Objective, Primary [Text Block]

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Objective [Heading]

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Investment Objective

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The Fund seeks long-term growth of capital.

Expense [Heading]

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Fees and Expenses of the Fund

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 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 all classes of the American Beacon Funds on an aggregated basis. More information about these and other discounts is available from your financial professional and in “Choosing Your Share Class” on page 21 of the Prospectus and “Additional Purchase and Sale Information for A Class Shares” on page 31 of the Statement of Additional Information (“SAI”). With respect to purchases of shares through specific intermediaries, you may find additional information regarding sales charge discounts and waivers in Appendix A to the Fund’s Prospectus entitled “Intermediary Sales Charge Discounts, Waivers and Other Information.”

Expense Breakpoint Discounts [Text]

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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 all classes of the American Beacon Funds on an aggregated basis.

Expense Breakpoint, Minimum Investment Required [Amount]

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$ 50,000

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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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

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December 31, 2025

Expenses Deferred Charges [Text Block]

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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.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

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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]

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Example

Expense Example Narrative [Text Block]

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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 this Example reflects the fee waiver/expense reimbursement arrangement for each share class through December 31, 2025. C Class shares automatically convert to A Class shares 8 years after purchase, if the conversion is available through your financial intermediary. This Example reflects your costs as though C Class shares were held for the full 10-year period. 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]

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Assuming no redemption of shares:

Portfolio Turnover [Heading]

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Portfolio Turnover

Portfolio Turnover [Text Block]

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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 16% of the average value of its portfolio.

Portfolio Turnover, Rate

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16.00%

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of medium capitalization companies. The Fund considers a company to be a medium capitalization company if it has a market capitalization (stock market worth), at the time of investment, between $1 billion and the market capitalization of the largest company in the Russell Midcap^® Index, which was $88.9 billion as of March 31, 2024. The Fund may also invest in equity securities of small-capitalization and large-capitalization companies.

Most of the assets of the Fund are invested in U.S. common stocks that Stephens Investment Management Group, LLC (“SIMG”) believes have clear indicators of future earnings growth, or that demonstrate other potential for growth of capital. The Fund may invest in other securities, including U.S. dollar denominated foreign stock traded on U.S. exchanges. In selecting companies for the Fund, SIMG primarily employs fundamental research with a focus on earnings growth. SIMG will sell a security when appropriate and consistent with the Fund’s investment objective and policies.

Although the Fund seeks investments across a number of sectors, from time to time, the Fund may have significant positions in particular sectors, including the Information Technology sector. However, as the sector composition of the Fund’s portfolio changes over time, the Fund’s exposure to the Information Technology sector may be lower at a future date, and the Fund’s exposure to other market sectors may be higher.

The Fund may also invest cash balances in other investment companies, including a government money market fund advised by the Manager, with respect to which the Manager receives a management fee. The Fund may seek to earn additional income by lending its securities to certain qualified broker-dealers and institutions.

Risk [Heading]

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Principal Risks

Bar Chart and Performance Table [Heading]

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Fund Performance

Performance Narrative [Text Block]

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The bar chart and table below provide an indication of risk by showing changes in the Fund’s performance over time. The bar chart shows how the Fund’s performance has varied from year to year. The table shows how the Fund’s average annual total returns compare to a broad-based market index for the periods indicated.

The chart and the table show the performance of the Fund’s Investor Class shares for all periods. In the table below, for the period prior to December 31, 2018, the performance of the Fund’s R6 Class shares reflects the returns of the R5 Class shares of the Fund. The R6 Class shares would have had similar annual returns to the R5 Class shares because the shares of each class represent investments in the same portfolio securities. However, as reflected in the “Fees and Expenses of the Fund” section of this Fund Summary, the expenses of the R5 Class shares differ from those of the R6 Class shares, which would affect performance. To the extent that the Fund’s R5 Class shares may have had lower expenses than the R6 Class shares prior to December 31, 2018, the performance of the R5 Class shares would likely have been higher than the performance the R6 Class shares would have realized during the same period. The performance of the R6 Class shares shown in the table has not been adjusted for differences in operating expenses between that share class and the R5 Class shares.

C Class shares automatically convert to A Class shares 8 years after purchase, if the conversion is available through your financial intermediary. In the table below, the performance for C Class shares reflects the conversion of C Class shares to A Class shares after 8 years. 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]

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Performance Availability Website Address [Text]

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www.americanbeaconfunds.com

Performance Past Does Not Indicate Future [Text]

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Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Bar Chart [Heading]

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Calendar year total returns for Investor Class Shares. Year Ended 12/31

Performance Table Uses Highest Federal Rate

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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

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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 One Class of after Tax Shown [Text]

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After-tax returns are shown only for Investor Class shares of the Fund; after-tax returns for other share classes will vary.

