borrowers to obtain financing on attractive terms, if at all. In addition, global economies and financial markets are becoming increasingly interconnected, which increases the possibilities that conditions in one country or region might adversely impact issuers in a different country or region. A rise in protectionist trade policies, risks associated with the United Kingdom's vote to leave the European Union, the risk of a "trade war" between the United States and China, and the possibility of changes to some international trade agreements, could affect the economies of many nations, including the United States, in ways that cannot necessarily be foreseen at the present time. The severity or duration of adverse economic conditions may also be affected by policy changes made by governments or quasi-governmental organizations.
In addition, political and governmental events within the U.S. and abroad may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree. High public debt in the U.S. and other countries creates ongoing systemic and market risks and policymaking uncertainty. Because the impact on the markets has been widespread, it may be difficult to identify both risks and opportunities using past models of the interplay of market forces, or to predict the duration of these market conditions. Interest rates have been unusually low in recent years in the U.S. and abroad. Because there is little precedent for this situation, it is difficult to predict the impact on various markets of a significant rate increase, whether brought about by U.S. policy makers or by dislocations in world markets. In addition, there is a risk that the prices of goods and services in the U.S. and many foreign economies may decline over time, known as deflation (the opposite of inflation). Deflation may have an adverse effect on stock prices and creditworthiness and may make defaults on debt more likely.
Market Timing Risk
Because the Fund invests in foreign securities, or it has exposure to foreign securities through the derivatives it holds, it is particularly subject to the risk of market timing activities. Frequent trading by Fund shareholders poses risks to other shareholders in the Fund, including (i) the dilution of the Fund's NAV, (ii) an increase in the Fund's expenses, and (iii) interference with the portfolio manager's ability to execute efficient investment strategies. Because of specific types of securities in which the Fund may invest, it could be subject to the risk of market timing activities by shareholders.
Other Investment Companies Risk
The Fund may invest in shares of other registered investment companies, including exchange-traded funds ("ETFs"), business development companies ("BDCs") and money market funds. To the extent that the Fund invests in shares of other registered investment companies, the Fund will indirectly bear the fees and expenses charged by those investment companies in addition to the Fund's direct fees and expenses and will be subject to the risks associated with investments in those companies. For example, money market funds are subject to interest rate risk, credit risk, and market risk. To the extent the Fund invests in ETFs that invest in equity securities, fixed income securities and/or foreign securities, or track an index, the Fund is subject to the risks associated with the underlying investments held by the ETF or the index fluctuations to which the ETF is subject. Because ETFs are listed on an exchange, they may be subject to trading halts, may trade at a premium or discount to their NAV and may not be liquid. The Fund's investments in BDCs may be subject to certain additional risks, including competition for limited investment opportunities, the liquidity of a BDC's investments, uncertainty as to the value of a BDC's investments, risks associated with access to capital and leverage, and reliance on the management of a BDC.
Pay-In-Kind Securities Risk
Pay-in-kind securities are debt securities that do not make regular cash interest payments. Pay-in-kind securities pay interest through the issuance of additional securities. Because these securities do not pay current cash income, their price can be volatile when interest rates fluctuate. In order to continue to qualify for treatment as a "regulated investment company" under the Internal Revenue Code and avoid federal excise tax, the Fund may be required to distribute a portion of such non-cash income and may be required to dispose of other portfolio securities (which may occur in periods of adverse market prices) in order to generate cash to meet these distribution requirements.
Redemption Risk
The Fund may experience periods of high levels of redemptions that could cause the Fund to sell assets at inopportune times or at a loss or depressed value. The sale of assets to meet redemption requests may create net capital gains, which could cause the Fund to have to distribute substantial capital gains. Redemption risk is heightened during periods of declining or illiquid markets. Heavy redemptions could hurt the Fund's performance.
Securities Selection Risk
Securities selected by the 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.
Segregated Assets Risk
In connection with certain transactions that may give rise to future payment obligations, including short sales and investments in derivatives, the Fund may be required to maintain a segregated amount of, or otherwise earmark, cash or liquid securities to cover the obligation. Segregated assets cannot be sold while the position they are covering is outstanding unless they are replaced with other assets of equal value. The need to maintain cash or other liquid securities in segregated accounts could limit the Fund's ability to pursue other opportunities as they arise.
Short Position Risk
The Fund's losses are potentially unlimited in a short position transaction because there is potentially no limit on the amount that the security that the Fund is required to purchase may have appreciated. Because the Fund may invest the proceeds of a short sale, another effect of short selling on the Fund is similar to the effect of leverage, in that it may amplify changes in the Fund's NAV since it may increase the exposure of the Fund to certain markets.
