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

American Beacon Small Cap Index Fund
Supplement [Text Block] ck0000809593_SupplementTextBlock

Supplement dated July 16, 2014

to the

Prospectus dated April 30, 2014

 

The information below supplements the Fund's Prospectus dated April 30, 2014, and is in addition to any other supplement(s):
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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:
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)
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:
Supplement Closing [Text Block] ck0000809593_SupplementClosingTextBlock

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE
American Beacon Small Cap Index Fund | American Beacon Small Cap Index Fund | Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.01% [1]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other expenses rr_OtherExpensesOverAssets 0.16% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.06% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.23% [1]
1 Year rr_ExpenseExampleYear01 $ 24
3 Years rr_ExpenseExampleYear03 75
5 Years rr_ExpenseExampleYear05 130
10 Years rr_ExpenseExampleYear10 $ 294
[1] The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of the Small Cap Index Series ('Portfolio') of the Quantitative Master Series LLC.