Performance Table Explanation after Tax Higher

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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.

Bar Chart Closing [Text Block]

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Highest Quarterly Return:
34.11%2nd Quarter 2020
01/01/2014 through 12/31/2023

Lowest Quarterly Return:
-20.89%2nd Quarter 2022
01/01/2014 through 12/31/2023

Performance Table Heading

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Average annual total returns for periods ended December 31, 2023

Performance Table Closing [Text Block]

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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 Investor Class shares of the Fund; after-tax returns for other share classes will vary.

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Cybersecurity and Operational Risk [Member]

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Equity Investments Risk [Member]

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Cybersecurity and Operational Risk
Operational risks arising from, among other problems, human errors, systems and technology disruptions or failures, or cybersecurity incidents may negatively impact the Fund and its service providers as well as the ability of shareholders to transact in the Fund’s shares, and result in financial losses. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets, shareholder data, or proprietary information, or cause the Fund or its service providers, as well as securities trading venues and their service providers, to suffer data corruption or lose operational functionality. Cybersecurity incidents can result from deliberate attacks or unintentional events. 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. The Fund cannot control the cybersecurity plans and systems of its service providers, its counterparties or the issuers of securities in which the Fund invests. The issuers of the Fund’s investments are likely to be dependent on computers for their operations and require ready access to their data and the internet to conduct their business. Thus, cybersecurity incidents could also affect issuers of the Fund’s investments, leading to significant loss of value.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Foreign Exposure Risk [Member]

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Equity Investments Risk
Equity securities are subject to investment risk, issuer risk and market risk. In general, the values of stocks and other equity securities fluctuate, and sometimes widely fluctuate, in response to changes in a company’s financial condition as well as general market, economic and political conditions and other factors. The Fund may experience a significant or complete loss on its investment in an equity security. In addition, stock prices may be particularly sensitive to rising interest rates, which increase borrowing costs and the costs of capital. The Fund may invest in the following equity securities, which may expose the Fund to the following additional risks:

■

Common Stock Risk. 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.

■

U.S. Dollar-Denominated Foreign Stocks Traded on U.S. Exchanges Risk. Foreign (non-U.S.) companies that list their stocks on U.S. exchanges may be exempt from certain accounting and corporate governance standards that apply to U.S. companies that list on the same exchange. Performance of these stocks can be impacted by political and financial instability in the home country of a particular foreign company, and delisting of these stocks could impact the Fund‘s ability to transact in such securities and could significantly impact their liquidity and market price.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Growth Companies Risk [Member]

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Foreign Exposure Risk
Exposure to non-U.S. issuers carries potential risks not associated with exposure to U.S. issuers. Such risks may 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) greater volatility, (6) different government regulation and supervision of foreign stock exchanges, brokers and listed companies, and (7) delays or failures in transaction payment and settlement in some foreign markets. The Fund’s exposure to a foreign issuer may subject the Fund to regulatory, political, currency, security, economic and other risks associated with that country. Global economic and financial markets have become increasingly interconnected and conditions (including recent volatility, terrorism, war and political instability) and events (including natural disasters) in one country, region or financial market may adversely impact issuers in a different country, region or financial market.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Investment Risk [Member]

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Growth Companies Risk
Growth companies are expected to increase their earnings at a certain rate. When these expectations are not met or decrease, the prices of these stocks may decline, sometimes sharply, even if earnings showed an absolute increase. The Fund’s investments in growth companies may be more sensitive to company earnings and more volatile than the market in general primarily because their stock prices are based heavily on future expectations. If an assessment of the prospects for a company’s growth is incorrect, then the price of the company’s stock may fall or not approach the value placed on it. Growth company stocks may also lack the dividend yield that can cushion stock price declines in market downturns.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Issuer Risk [Member]

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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.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Large-Capitalization Companies Risk [Member]

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Issuer Risk
The value of, and/or the return generated by, a security may decline for a number of reasons that 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.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Market Risk [Member]

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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, at times, such companies may be out of favor with investors. Many larger-capitalization companies also may be unable to attain the high growth rates of successful smaller companies, especially during periods of economic expansion.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Mid-Capitalization Companies Risk [Member]

