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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Oct. 31, 2010
Registrant Name dei_EntityRegistrantName AMERICAN BEACON FUNDS
Central Index Key dei_EntityCentralIndexKey 0000809593
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Sep. 16, 2011
Document Effective Date dei_DocumentEffectiveDate Sep. 16, 2011
Prospectus Date rr_ProspectusDate Mar. 01, 2011
Supplement [Text Block] abf809593_SupplementTextBlock
American Beacon FUNDSSM
American Beacon Balanced Fund
American Beacon Large Cap Value Fund
American Beacon Large Cap Growth Fund
American Beacon Mid-Cap Value Fund
American Beacon Small Cap Value Fund
American Beacon International Equity Fund
American Beacon Emerging Markets Fund
American Beacon High Yield Bond Fund
 
Supplement Dated September 16, 2011
To the Prospectus dated March 1, 2011
 
 
American Beacon High Yield Bond Fund | Class AMR
 
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] abf809593_SupplementTextBlock

The information below supplements the Prospectus dated March 1, 2011, and is in addition to any other supplements.

High Yield Bond Fund

On August 10, 2011, the American Beacon Funds’ Board of Trustees approved the appointment of PENN Capital Management Company, Inc. (“PENN”) as a sub-advisor to the American Beacon High Yield Bond Fund. PENN will begin managing assets of the Fund on September 16, 2011. The information below supplements the prospectus to reflect the addition of PENN as a sub-advisor.

In the “Fees and Expenses of the Fund” section, the Annual Fund Operating Expenses table is restated with the following table:

Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
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)
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Fund's Financial Highlights table, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
Example rr_ExpenseExampleAbstract  
Supplement Expense Example [Text Block] abf809593_SupplementExpenseExampleTextBlock In the “Fees and Expenses of the Fund” section, the Example table is replaced with the following table:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Share classes
Supplement Strategy [Text Block] abf809593_SupplementStrategyTextBlock

In the “Principal Investment Strategies” section, the last sentence in the second paragraph is deleted and replaced with the following:

The Fund’s assets are currently allocated among the Manager and three investment sub-advisors.

American Beacon High Yield Bond Fund | Class AMR | AMR Class, American Beacon High Yield Bond Fund
 
Annual Fund Operating Expenses rr_OperatingExpensesAbstract  
Share classes rr_OperatingExpensesColumnName AMR
Management fees rr_ManagementFeesOverAssets 0.41%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.15%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total annual fund operating expenses rr_ExpensesOverAssets 0.57% [1]
Example rr_ExpenseExampleAbstract  
Share classes rr_ExpenseExampleByYearColumnName AMR
1 year rr_ExpenseExampleYear01 58
3 years rr_ExpenseExampleYear03 183
5 years rr_ExpenseExampleYear05 318
10 years rr_ExpenseExampleYear10 714
[1] 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.