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Class F Prospectus | SIMT Long/Short Alternative Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SIMT Long/Short Alternative Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Long-term capital appreciation.
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.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 4.00%
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

Under normal circumstances, the Fund will seek to generate capital appreciation over time by taking long and short positions with respect to investments that provide broad exposure to U.S. and non-U.S. equity markets, and, to a lesser extent U.S. fixed income markets. The Fund will seek exposure to the equity and fixed income markets through investments in index futures and exchange traded funds (ETFs).


The Fund will take long and short positions in an attempt to emulate the return of a model portfolio or composite of hedge funds (the Composite) constructed by SEI Investments Management Corporation (SIMC). The Composite will primarily consist of hedge funds that implement a long/short equity investment strategy, but may include, from time to time, hedge funds that implement other equity-focused investment strategies. In general, a hedge fund that implements a long/short equity investment strategy takes (i) long positions with respect to investments that are projected to be undervalued and likely to increase in price, and (ii) short positions with respect to investments that are projected to be overvalued and likely to decrease in price. A hedge fund implementing such a strategy will often base its investment decisions on a variety of economic factors, including credit and currency indicators.


A hedge fund typically takes long and short positions with respect to individual issuers, but the Fund will not seek to emulate the portion of the return associated with such individual security selection. Rather, the Fund will invest based on the theory that the returns of the individual hedge funds comprising the Composite are driven to a significant extent by dynamic exposure to the broader equity markets, as well as, to a lesser degree, exposure to credit, interest rate and currency markets (each market a Factor, and collectively, Factors). Given the foregoing, and for other reasons, the Fund's performance may materially vary from the Composite, especially over shorter time periods.


Under the general supervision of SIMC, the Fund's sub-adviser (the Sub-Adviser) will select the Fund's investments pursuant to the following investment process. First, the Sub-Adviser will seek to deconstruct and isolate the Factors, as well their relative weightings, that materially contribute to the Composite's aggregate return. The Sub-Adviser will do so using a quantitative analysis of the historical return information of the hedge funds comprising the Composite, based on information made available through third party databases and other resources. The Sub-Adviser will then select, and will take long and short positions in, investments that it believes will provide similar performance to the weighted Factors of the Composite's aggregate return. Due to its investment strategy, the Fund may buy and sell securities and other instruments frequently.


The Sub-Adviser will analyze and rebalance the Fund's portfolio at least monthly. The Fund may also trade more frequently, including daily, due to cash flows and extreme market fluctuations, as well as changes in the Composite. Assets of the Fund not allocated to the Sub-Adviser are directly managed by SIMC.


In the aggregate, the Fund expects to have net long exposure to both the equity and fixed income markets, which the Fund may adjust over time as a result of market conditions. Exposure to fixed income and currency markets may reduce volatility within the portfolio and serve to hedge equity exposure. The Fund may invest in futures, ETFs and swaps that provide exposure to the returns of equity markets comprised of: common stocks, preferred stocks, depositary receipts, rights and warrants. These equity securities may be of U.S. and non-U.S. issuers, including emerging market issuers, of various market capitalizations and industries.


The Fund may also invest in futures, ETFs and swaps that provide exposure to the returns of U.S. fixed income markets composed of: U.S. Treasury obligations, obligations issued by agencies or instrumentalities of the U.S. Government, including obligations not guaranteed by the U.S. Treasury (such as obligations issued by U.S. Government-sponsored entities), corporate bonds and debentures, commercial paper, money market instruments, money market funds, obligations of supranational entities issued or guaranteed by certain banks and zero coupon obligations and obligations of entities organized to restructure the outstanding debt of such issuers. These fixed-income securities may be investment and non-investment grade (also known as "high yield" securities or "junk bonds") and of any duration or maturity. The Fund may also invest in currency futures.


In addition, the Fund may also invest in cash equivalents, including to serve as collateral for derivative positions or as a result of a decrease in market exposure. Cash equivalents include, but are not limited to, U.S. Treasury obligations, commercial paper, money market instruments and money market funds.


The Fund will not make any direct investments in hedge funds.


SIMC generally expects that investment decisions will be based on the Sub-Adviser's analysis of the Composite, but SIMC or the Sub-Adviser may make investment decisions independent of such analysis. For instance, SIMC or the Sub-Adviser may reduce market exposure under certain unusual or adverse market conditions, including as a defensive strategy during times of increased market volatility.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

The success of the strategy depends on both SIMC's construction of the Composite and the Sub-Adviser's ability to select investments that will emulate the aggregate performance of the Composite. The methodology by which SIMC selects and weights hedge funds for the Composite may not achieve the desired results and may cause the Fund to lose money or underperform other comparable mutual funds. Similarly, the methodology by which the Sub-Adviser selects investments may not achieve the desired results and the performance of the Fund's portfolio may materially deviate from, and substantially underperform, the aggregate returns of the Composite.


