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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Apr. 03, 2012
SIMT MULTI-ASSET ACCUMULATION FUND (Prospectus Summary): | SIMT MULTI-ASSET ACCUMULATION FUND
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Multi-Asset Accumulation Fund
Supplement Text ck0000804239_SupplementTextBlock

SEI INSTITUTIONAL MANAGED TRUST

Multi-Asset Accumulation Fund
Multi-Asset Income Fund

Supplement dated April 20, 2012
to the Class A Shares Prospectus dated April 3, 2012

This Supplement provides new and additional information beyond that contained in the Prospectus and should be read in conjunction with such Prospectus.

The Prospectus is hereby amended and supplemented to reflect the following changes in the fees and expenses of the Multi-Asset Accumulation and Multi-Asset Income Funds.

 
Expense, Heading rr_ExpenseHeading Change in Fees and Expenses for the Multi-Asset Accumulation Fund  
Expense, Narrative rr_ExpenseNarrativeTextBlock

Under the heading "Fees and Expenses," in the Fund Summary for the Multi-Asset Accumulation Fund, the "Annual Fund Operating Expenses" table and its footnote are hereby deleted and replaced with the following:

 
Operating Expenses, Caption rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)  
Other Expenses, New Fund, Based on Estimates rr_OtherExpensesNewFundBasedOnEstimates Based on estimated amounts for the current fiscal year.
Expense Example, Heading rr_ExpenseExampleHeading Under the same heading, the "Example" table is hereby deleted and replaced with the following:  
Expense Example, Closing rr_ExpenseExampleClosingTextBlock

There are no other changes to the fees and expenses for the Multi-Asset Accumulation Fund.

 
SupplementClosingTextBlock ck0000804239_Supplementclosingtextblock

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

 

SEI-F-781 (4/12)

 
SIMT MULTI-ASSET ACCUMULATION FUND | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees of the Fund rr_Component1OtherExpensesOverAssets 0.75%
Management Fees of the Subsidiary rr_Component2OtherExpensesOverAssets none
Total Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses of the Fund rr_OtherExpensesOverAssets 0.75% [1]
Other Expenses of the Subsidiary rr_Component3OtherExpensesOverAssets none
Total Other Expenses rr_ExpensesOverAssets 0.75%
Acquired Fund Fees and Expenses (AFFE) rr_AcquiredFundFeesAndExpensesOverAssets 0.06% [1]
Total Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.56%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 159
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 493
[1] Based on estimated amounts for the current fiscal year.