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Market Risk
The Fund is subject to the risk that the securities markets will move down, sometimes rapidly and unpredictably, based on overall economic conditions and other factors, which may negatively affect the Fund’s performance. Equity securities generally have greater price volatility than fixed-income securities, although under certain market conditions fixed-income securities may have comparable or greater price volatility. During a general downturn in the securities markets, multiple assets may decline in value simultaneously. Prices in many financial markets have increased significantly over the last decade, but there have also been periods of adverse market and financial developments and cyclical change during that timeframe, which have resulted in unusually high levels of volatility in domestic and foreign financial markets that has caused losses for investors and may occur again in the future. The value of a security may decline due to adverse issuer-specific conditions, general market conditions unrelated to a particular issuer, such as changes in interest or inflation rates, or factors that affect a particular industry or industries. Changes in the financial condition of a single issuer or market segment also can impact the market as a whole. Geopolitical and other events, including war, terrorism, economic uncertainty, trade disputes, pandemics, public health crises, natural disasters and related events have led, and in the future may continue to lead, to instability in world economies and markets generally and reduced liquidity in equity, credit and fixed-income markets, which may disrupt economies and markets and adversely affect the value of your investment. Changes in value may be temporary or may last for extended periods.

Policy changes by the U.S. government and/or Federal Reserve and political events within the U.S. and abroad, such as changes in the U.S. presidential administration and Congress, the U.S. government’s inability at times to agree on a long-term budget and deficit reduction plan, the threat or occurrence of a federal government shutdown and threats or the occurrence of a failure to increase the federal government’s debt limit, which could result in a default on the government’s obligations, may affect investor and consumer confidence and may adversely impact financial markets and the broader economy, perhaps suddenly and to a significant degree.

Markets and market participants are increasingly reliant upon both publicly available and proprietary information data systems. Data imprecision, software or other technology malfunctions, programming inaccuracies, unauthorized use or access, and similar circumstances may impair the performance of these systems and may have an adverse impact upon a single issuer, a group of issuers, or the market at large.

The financial markets generally move in cycles, with periods of rising prices followed by periods of declining prices. The value of your investment may reflect these fluctuations.

■

Recent Market Events Risk. Both U.S. and international markets have experienced significant volatility in recent months and years. As a result of such volatility, investment returns may fluctuate significantly. Moreover, the risks discussed herein associated with an investment in the Fund may be increased.

Although interest rates were unusually low in recent years in the U.S. and abroad, in 2022, the Federal Reserve and certain foreign central banks began to raise interest rates as part of their efforts to address rising inflation. It is difficult to accurately predict the pace at which interest rates might increase or start decreasing, the timing, frequency or magnitude of any such changes in interest rates, or when such changes might stop or reverse course. Additionally, various economic and political factors could cause the Federal Reserve or another foreign central bank to change their approach in the future and such actions may result in an economic slowdown in the U.S. and abroad. Unexpected changes in interest rates could lead to significant market volatility or reduce liquidity in certain sectors of the market. Deteriorating economic fundamentals may, in turn, increase the risk of default or insolvency of particular issuers, negatively impact market value, cause credit spreads to widen, and reduce bank balance sheets. Any of these could cause an increase in market volatility, reduce liquidity across various markets or decrease confidence in the markets. Additionally, high public debt in the U.S. and other countries creates ongoing systemic and market risks and policymaking uncertainty.

In March 2023, the shutdown of certain financial institutions in the U.S. and questions regarding the viability of other financial institutions raised economic concerns over disruption in the U.S. and global banking systems. There can be no certainty that the actions taken by the U.S. or foreign governments will be effective in mitigating the effects of financial institution failures on the economy and restoring public confidence in the U.S. and global banking systems.

Some countries, including the U.S., have in recent years adopted more protectionist trade policies. Slowing global economic growth; risks associated with a trade agreement between the United Kingdom and the European Union; the risks associated with ongoing trade negotiations with China; and the possibility of changes to some international trade agreements; political or economic dysfunction within some nations, including major producers of oil; and dramatic changes in commodity and currency prices could have adverse effects that cannot be foreseen at the present time.

Tensions, war, or open conflict between nations, such as between Russia and Ukraine, in the Middle East or in eastern Asia could affect the economies of many nations, including the United States. The duration of ongoing hostilities in the Middle East and between Russia and Ukraine, and any sanctions and related events cannot be predicted. Those events present material uncertainty and risk with respect to markets globally and the performance of the Fund and its investments or operations could be negatively impacted.