The Fund is intended to be only one component of an investor's broader investment program and is not designed to be a complete investment program. Investors who seek to add an alternative component to their overall investment program may wish to allocate a portion of their investment to the Fund. The Fund may invest, directly or indirectly, in a broad range of asset classes, securities and other investments to achieve its investment strategy. The principal risks of the investment strategy, as well as those associated with making investments in such asset classes, securities and other investments are set forth below.


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


Fixed Income Market Risk — The prices of the Fund's fixed income securities respond to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments and their agencies. Generally, the Fund's fixed income securities will decrease in value if interest rates rise and vice versa. In a low interest rate environment, risks associated with rising rates are heightened. Declines in dealer market-making capacity as a result of structural or regulatory changes could decrease liquidity and/or increase volatility in the fixed income markets. In the case of foreign securities, price fluctuations will reflect international economic and political events, as well as changes in currency valuations relative to the U.S. dollar. In response to these events, the Fund's value may fluctuate and/or the Fund may experience increased redemptions from shareholders, which may impact the Fund's liquidity or force the Fund to sell securities into a declining or illiquid market.


Investment Style Risk — Investment style risk is the risk that the Fund's investment in certain securities in a particular market segment pursuant to its particular investment strategy may underperform other market segments or the market as a whole.


Derivatives Risk — The Fund is expected to implement the majority of its investment strategies through the use of derivative instruments, including futures contracts (primarily futures on equity or fixed income indexes) and swaps (primarily swaps on equity or fixed income indexes). The Fund's use of futures contracts and swaps is subject to market risk, leverage risk, correlation risk and liquidity risk. Credit risk, leverage risk and liquidity risk are described below. Many over-the-counter (OTC) derivative instruments will not have liquidity beyond the counterparty to the instrument. Market risk is the risk that the market value of an investment may move up and down, sometimes rapidly and unpredictably. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. The Fund's use of swap agreements is also subject to credit risk and valuation risk. Valuation risk is the risk that the derivative may be difficult to value and/or valued incorrectly. Each of these risks could cause the Fund to lose more than the principal amount invested in a derivative instrument. Some derivatives have the potential for unlimited loss, regardless of the size of the Fund's initial investment. The other parties to certain derivative contracts present the same types of credit risk as issuers of fixed income securities. The Fund's use of derivatives may also increase the amount of taxes payable by shareholders. Both U.S. and non-U.S. regulators are in the process of adopting and implementing regulations governing derivatives markets, the ultimate impact of which remains unclear.


Short Sales Risk — A short sale involves the sale of a security that the Fund does not own in the expectation of purchasing the same security (or a security exchangeable therefore) at a later date at a lower price. Short sales expose the Fund to the risk that it will be required to buy the security sold short (also known as "covering" the short position) at a time when the security has appreciated in value, thus resulting in a loss to the Fund that is potentially unlimited. Investment in short sales may also cause the Fund to incur expenses related to borrowing securities. In addition, shorting a future contract may require posting only a margin that may amount to less than notional exposure of the contract. Such a practice may exacerbate the loss in a case of adverse price action.


Investment Company and Exchange-Traded Funds (ETFs) Risk — When the Fund invests in an investment company, including ETFs, in addition to directly bearing the expenses associated with its own operations, it will bear a pro rata portion of the investment company's expenses. Further, while the risks of owning shares of an investment company generally reflect the risks of owning the underlying investments of the investment company, the Fund may be subject to additional or different risks than if the Fund had invested directly in the underlying investments. For example, the lack of liquidity in an ETF could result in its value being more volatile than that of the underlying portfolio securities.


Below Investment Grade Securities (Junk Bonds) Risk — Fixed income securities rated below investment grade (junk bonds) involve greater risks of default or downgrade and are generally more volatile than investment grade securities because the prospect for repayment of principal and interest of many of these securities is speculative. Because these securities typically offer a higher rate of return to compensate investors for these risks, they are sometimes referred to as "high yield bonds," but there is no guarantee that an investment in these securities will result in a high rate of return. These risks may be increased in foreign and emerging markets.


Corporate Fixed Income Securities Risk — Corporate fixed income securities respond to economic developments, especially changes in interest rates, as well as to perceptions of the creditworthiness and business prospects of individual issuers.


Commercial Paper Risk — Commercial paper is a short-term obligation with a maturity generally ranging from one to 270 days and is issued by U.S. or foreign companies or other entities in order to finance their current operations. Such investments are unsecured and usually discounted from their value at maturity. The value of commercial paper may be affected by changes in the credit rating or financial condition of the issuing entities and will tend to fall when interest rates rise and rise when interest rates fall. Asset-backed commercial paper may be issued by structured investment vehicles or other conduits that are organized to issue the commercial paper and to purchase trade receivables or other financial assets. The repayment of asset-backed commercial paper depends primarily on the cash collections received from such issuer's underlying asset portfolio and the issuer's ability to issue new asset-backed commercial paper.


