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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SIMT Prime Obligation Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Preserving principal value and maintaining a high degree of liquidity while providing current income.

Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

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

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 2014-01-31
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses are based on estimated amounts for the current 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:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Prime Obligation Fund is composed of short-term debt obligations of U.S. issuers that are rated in one of the two highest rating categories by a Nationally Recognized Statistical Rating Organization or that the Fund’s sub-adviser (the Sub-Adviser) determines are of comparable quality. Under normal market conditions, the Fund invests in: (i) commercial paper and other short-term corporate obligations (including asset-backed securities) rated in the highest short-term rating category or that the Sub-Adviser determines are of comparable quality; (ii) certificates of deposit, time deposits, bankers’ acceptances, bank notes and other obligations of U.S. commercial banks or savings and loan institutions that meet certain asset requirements; (iii) short-term obligations issued by state and local governments; and (iv) U.S. Treasury obligations and obligations issued or guaranteed as to principal and interest by agencies or instrumentalities of the U.S. Government. The Fund may also enter into fully-collateralized repurchase agreements.


Using a top-down strategy and bottom-up security selection, the Sub-Adviser seeks securities with an acceptable maturity (a dollar-weighted average portfolio maturity of no more than 60 days and a remaining maturity of no greater than 397 days, consistent with requirements of the Investment Company Act of 1940, as amended, (the 1940 Act) for money market funds) that are marketable and liquid, offer competitive yields and are issued by issuers that are on a sound financial footing. The Sub-Adviser also considers factors such as the anticipated level of interest rates and the maturity of individual securities relative to the maturity of the Fund as a whole. The Fund follows the strict 1940 Act rules about the credit quality, maturity and diversification of its investments. With respect to credit quality and maturity, the Fund’s investment guidelines may be more restrictive than the 1940 Act rules applicable to money market funds.

Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

An investment in the Fund is not a bank deposit nor is it insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. Although the Fund seeks to maintain a constant price per share of $1.00, you may lose money by investing in the Fund.


Interest Rate Risk — The risk that the Fund’s yield will decline due to falling interest rates. A rise in interest rates typically causes the value of fixed income securities in which the Fund invests to fall in, while a fall in interest rates typically causes the value of such securities to rise. During periods when interest rates are low, the Fund’s yield (and total return) also will be low and the income generated by the Fund may not be sufficient to offset all or a significant portion of the Fund’s expenses, which could impair the Fund’s ability to provide a positive yield and maintain a stable $1.00 share price.


The Fund is also subject to the following additional risks:


Asset-Backed Securities Risk — Payment of principal and interest on asset-backed securities is dependent largely on the cash flows generated by the assets backing the securities, and asset-backed securities may not have the benefit of any security interest in the related assets.


Credit Risk — The risk that the issuer of a security or the counterparty to a contract will default or otherwise become unable to honor a financial obligation.


Extension Risk — The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security’s value.


Foreign Issuer Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments.


Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance.


Market Risk — The risk that the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the bond market as a whole.


Opportunity Risk — The risk of missing out on an investment opportunity because the assets necessary to take advantage of that opportunity are tied up in other investments.


Prepayment Risk — The risk that, with declining interest rates, fixed income securities with stated interests may have the principal paid earlier than expected, requiring the Fund to invest the proceeds at generally lower interest rates.


Redemption Risk - The Fund may experience periods of heavy redemptions that could cause the Fund to liquidate its assets at inopportune times or at a loss or depressed value, particularly during periods of declining or illiquid markets. Redemptions by a few large investors in the Fund may have a significant adverse effect on the Fund’s ability to maintain a stable $1.00 share price. In the event any money market fund fails to maintain a stable net asset value, other money market funds, including the Fund, could face a market-wide risk of increased redemption pressures, potentially jeopardizing the stability of their $1.00 share prices.


U.S. Government Securities Risk — Although U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Obligations issued by some U.S. Government agencies are backed by the U.S. Treasury, while others are backed solely by the ability of the agency to borrow from the U.S. Treasury or by the agency’s own resources.

Risk Money Market Fund [Text] rr_RiskMoneyMarketFund An investment in the Fund is not a bank deposit nor is it insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. Although the Fund seeks to maintain a constant price per share of $1.00, you may lose money by investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

As of January 31, 2013, the Fund had not commenced operations and did not have a performance history.

Performance One Year or Less [Text] rr_PerformanceOneYearOrLess As of January 31, 2013, the Fund had not commenced operations and did not have a performance history.
Class A
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.06%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.71% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.77%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.33%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.44% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 45
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 213
[1] Other expenses are based on estimated amounts for the current fiscal year.
[2] SEI Investments Global Funds Services has contractually agreed to waive fees and to reimburse expenses in order to keep total operating expenses, exclusive of interest from borrowings, brokerage, commissions, taxes, trustee fees and extraordinary expenses not incurred in the ordinary course of the Fund's business and net of the Fund's distributor's fee waivers, from exceeding 0.44%. This fee waiver and reimbursement agreement shall remain in effect until January 31, 2014 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.