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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000809593
American Beacon Treasury Inflation Protected Securities Fund | American Beacon Treasury Inflation Protected Securities Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

American Beacon Treasury Inflation Protected Securities Fund
Risk/Return Supplement [Text Block] ck0000809593_SupplementTextBlock

American Beacon Treasury Inflation Protected Securities Fund

 

Supplement dated June 30, 2014
to the
Prospectus dated April 30, 2014

 

Effective July 1, 2014, American Beacon Advisors, Inc.(“Manager”) will reduce the administrative service fee charged to the Fund's A Class and C Class shares from 0.40% to 0.30% of each Class's average daily net assets. At that time, the contractual fee limit for the A Class and C Class shares also will be reduced by 0.10%. The information below supplements the Fund's Prospectus dated April 30, 2014, and is in addition to any other supplement(s):
Expense [Heading] rr_ExpenseHeading

Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

In the “Fees and Expenses of the Fund” section, the fee table and expense example are replaced with the following:
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 2015-04-30
Expense Example [Heading] rr_ExpenseExampleHeading

Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption

Assuming no redemption of shares:
Supplement Closing [Text Block] ck0000809593_SupplementClosingTextBlock

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE
American Beacon Treasury Inflation Protected Securities Fund | American Beacon Treasury Inflation Protected Securities Fund | A Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 0.50% [1]
Management fees rr_ManagementFeesOverAssets 0.11% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25% [2]
Other Expenses rr_OtherExpensesOverAssets 0.60% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.96% [2]
Fee waiver and/or expense reimbursement ck0000809593_FeeWaiverOrReimbursement (0.06%) [2]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.90% [2],[3]
1 year rr_ExpenseExampleYear01 $ 563
3 years rr_ExpenseExampleYear03 761
5 years rr_ExpenseExampleYear05 975
10 years rr_ExpenseExampleYear10 1,591
American Beacon Treasury Inflation Protected Securities Fund | American Beacon Treasury Inflation Protected Securities Fund | C Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.11% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00% [2]
Other Expenses rr_OtherExpensesOverAssets 0.58% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.69% [2]
Fee waiver and/or expense reimbursement ck0000809593_FeeWaiverOrReimbursement (0.01%) [2]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.68% [2],[3]
1 year rr_ExpenseExampleYear01 271
3 years rr_ExpenseExampleYear03 532
5 years rr_ExpenseExampleYear05 917
10 years rr_ExpenseExampleYear10 1,997
1 year rr_ExpenseExampleNoRedemptionYear01 171
3 years rr_ExpenseExampleNoRedemptionYear03 532
5 years rr_ExpenseExampleNoRedemptionYear05 917
10 years rr_ExpenseExampleNoRedemptionYear10 1,997
American Beacon Treasury Inflation Protected Securities Fund | American Beacon Treasury Inflation Protected Securities Fund | Y Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.11% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [2]
Other Expenses rr_OtherExpensesOverAssets 0.52% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.63% [2]
Fee waiver and/or expense reimbursement ck0000809593_FeeWaiverOrReimbursement (0.02%) [2]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.61% [2],[3]
1 year rr_ExpenseExampleYear01 62
3 years rr_ExpenseExampleYear03 199
5 years rr_ExpenseExampleYear05 348
10 years rr_ExpenseExampleYear10 784
American Beacon Treasury Inflation Protected Securities Fund | American Beacon Treasury Inflation Protected Securities Fund | Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.11% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [2]
Other Expenses rr_OtherExpensesOverAssets 0.29% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.40% [2]
Fee waiver and/or expense reimbursement ck0000809593_FeeWaiverOrReimbursement 0.10% [2],[4]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.30% [2],[3]
1 year rr_ExpenseExampleYear01 31
3 years rr_ExpenseExampleYear03 119
5 years rr_ExpenseExampleYear05 215
10 years rr_ExpenseExampleYear10 496
American Beacon Treasury Inflation Protected Securities Fund | American Beacon Treasury Inflation Protected Securities Fund | Investor Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (as a percentage of the lower of original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.11% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [2]
Other Expenses rr_OtherExpensesOverAssets 0.68% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.79% [2]
Fee waiver and/or expense reimbursement ck0000809593_FeeWaiverOrReimbursement (0.10%) [2]
Total Annual Fund Operating Expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.69% [2],[3]
1 year rr_ExpenseExampleYear01 70
3 years rr_ExpenseExampleYear03 242
5 years rr_ExpenseExampleYear05 428
10 years rr_ExpenseExampleYear10 $ 969
[1] 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.
[2] The fee table has been restated with respect to the Fund's A Class and C Class Shares to reflect a reduction in the administrative services fee effective July 1, 2014.
[3] The Manager has contractually agreed to reduce and/or reimburse the A Class, C Class, Y Class and Investor Class of the Fund for Other Expenses, as applicable, through April 30, 2015 to the extent that Total Annual Fund Operating Expenses exceed 0.90% for the A Class, 1.68% for the C Class, 0.61% for the Y Class and 0.69% for the Investor Class (excluding taxes, brokerage commissions, acquired fund fees and expenses and other extraordinary expenses such as litigation). The contractual expense reimbursement can be changed only with the approval of a majority of the Fund's Board of Trustees. The Manager can be reimbursed by the Fund for any contractual reductions or expense reimbursements if reimbursement to the Manager (a) occurs within three years after the Manager's own reduction or reimbursement and (b) does not cause the Total Annual Fund Operating Expenses of a class to exceed the contractual percentage limit.
[4] The Manager has contractually agreed to reduce administrative services fees for the Institutional Class in an amount equal to 0.10% of the average daily net assets of that class through April 30, 2015. The administrative services fee reduction can be changed only with the approval of the Fund's Board of Trustees. The Manager can be reimbursed by the Fund for any contractual or voluntary fee reductions or expense reimbursements if reimbursement to the Manager (a) occurs within three years after the Manager's own reduction or reimbursement and (b) does not cause the Expense Reduction and Reimbursement of a class to exceed the percentage limit contractually agreed.