Depositary Receipts Risk — Depositary receipts, such as American Depositary Receipts (ADRs), are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments.


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.


Foreign Investment/Emerging Markets 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. These additional risks may be heightened with respect to emerging market countries because political turmoil and rapid changes in economic conditions are more likely to occur in these countries.


Currency Risk — Due to its active positions in currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected. Currency exchange rates may fluctuate in response to, among other things, changes in interest rates, intervention (or failure to intervene) by U.S. or foreign governments, central banks or supranational entities, or by the imposition of currency controls or other political developments in U.S. or abroad.


Interest Rate Risk — The risk that a rise in interest rates will cause a fall in the value of fixed income securities, including U.S. Government securities, in which the Fund invests. 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. A low interest rate environment may present greater interest rate risk because there may be a greater likelihood of rates increasing and rates may increase more rapidly.


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.


Duration Risk — The longer-term securities in which the Fund may invest tend to be more volatile than shorter-term securities. A portfolio with a longer average portfolio duration is more sensitive to changes in interest rates than a portfolio with a shorter average portfolio duration.


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


Leverage Risk — The Fund's use of derivatives may result in the Fund's total investment exposure substantially exceeding the value of its portfolio securities and the Fund's investment returns depending substantially on the performance of securities that the Fund may not directly own. The use of leverage can amplify the effects of market volatility on the Fund's share price and may also cause the Fund to liquidate portfolio positions when it would not be advantageous to do so in order to satisfy its obligations. The Fund's use of leverage may result in a heightened risk of investment loss.


Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities, which may affect the Fund's performance.


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


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


Investing in the Fund involves risk, and there is no guarantee that the Fund will achieve its investment goal. You could lose money on your investment in the Fund, just as you could with other investments. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on your investment in the Fund, just as you could with other investments.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past four calendar years and by showing how the Fund's average annual returns for 1 year and since the Fund's inception compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past four calendar years and by showing how the Fund's average annual returns for 1 year and since the Fund's inception compare with those of a broad measure of market performance.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex This table compares the Fund's average annual total returns to those of a broad-based index and the BofA Merrill Lynch 3-Month U.S. Treasury Bill Index, which is a secondary index. This index is an unmanaged market index of short-term U.S. Government securities with a remaining term to final maturity of less than three months.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-DIAL-SEI
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter: 4.40% (03/31/17)
Worst Quarter: -7.31% (12/31/18)
  
  
  
  
  
  
  
  
  
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2017
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.40%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.31%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2018)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In the event of negative performance, the Fund's returns after taxes on distributions and sale of Fund shares are calculated assuming that an investor has sufficient capital gains of the same character from other investments to offset any capital losses from the sale of Fund shares. As a result, the Fund's returns after taxes on distributions and sale of Fund shares may exceed the Fund's returns before taxes and/or returns after taxes on distributions.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

This table compares the Fund's average annual total returns to those of a broad-based index and the BofA Merrill Lynch 3-Month U.S. Treasury Bill Index, which is a secondary index. This index is an unmanaged market index of short-term U.S. Government securities with a remaining term to final maturity of less than three months.


After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In the event of negative performance, the Fund's returns after taxes on distributions and sale of Fund shares are calculated assuming that an investor has sufficient capital gains of the same character from other investments to offset any capital losses from the sale of Fund shares. As a result, the Fund's returns after taxes on distributions and sale of Fund shares may exceed the Fund's returns before taxes and/or returns after taxes on distributions.
Class F Prospectus | SIMT Long/Short Alternative Fund | HFRX Equity Hedge Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel HFRX Equity Hedge Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (9.42%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (0.55%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 19, 2014
Class F Prospectus | SIMT Long/Short Alternative Fund | BofA Merrill Lynch 3-Month U.S. Treasury Bill Index Return (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel BofA Merrill Lynch 3-Month U.S. Treasury Bill Index Return (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.87%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.77%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 19, 2014
Class F Prospectus | SIMT Long/Short Alternative Fund | Class F  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.64%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 147
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 456
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 787
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,724
Annual Return 2015 rr_AnnualReturn2015 (0.50%)
Annual Return 2016 rr_AnnualReturn2016 0.60%
Annual Return 2017 rr_AnnualReturn2017 10.73%
Annual Return 2018 rr_AnnualReturn2018 (5.00%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (5.00%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.24%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 19, 2014
Class F Prospectus | SIMT Long/Short Alternative Fund | Class F | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (6.04%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.22%
Class F Prospectus | SIMT Long/Short Alternative Fund | Class F | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (2.84%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.66%