Regulators in the U.S. have proposed and recently adopted a number of changes to regulations involving the markets and issuers, some of which apply to the Fund. The full effect of various newly-adopted regulations is not currently known. Additionally, it is not clear whether the proposed regulations will be adopted. However, due to the broad scope of the new and proposed regulations, certain changes could limit the Fund’s ability to pursue its investment strategies or make certain investments, or may make it more costly for the Fund to operate, which may impact performance.

Economists and others have expressed increasing concern about the potential effects of global climate change on property and security values. Certain issuers, industries and regions may be adversely affected by the impacts of climate change, including on the demand for and the development of goods and services and related production costs, and the impacts of legislation, regulation and international accords related to climate change, as well as any indirect consequences of regulation or business trends driven by climate change.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Other Investment Companies Risk [Member]

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Mid-Capitalization Companies Risk
Investing in the securities of mid-capitalization companies involves greater risk and the possibility of greater price volatility, which at times can be rapid and unpredictable, than investing in larger-capitalization and more established companies. Since 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 changes in overall economic conditions, interest rates, borrowing costs and earnings.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Redemption Risk [Member]

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Other Investment Companies Risk
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. To the extent the Fund invests in other investment companies that invest in equity securities, fixed-income securities and/or foreign securities, or that track an index, the Fund is subject to the risks associated with the underlying investments held by the investment company or the index fluctuations to which the investment company is subject. The Fund will be subject to the risks associated with investments in those companies, including but not limited to the following:

■

Government Money Market Funds Risk. Investments in government money market funds are subject to interest rate risk, credit risk, and market risk. Interest rate risk is the risk that rising interest rates could cause the value of such an investment to decline. Credit risk is the risk that the issuer, guarantor or insurer of an obligation, or the counterparty to a transaction, may fail or become less able or unwilling, to make timely payment of interest or principal or otherwise honor its obligations, or that it may default completely.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Sector Risk [Member]

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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. Heavy redemptions could hurt the Fund’s performance. 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 greater to the extent that one or more investors or intermediaries control a large percentage of investments in the Fund. In addition, redemption risk is heightened during periods of declining or illiquid markets. During periods of heavy redemptions, the Fund may borrow funds through the interfund credit facility or from a bank line of credit, which may increase costs.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Securities Lending Risk [Member]

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Sector Risk
When the Fund focuses its investments in certain sectors of the economy, its performance could fluctuate more widely than if the Fund were invested more evenly across sectors. Issuers in the same economic sector may be similarly affected by economic or market events, making the Fund more vulnerable to unfavorable developments in that economic sector than funds that invest more broadly. Additionally, individual sectors may be more volatile, and may perform differently, than the broader market. As the Fund’s portfolio changes over time, the Fund’s exposure to a particular sector may become higher or lower.

■

Information Technology Sector Risk. The Information Technology sector includes companies engaged in software and services, technology hardware and storage peripherals, electronic equipment and components, and semiconductors and semiconductor equipment. Information technology companies face intense competition, both domestically and internationally, which may have an adverse effect on profit margins. Information technology companies may have limited product lines, markets, financial resources or personnel. The products of information technology companies may face rapid product obsolescence due to technological developments and frequent new product introduction, unpredictable changes in growth rates and competition for the services of qualified personnel. Failure to introduce new products, develop and maintain a loyal customer base or achieve general market acceptance for their products could have a material adverse effect on a company’s business. Companies in the Information Technology sector also may be subject to increased government scrutiny or adverse government or regulatory action. Additionally, companies in the Information Technology sector are heavily dependent on intellectual property and the loss of patent, copyright or trademark protections may adversely affect the profitability of these companies. The market prices of information technology-related securities tend to exhibit a greater degree of market risk and sharp price fluctuations than other types of securities. These securities may fall in and out of favor with investors rapidly, which may cause sudden selling and dramatically lower market prices.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Securities Selection Risk [Member]

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Securities Lending Risk
To the extent the Fund lends its securities, it may be subject to the following risks: (i) the securities in which the Fund reinvests cash collateral may decrease in value, causing the Fund to incur a loss, or may not perform sufficiently to cover the Fund’s payment to the borrower of a pre-negotiated fee or “rebate” for the use of that cash collateral in connection with the loan; (ii) non-cash collateral may decline in value, resulting in the Fund becoming under-secured; (iii) delays may occur in the recovery of loaned securities from borrowers, which could result in the Fund being unable to vote proxies or settle transactions or cause the Fund to incur increased costs; and (iv) if the borrower becomes subject to insolvency or similar proceedings, the Fund could incur delays in its ability to enforce its rights in its collateral.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Small-Capitalization Companies Risk [Member]

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Securities Selection Risk
Securities selected for the Fund may not perform to expectations. This could result in the Fund’s underperformance compared to its performance index(es), or other funds with similar investment objectives or strategies.