Small and Mid-Capitalization Companies Risk
Investing in the securities of small and mid-capitalization companies involves greater risk and the possibility of greater price volatility than investing in larger capitalization and more established companies. Since small and mid-capitalization companies may have narrower commercial markets and more limited operating history, product lines, and managerial and financial resources than larger, more established companies, 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. In general, these risks are greater for small-capitalization companies than for mid-capitalization companies.
Trust Preferred Securities Risk
Trust preferred securities are subject to market risk and credit risk. Holders of the trust preferred securities have limited voting rights to control the activities of the trust and no voting rights with respect to the parent company.
Unrated Securities Risk
Because the Fund may purchase securities that are not rated by any rating organization, the sub-advisor, after assessing their credit quality, may internally assign ratings to certain of those securities in categories similar to those of rating organizations. 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. Unrated securities may be subject to greater liquidity risk and price volatility.
Variable and Floating Rate Securities Risk
The coupons on variable and floating-rate securities are not fixed and may fluctuate based upon changes in market rates. The coupon on a floating rate security is generally based on an interest rate, such as a money-market index, London Interbank Offered Rate ("LIBOR") or a Treasury bill rate. Variable and floating rate securities are subject to interest rate risk and credit risk.
As short-term interest rates decline, the coupons on floating-rate securities typically decrease. Alternatively, during periods of rising interest rates, the coupons on floating-rate securities typically increase. Changes in the coupons of floating-rate securities may lag behind changes in market rates or may have limits on the maximum increases in the coupon rates. The value of floating-rate securities may decline if their coupons do not rise as much, or as quickly, as interest rates in general. Floating rate securities will not generally increase in value if interest rates decline.
Zero Coupon Securities Risk
Zero coupon securities are securities that do not make periodic interest payments. Accordingly, zero coupon securities usually trade at a deep discount from their face or par value and will be subject to greater fluctuations in market value in response to changing interest rates than debt obligations of comparable maturities that make current distribution of interest in cash.
Risk Lose Money [Text] rr_RiskLoseMoney There is no assurance that the Fund will achieve its investment objectives 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 with 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 <strong> Fund Performance </strong>
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 a broad-based market index, which is the Fund's benchmark index, as well as the benchmark index of the Fund's predecessor.
The Fund has not commenced operations prior to the date hereof. The Fund acquired the assets and liabilities of the Palmer Square SSI Alternative Income Fund, a series of Investment Managers Series Trust, in a reorganization that closed on May 17, 2019. In connection with that reorganization, the Y Class shares and Investor Class shares of the Fund have adopted the performance history and financial statements of the Class I shares and Class A shares, respectively, of the Fund's predecessor. The bar chart and table below show the performance of the Fund's Y Class shares for all periods. The table below also shows the performance of the Fund's Investor Class shares for all periods (which differs from the performance of the Class A shares of the Fund's predecessor to the extent that the performance of the Class A shares reflected the deduction of applicable sales charges). Performance information for Institutional Class shares of the Fund is not provided because this share class of the Fund had not commenced operations prior to the date of this Prospectus and has not adopted the performance history and financial statements of any class of the Fund's predecessor. 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.
Bar Chart [Heading] rr_BarChartHeading <strong>Calendar year total returns for Y Class Shares. Year Ended 12/31</strong>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest Quarterly Return:
3.18% 2nd Quarter 2016
01/01/2013 through 12/31/2018
Lowest Quarterly Return:
(2.03%) 3rd Quarter 2015
01/01/2013 through 12/31/2018
The calendar year-to-date total return as of March 31, 2019 was 2.64%
Performance Table Heading rr_PerformanceTableHeading <strong>Average annual total returns for periods ended December 31, 2018 </strong>
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
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 income taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. The return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. If you are a tax-exempt entity or hold your Fund shares through a tax-deferred arrangement, such as an individual retirement account ("IRA") or a 401(k) plan, the after-tax returns do not apply to your situation. After-tax returns are shown only for the Fund's Y Class shares; after-tax returns for other share classes will vary.
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 income taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred If you are a tax-exempt entity or hold your Fund shares through a tax-deferred arrangement, such as an individual retirement account ("IRA") or a 401(k) plan, the after-tax returns do not apply to your situation.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.
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.
