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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000835597_SupplementTextBlock

SEI INSTITUTIONAL INTERNATIONAL TRUST


Emerging Markets Equity Fund
International Fixed Income Fund
Emerging Markets Debt Fund


Supplement dated October 3, 2014
to the Class A Shares Prospectus (the "Prospectus")
dated January 31, 2014, as previously supplemented on July 7, 2014


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 Emerging Markets Equity Fund, International Fixed Income Fund and Emerging Market Debt Fund.


Changes to the Fees and Expenses of the Emerging Markets Equity Fund


In the Fund Summary for the Emerging Markets Equity Fund, under the heading "Fees and Expenses" (but excluding the sub-heading titled "Portfolio Turnover"), the text and tables are hereby deleted and replaced with the following:

Risk/Return [Heading] rr_RiskReturnHeading SIT EMERGING MARKETS EQUITY FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold Fund shares.

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 2016-01-31
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates AFFE is based on estimated amounts for the upcoming fiscal year.
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Expenses information in the table has been restated to reflect estimated fees and expenses for the upcoming fiscal year.
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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

There are no other changes to the Fees and Expenses of the Emerging Markets Equity Fund.


PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE

SIT EMERGING MARKETS EQUITY FUND - CLASS A
  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.25%)
Management Fees rr_ManagementFeesOverAssets 1.05% [1]
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other Expenses rr_OtherExpensesOverAssets 0.78% [1]
Acquired Fund Fees and Expenses (AFFE) rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.84% [1],[2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [1]
Total Annual Fund Operating Expenses Less Fee Waivers and Expense Reimbursements rr_NetExpensesOverAssets 1.74% [1],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 177
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 569
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 986
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,150
[1] Expenses information in the table has been restated to reflect estimated fees and expenses for the upcoming fiscal year.
[2] AFFE is based on estimated amounts for the upcoming fiscal year.
[3] Effective October 1, 2014, SIMC, the Fund's investment adviser, has contractually agreed to waive its management fee as necessary to keep the management fee paid by the Fund during its fiscal year from exceeding 0.95%. This fee waiver agreement shall remain in effect until January 31, 2016 and, unless earlier terminated, shall be automatically renewed for successive one-year periods thereafter. The agreement may be amended or terminated only with the consent of the Board of Trustees.