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(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Russell Midcap® Growth Index (Reflects no deduction for fees, expenses, or taxes)

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Small-Capitalization Companies Risk
Investing in the securities of small-capitalization companies involves greater risk and the possibility of greater price volatility, which at times can be rapid and unpredictable, than investing in larger-capitalization and more established companies. Since small-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 changes in overall economic conditions, interest rates, borrowing costs and earnings.

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rr_AverageAnnualReturnYear01

25.87%

rr_AverageAnnualReturnYear05

13.81%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | A Class

rr_AverageAnnualReturnYear10

10.57%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

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rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

rr_MaximumDeferredSalesChargeOverOther

0.50%

^[1]

rr_ManagementFeesOverAssets

0.80%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.35%

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

1.41%

^[2]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.20%)

^[3]

rr_NetExpensesOverAssets

1.21%

rr_ExpenseExampleYear01

$ 691

rr_ExpenseExampleYear03

964

rr_ExpenseExampleYear05

1,271

rr_ExpenseExampleYear10

$ 2,141

rr_AverageAnnualReturnYear01

17.97%

rr_AverageAnnualReturnYear05

11.74%

rr_AverageAnnualReturnYear10

9.34%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | C Class

rr_AverageAnnualReturnInceptionDate

Feb. 24, 2012

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

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rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_ManagementFeesOverAssets

0.80%

rr_DistributionAndService12b1FeesOverAssets

1.00%

rr_OtherExpensesOverAssets

0.17%

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

1.98%

^[2]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[3]

rr_NetExpensesOverAssets

1.95%

rr_ExpenseExampleYear01

$ 298

rr_ExpenseExampleYear03

616

rr_ExpenseExampleYear05

1,063

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleYear10

2,302

rr_ExpenseExampleNoRedemptionYear01

198

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

616

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,063

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,302

rr_AverageAnnualReturnYear01

23.24%

rr_AverageAnnualReturnYear05

12.23%

rr_AverageAnnualReturnYear10

9.33%

^[4]

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Y Class

rr_AverageAnnualReturnInceptionDate

Feb. 24, 2012

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.80%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.19%

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

1.00%

^[2]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.04%)

^[3]

rr_NetExpensesOverAssets

0.96%

rr_ExpenseExampleYear01

$ 97

rr_ExpenseExampleYear03

311

rr_ExpenseExampleYear05

545

rr_ExpenseExampleYear10

$ 1,217

rr_AverageAnnualReturnYear01

25.51%

rr_AverageAnnualReturnYear05

13.36%

rr_AverageAnnualReturnYear10

10.29%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | R6 Class

rr_AverageAnnualReturnInceptionDate

Feb. 24, 2012

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.80%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.09%

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

0.90%

^[2]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[3]

rr_NetExpensesOverAssets

0.89%

rr_ExpenseExampleYear01

$ 91

rr_ExpenseExampleYear03

285

rr_ExpenseExampleYear05

497

rr_ExpenseExampleYear10

$ 1,106

rr_AverageAnnualReturnYear01

25.56%

rr_AverageAnnualReturnYear05

13.46%

rr_AverageAnnualReturnYear10

10.40%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | R5 Class

rr_AverageAnnualReturnInceptionDate

Dec. 31, 2018

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.80%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.10%

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

0.91%

^[2]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.01%)

^[3]

rr_NetExpensesOverAssets

0.90%

rr_ExpenseExampleYear01

$ 91

rr_ExpenseExampleYear03

287

rr_ExpenseExampleYear05

501

rr_ExpenseExampleYear10

$ 1,117

rr_AverageAnnualReturnYear01

25.55%

rr_AverageAnnualReturnYear05

13.44%

rr_AverageAnnualReturnYear10

10.39%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Investor Class

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2006

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.80%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.42%

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

1.23%

^[2]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.07%)

