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Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000809593
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

American Beacon Stephens Small Cap Growth Fund
Risk/Return Supplement [Text Block] ck0000809593_SupplementTextBlock

American Beacon Stephens Small Cap Growth Fund

American Beacon Stephens Mid-Cap Growth Fund

 

Supplement dated September 17, 2013

to the

Prospectus dated March 28, 2013

 

 

The information below supplements the Prospectus dated March 28, 2013 and is in addition to any other supplement(s):

 

American Beacon Stephens Small Cap Growth Fund

 

In the “Principal Investment Strategies” section, the first paragraph is deleted and replaced with the following:

 

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, 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 August 31, 2013, the market capitalizations of the companies in the Russell 2000 Index ranged from $47 million to $4.2 billion.

 

The “Fund Performance” section is deleted and replaced with the following:

 

American Beacon Stephens Small Cap Growth Fund

 

The bar chart and table below provide an indication of risk by showing how the Fund's performance has varied from year to year. The table shows how the Fund's performance compares to the Russell 2000® Growth Index, which is the Fund's primary benchmark and is a broad measure of market performance. In addition, the Fund's performance is compared to the Standard & Poor's Composite Stock Index (“S&P 500® Index”), which is the Fund's secondary index and is provided to offer a broader market perspective.

 

The Investor Class and Institutional Class shares of the Fund have adopted the performance history and financial statements of the Class A and Class I shares, respectively, of the Fund's predecessor. The performance of the Fund's Investor Class shares shown in the chart and table below represents the returns achieved by the Class A shares of the Fund's predecessor from December 1, 2005 to February 24, 2012 and the performance of the Fund's Investor Class shares from February 24, 2012 through December 31, 2012. The table below also shows the performance of the A Class, C Class, Y Class and Institutional Class shares of the Fund. The performance shown for the Institutional Class shares of the Fund represent the performance of the Class I shares from August 31, 2006 to February 24, 2012 and the performance of the Institutional Class shares from February 24, 2012 through December 31, 2012. Returns shown for the Fund's Y Class, A Class and C Class shares represent the returns achieved by the Class A shares of the Fund's predecessor from December 1, 2005 to February 24, 2012, and the performance of the Y Class, A Class and C Class shares, respectively, from February 24, 2012 through December 31, 2012. In each case, the newer share classes would have had similar annual returns to the predecessor Fund's Class A and Class I shares because the shares of each class represent investments in the same portfolio securities. However, because the Class A shares of the predecessor Fund had higher expenses than the Fund's Y Class shares now have, the total returns were lower than the Y Class shares would have realized had the Y Class shares been in existence since December 1, 2005. Since the Investor Class shares had lower expenses than the Fund's A Class and C Class shares now have, its performance was better than the performance of the A Class and C Class shares would have realized in the same period. The performance of the Fund and the Fund's predecessor shown in the bar chart below do not include sales charges. If sales charges were reflected, returns would be lower. You may obtain updated performance information on the Fund's website at www.americanbeaconfunds.com. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide an indication of risk by showing how the Fund’s performance has varied from year to year.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.americanbeaconfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading

Calendar year total returns for Investor Class shares Year-By-Year Percentage Returns as of 12/31 of each Year
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The performance of the Fund and the Fund’s predecessor shown in the bar chart below do not include sales charges. If sales charges were reflected, returns would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Highest Quarterly Return:                                                                        23.02%

        (12/1/05 through 12/31/12)                                                    (2nd Quarter 2009)

Lowest Quarterly Return:                                                                       -25.54%

        (12/1/05 through 12/31/12)                                                    (4th Quarter 2008)
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns For the periods ended December 31, 2012
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses or taxes
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred If you hold your Fund shares through a tax-deferred arrangement, such as an individual retirement account or a 401(k), the after-tax returns do not apply to your situation.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Investor Class shares; after-tax returns for other share classes will vary.
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund | Russell 2000® Growth Index
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel (reflects no deduction for fees, expenses or taxes) [1]
1 Year rr_AverageAnnualReturnYear01 14.59% [1]
5 Years rr_AverageAnnualReturnYear05 3.49% [1]
Since Inception rr_AverageAnnualReturnSinceInception 5.26% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2005 [1]
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund | Lipper Small-Cap Growth Funds Index
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel (reflects no deduction for fees, expenses or taxes) [1]
1 Year rr_AverageAnnualReturnYear01 14.95% [1]
5 Years rr_AverageAnnualReturnYear05 2.09% [1]
Since Inception rr_AverageAnnualReturnSinceInception 4.27% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2005 [1]
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund | S&P 500 Index
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel (reflects no deduction for fees, expenses or taxes) [1]
1 Year rr_AverageAnnualReturnYear01 16.00% [1]
5 Years rr_AverageAnnualReturnYear05 1.66% [1]
Since Inception rr_AverageAnnualReturnSinceInception 4.07% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2005 [1]
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund | Investor Class
  
Risk/Return: rr_RiskReturnAbstract  
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarterly Return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.02%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarterly Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.54%)
1 Year rr_AverageAnnualReturnYear01 15.92% [1]
5 Years rr_AverageAnnualReturnYear05 3.91% [1]
Since Inception rr_AverageAnnualReturnSinceInception 5.47% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2005 [1]
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund | Investor Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.81% [1]
5 Years rr_AverageAnnualReturnYear05 3.43% [1]
Since Inception rr_AverageAnnualReturnSinceInception 5.13% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2005 [1]
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund | Investor Class | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 11.81% [1]
5 Years rr_AverageAnnualReturnYear05 3.33% [1]
Since Inception rr_AverageAnnualReturnSinceInception 4.73% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 01, 2005 [1]
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund | A Class
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.07% [1]
5 Years rr_AverageAnnualReturnYear05 2.66% [1]
Since Inception rr_AverageAnnualReturnSinceInception 4.57% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 24, 2012 [1]
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund | C Class
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.04% [1]
5 Years rr_AverageAnnualReturnYear05 3.75% [1]
Since Inception rr_AverageAnnualReturnSinceInception 5.36% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 24, 2012 [1]
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund | Y Class
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.19% [1]
5 Years rr_AverageAnnualReturnYear05 3.96% [1]
Since Inception rr_AverageAnnualReturnSinceInception 5.51% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Feb. 24, 2012 [1]
American Beacon Stephens Small Cap Growth Fund | American Beacon Stephens Small Cap Growth Fund | Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.23% [1]
5 Years rr_AverageAnnualReturnYear05 4.17% [1]
Since Inception rr_AverageAnnualReturnSinceInception 6.79% [1],[2]
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2006 [1]
[1] After-tax returns are shown only for Investor Class shares; after-tax returns for other share classes will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. If you hold your Fund shares through a tax-deferred arrangement, such as an individual retirement account or a 401(k), the after-tax returns do not apply to your situation.
[2] Fund performance for the since inception period represents the returns achieved by the Institutional Class since its inception of August 31, 2006.