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. The table shows how the Fund's performance compares to a broad-based market index, which is the Fund's benchmark index, as well as the benchmark index of the Fund's predecessor.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for the Fund's Y Class shares; after-tax returns for other share classes will vary.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.americanbeaconfunds.com
(American Beacon SSI Alternative Income Fund℠) | ICE BofAML 3-Month U.S. Treasury Bill Index (Reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.87%
5 Years rr_AverageAnnualReturnYear05 0.63%
Since Inception rr_AverageAnnualReturnSinceInception 0.50%
(American Beacon SSI Alternative Income Fund℠) | FTSE 3-Month T-Bill Index (Reflects no deduction for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.86% [1]
5 Years rr_AverageAnnualReturnYear05 0.60% [1]
Since Inception rr_AverageAnnualReturnSinceInception 0.47% [1]
(American Beacon SSI Alternative Income Fund℠) | Y Class  
Prospectus: rr_ProspectusTable  
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 Fee rr_ManagementFeesOverAssets 1.30%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.41% [2]
Dividend Expenses on Securities Sold Short rr_Component1OtherExpensesOverAssets 0.19%
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.22%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.73%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.73%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 176
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 545
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 939
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,041
Annual Return 2013 rr_AnnualReturn2013 2.34%
Annual Return 2014 rr_AnnualReturn2014 (0.79%)
Annual Return 2015 rr_AnnualReturn2015 (2.39%)
Annual Return 2016 rr_AnnualReturn2016 5.68%
Annual Return 2017 rr_AnnualReturn2017 4.35%
Annual Return 2018 rr_AnnualReturn2018 0.57%
Year to Date Return, Label rr_YearToDateReturnLabel The calendar year-to-date total return as of March 31, 2019 was 2.64%
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.64%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2019
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return: 3.18% 2nd Quarter 2016 01/01/2013 through 12/31/2018
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.18%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2016
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return: (2.03%) 3rd Quarter 2015 01/01/2013 through 12/31/2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.03%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
1 Year rr_AverageAnnualReturnYear01 0.57%
5 Years rr_AverageAnnualReturnYear05 1.44%
Since Inception rr_AverageAnnualReturnSinceInception 1.81%
Inception Date of Class rr_AverageAnnualReturnInceptionDate May 25, 2012
(American Beacon SSI Alternative Income Fund℠) | Y Class | Returns After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 (0.09%)
5 Years rr_AverageAnnualReturnYear05 0.78%
Since Inception rr_AverageAnnualReturnSinceInception 1.21%
Inception Date of Class rr_AverageAnnualReturnInceptionDate May 25, 2012
(American Beacon SSI Alternative Income Fund℠) | Y Class | Returns After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.44%
5 Years rr_AverageAnnualReturnYear05 0.93%
Since Inception rr_AverageAnnualReturnSinceInception 1.26%
Inception Date of Class rr_AverageAnnualReturnInceptionDate May 25, 2012
(American Beacon SSI Alternative Income Fund℠) | Institutional Class  
Prospectus: rr_ProspectusTable  
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 Fee rr_ManagementFeesOverAssets 1.30%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.43% [2]
Dividend Expenses on Securities Sold Short rr_Component1OtherExpensesOverAssets 0.19%
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.75%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [3]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.70%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 173
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 539
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 937
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,052
(American Beacon SSI Alternative Income Fund℠) | Investor Class  
Prospectus: rr_ProspectusTable  
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 Fee rr_ManagementFeesOverAssets 1.30%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.81% [2]
Dividend Expenses on Securities Sold Short rr_Component1OtherExpensesOverAssets 0.19%
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.62%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.13%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.11%) [3]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 2.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 205
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 640
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,118
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,440
1 Year rr_AverageAnnualReturnYear01 0.24%
5 Years rr_AverageAnnualReturnYear05 1.18%
Since Inception rr_AverageAnnualReturnSinceInception 1.57%
Inception Date of Class rr_AverageAnnualReturnInceptionDate May 25, 2012
[1] The Fund's primary benchmark is the ICE BofAML 3-Month U.S. Treasury Bill Index. The benchmark index of the Fund's predecessor was the FTSE 3-Month T-Bill Index. The Manager has elected to use the ICE BofAML 3-Month U.S. Treasury Bill Index as the Fund's primary benchmark to conform with the index provider used by other funds in the American Beacon Funds Complex.
[2] Other Expenses and Acquired Fund Fees and Expenses are based on estimated expenses for the current fiscal year.
[3] The Manager has contractually agreed to waive fees and/or reimburse expenses of the Fund's Institutional Class and Investor Class shares, as applicable, through October 28, 2021 to the extent that Total Annual Fund Operating Expenses exceed 1.49% for the Institutional Class and 1.81% for the Investor Class (excluding taxes, interest, brokerage commissions, acquired fund fees and expenses, securities lending fees, expenses associated with securities sold short, litigation, and other extraordinary expenses). The contractual expense reimbursement can be changed or terminated only in the discretion and with the approval of a majority of the Fund's Board of Trustees. Under that agreement, the Manager can be reimbursed by the Fund for any contractual fee waivers or expense reimbursements if reimbursement to the Manager (a) occurs within three years after the Manager's own waiver or reimbursement and (b) does not cause the Total Annual Fund Operating Expenses of a class to exceed the contractual percentage limit in effect at the time of the waiver/reimbursement or the time of the recoupment.