^[3]

rr_NetExpensesOverAssets

1.16%

rr_ExpenseExampleYear01

$ 118

rr_ExpenseExampleYear03

379

rr_ExpenseExampleYear05

664

Highest Quarterly Return, Label

rr_ExpenseExampleYear10

$ 1,478

Annual Return 2014

rr_AnnualReturn2014

2.97%

Annual Return 2015

rr_AnnualReturn2015

(1.63%)

Annual Return 2016

rr_AnnualReturn2016

6.42%

Annual Return 2017

rr_AnnualReturn2017

27.97%

Annual Return 2018

rr_AnnualReturn2018

1.91%

Annual Return 2019

rr_AnnualReturn2019

31.28%

Annual Return 2020

rr_AnnualReturn2020

39.80%

Annual Return 2021

rr_AnnualReturn2021

12.20%

Annual Return 2022

rr_AnnualReturn2022

(28.28%)

Annual Return 2023

rr_AnnualReturn2023

25.22%

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return:34.11%2nd Quarter 202001/01/2014 through 12/31/2023

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

34.11%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return:-20.89%2nd Quarter 202201/01/2014 through 12/31/2023

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(20.89%)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2022

rr_AverageAnnualReturnYear01

25.22%

rr_AverageAnnualReturnYear05

13.09%

rr_AverageAnnualReturnYear10

10.03%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Investor Class | Returns After Taxes on Distributions

rr_AverageAnnualReturnInceptionDate

Feb. 01, 2006

rr_ProspectusTable

rr_AverageAnnualReturnYear01

25.22%

rr_AverageAnnualReturnYear05

12.26%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Mid-Cap Growth Fund) | Investor Class | Returns After Taxes on Distributions and Sales of Fund Shares

rr_AverageAnnualReturnYear10

8.78%

rr_ProspectusTable

rr_AverageAnnualReturnYear01

14.93%

rr_AverageAnnualReturnYear05

10.45%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund)

rr_AverageAnnualReturnYear10

7.88%

Objective, Primary [Text Block]

rr_ProspectusTable

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

rr_ObjectivePrimaryTextBlock

The Fund seeks long-term growth of capital.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

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

December 31, 2025

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

Assuming no redemption of shares:

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

15.00%

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of small capitalization companies. The Fund considers a company to be a small capitalization company if it has a market capitalization (stock market worth), at the time of investment, similar to the market capitalizations of the companies in the Russell 2000^® Index. The capitalization range of that index is subject to change over time due to market activity or changes in the composition of the index. As of March 31, 2024, the market capitalizations of the companies in the Russell 2000 Index ranged from $11.7 million to $58.4 billion. The Fund may also invest in micro-capitalization and mid-capitalization companies.

Most of the assets of the Fund are invested in U.S. common stocks the sub-advisor, Stephens Investment Management Group, LLC (“SIMG”), believes have clear indicators of future earnings growth, or that demonstrate other potential for growth of capital. The Fund may invest in other securities, including master limited partnerships (“MLPs”) and U.S. dollar-denominated foreign stock traded on U.S. exchanges. In selecting companies for the Fund, SIMG primarily employs fundamental research with a focus on earnings growth. SIMG will sell a security when appropriate and consistent with the Fund’s investment objectives and policies.

Risk [Heading]

rr_RiskHeading

Principal Risks

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Fund Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The chart and the table show the performance of the Fund’s Investor Class shares for all periods. In the table below, for the period prior to April 30, 2019, the performance for the Fund’s R6 Class shares reflects the returns of the Fund’s R5 Class shares. The R6 Class shares would have had similar annual returns to the R5 Class shares because the shares of each class represent investments in the same portfolio securities. However, as reflected in the “Fees and Expenses of the Fund” section of this Fund Summary, the expenses of the R5 Class shares differ from those of the R6 Class shares, which would affect performance. To the extent that the Fund’s R5 Class shares may have had lower expenses than the R6 Class shares prior to April 30, 2019, the performance of the R5 Class shares would likely have been higher than the performance the R6 Class shares would have realized during the same period. The performance of the R6 Class shares shown in the table has not been adjusted for differences in operating expenses between that share class and the R5 Class shares.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

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. Year Ended 12/31

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

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown only for Investor Class shares of the Fund; after-tax returns for other share classes will vary.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Return:
37.56%2nd Quarter 2020
01/01/2014 through 12/31/2023

Lowest Quarterly Return:
-22.26%1st Quarter 2020
01/01/2014 through 12/31/2023

Performance Table Heading

rr_PerformanceTableHeading

Average annual total returns for periods ended December 31, 2023

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Cybersecurity and Operational Risk [Member]

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Equity Investments Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Foreign Exposure Risk [Member]

rr_RiskTextBlock

■

Master Limited Partnerships (“MLPs”) Risk. Investing in MLPs involves certain risks related to investing in the underlying assets of the MLPs and risks associated with pooled investment vehicles. Investments held by MLPs may be relatively illiquid, limiting the MLPs’ ability to change their portfolios promptly in response to changes in economic or other conditions. MLPs may have limited financial resources, their securities may trade infrequently and in limited volume, they may be difficult to value, and they may be subject to more abrupt or erratic price movements than securities of larger or more broadly based companies. Holders of units in MLPs have more limited rights to vote on matters affecting the partnership and may be required to sell their common units at an undesirable time or price. The Fund’s investments in MLPs will be limited to no more than 25% of its assets in order for the Fund to meet the requirements necessary to qualify as a “regulated investment company” under the Internal Revenue Code of 1986, as amended (“Internal Revenue Code”).

■

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Growth Companies Risk [Member]

rr_RiskTextBlock

greater volatility, (6) different government regulation and supervision of foreign stock exchanges, brokers and listed companies, and (7) delays or failures in transaction payment and settlement in some foreign markets. The Fund’s exposure to a foreign issuer may subject the Fund to regulatory, political, currency, security, economic and other risks associated with that country. Global economic and financial markets have become increasingly interconnected and conditions (including recent volatility, terrorism, war and political instability) and events (including natural disasters) in one country, region or financial market may adversely impact issuers in a different country, region or financial market.

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Investment Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Issuer Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Market Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Mid-Capitalization Companies Risk [Member]

rr_RiskTextBlock

The financial markets generally move in cycles, with periods of rising prices followed by periods of declining prices. The value of your investment may reflect these fluctuations.

■

adopted. However, due to the broad scope of the new and proposed regulations, certain changes could limit the Fund’s ability to pursue its investment strategies or make certain investments, or may make it more costly for the Fund to operate, which may impact performance.

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Other Investment Companies Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Redemption Risk [Member]

rr_RiskTextBlock

■

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Sector Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Securities Lending Risk [Member]

rr_RiskTextBlock

■

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Securities Selection Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Small-Capitalization Companies Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Micro-Capitalization Companies Risk [Member]

rr_RiskTextBlock

rr_ProspectusTable

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Russell 2000® Growth Index (Reflects no deduction for fees, expenses, or taxes)

rr_RiskTextBlock

Micro-Capitalization Companies Risk
Micro-capitalization companies are subject to substantially greater risks of loss and price fluctuations, sometimes rapidly and unpredictably, because their earnings and revenues tend to be less predictable. Since micro-capitalization companies may not have an operating history, product lines, or financial resources, their share prices tend to be more volatile and their markets less liquid than companies with larger market capitalizations, and they can be sensitive to changes in overall economic conditions, interest rates, borrowing costs and earnings. The shares of micro-capitalization companies tend to trade less frequently than those of larger, more established companies, which can adversely affect the pricing of these securities and the future ability to sell these securities.

rr_ProspectusTable

rr_AverageAnnualReturnYear01

18.66%

rr_AverageAnnualReturnYear05

9.22%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | A Class

rr_AverageAnnualReturnYear10

7.16%

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

rr_MaximumDeferredSalesChargeOverOther

0.50%

^[5]

rr_ManagementFeesOverAssets

0.92%

rr_DistributionAndService12b1FeesOverAssets

0.25%

rr_OtherExpensesOverAssets

0.31%

^[6]

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

1.49%

^[7]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.20%)

^[8]

rr_NetExpensesOverAssets

1.29%

rr_ExpenseExampleYear01

$ 698

rr_ExpenseExampleYear03

987

rr_ExpenseExampleYear05

1,311

rr_ExpenseExampleYear10

$ 2,225

rr_AverageAnnualReturnYear01

12.37%

rr_AverageAnnualReturnYear05

8.94%

rr_AverageAnnualReturnYear10

6.56%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | C Class

rr_AverageAnnualReturnInceptionDate

Feb. 24, 2012

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

1.00%

rr_ManagementFeesOverAssets

0.92%

rr_DistributionAndService12b1FeesOverAssets

1.00%

rr_OtherExpensesOverAssets

0.24%

^[6]

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

2.17%

^[7]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.10%)

^[8]

rr_NetExpensesOverAssets

2.07%

rr_ExpenseExampleYear01

$ 310

rr_ExpenseExampleYear03

663

rr_ExpenseExampleYear05

1,149

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleYear10

2,490

rr_ExpenseExampleNoRedemptionYear01

210

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

663

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,149

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 2,490

rr_AverageAnnualReturnYear01

17.22%

^[9]

rr_AverageAnnualReturnYear05

9.10%

^[9]

rr_AverageAnnualReturnYear10

6.89%

^[9],[10]

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Y Class

rr_AverageAnnualReturnInceptionDate

Feb. 24, 2012

^[9]

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.92%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.21%

^[6]

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

1.14%

^[7]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.08%)

^[8]

rr_NetExpensesOverAssets

1.06%

rr_ExpenseExampleYear01

$ 108

rr_ExpenseExampleYear03

349

rr_ExpenseExampleYear05

614

rr_ExpenseExampleYear10

$ 1,374

rr_AverageAnnualReturnYear01

19.42%

rr_AverageAnnualReturnYear05

10.49%

rr_AverageAnnualReturnYear10

7.47%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | R6 Class

rr_AverageAnnualReturnInceptionDate

Feb. 24, 2012

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.92%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.13%

^[6]

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

1.06%

^[7]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.09%)

^[8]

rr_NetExpensesOverAssets

0.97%

rr_ExpenseExampleYear01

$ 98

rr_ExpenseExampleYear03

322

rr_ExpenseExampleYear05

570

rr_ExpenseExampleYear10

$ 1,280

rr_AverageAnnualReturnYear01

19.46%

rr_AverageAnnualReturnYear05

10.59%

rr_AverageAnnualReturnYear10

7.56%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | R5 Class

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2019

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.92%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.17%

^[6]

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

1.10%

^[7]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.10%)

^[8]

rr_NetExpensesOverAssets

1.00%

rr_ExpenseExampleYear01

$ 102

rr_ExpenseExampleYear03

333

rr_ExpenseExampleYear05

590

rr_ExpenseExampleYear10

$ 1,325

rr_AverageAnnualReturnYear01

19.51%

rr_AverageAnnualReturnYear05

10.56%

rr_AverageAnnualReturnYear10

7.55%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Investor Class

rr_AverageAnnualReturnInceptionDate

Aug. 31, 2006

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_ProspectusTable

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

rr_MaximumDeferredSalesChargeOverOther

none

rr_ManagementFeesOverAssets

0.92%

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

0.40%

^[6]

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpensesOverAssets

1.33%

^[7]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.05%)

^[8]

rr_NetExpensesOverAssets

1.28%

rr_ExpenseExampleYear01

$ 130

rr_ExpenseExampleYear03

413

rr_ExpenseExampleYear05

721

Highest Quarterly Return, Label

rr_ExpenseExampleYear10

$ 1,594

Annual Return 2014

rr_AnnualReturn2014

(3.35%)

Annual Return 2015

rr_AnnualReturn2015

(5.08%)

Annual Return 2016

rr_AnnualReturn2016

9.76%

Annual Return 2017

rr_AnnualReturn2017

19.23%

Annual Return 2018

rr_AnnualReturn2018

2.93%

Annual Return 2019

rr_AnnualReturn2019

22.49%

Annual Return 2020

rr_AnnualReturn2020

37.18%

Annual Return 2021

rr_AnnualReturn2021

13.93%

Annual Return 2022

rr_AnnualReturn2022

(28.74%)

Annual Return 2023

rr_AnnualReturn2023

19.18%

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return:37.56%2nd Quarter 202001/01/2014 through 12/31/2023

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

37.56%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return:-22.26%1st Quarter 202001/01/2014 through 12/31/2023

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.26%)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

rr_AverageAnnualReturnYear01

19.18%

rr_AverageAnnualReturnYear05

10.21%

rr_AverageAnnualReturnYear10

7.23%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Investor Class | Returns After Taxes on Distributions

rr_AverageAnnualReturnInceptionDate

Dec. 01, 2005

rr_ProspectusTable

rr_AverageAnnualReturnYear01

18.76%

rr_AverageAnnualReturnYear05

7.33%

(American Beacon Stephens Funds - Classes A, C, Y, R6, R5 and Investor) | (American Beacon Stephens Small Cap Growth Fund) | Investor Class | Returns After Taxes on Distributions and Sales of Fund Shares

rr_AverageAnnualReturnYear10

4.65%

rr_ProspectusTable

rr_AverageAnnualReturnYear01

11.66%

rr_AverageAnnualReturnYear05

8.06%