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SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk/Return [Heading] oef_RiskReturnHeading MID-CAP FUND
Objective [Heading] oef_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock

Long-term capital appreciation.
Expense Heading [Optional Text] oef_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] oef_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.
Operating Expenses Caption [Optional Text] oef_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] oef_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] oef_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 or hold 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] oef_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] oef_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] oef_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 62% of the average value of its portfolio.
Portfolio Turnover, Rate oef_PortfolioTurnoverRate 62.00%
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock

Under normal circumstances, the Mid-Cap Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of medium-sized companies. For purposes of this Fund, a medium-sized company is a company with a market capitalization in the range of companies in the Russell Midcap Index (between approximately $1.0 billion and $101.6 billion as of December 31, 2025) at the time of purchase. The market capitalization range and the composition of the Russell Midcap Index are

subject to change. The Fund's investments in equity securities may include common and preferred stocks, warrants and, to a lesser extent, securities of small capitalization companies, real estate investment trusts (REITs), exchange-traded funds (ETFs) and securities of large capitalization companies.

The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage Fund assets under the general supervision of SEI Investments Management Corporation, the Fund's adviser (SIMC or the Adviser). In managing the Fund's assets, the Sub-Advisers select stocks of companies that have low price-earnings and price-book ratios, but that also have high sustainable growth levels and the probability of high positive earnings revisions.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] oef_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 ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, 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] oef_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 ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance.
Performance Availability Phone [Text] oef_PerformanceAvailabilityPhone 1-800-DIAL-SEI
Performance Past Does Not Indicate Future [Text] oef_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] oef_BarChartClosingTextBlock

Best Quarter: 24.27% (06/30/2020)
Worst Quarter: -30.53% (03/31/2020)
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 24.27%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (30.53%)
Performance Table Heading oef_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2025)
Index No Deduction for Fees, Expenses, or Taxes [Text] oef_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate oef_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 oef_PerformanceTableNotRelevantToTaxDeferred 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 oef_PerformanceTableExplanationAfterTaxHigher In some cases, the Fund's return after taxes may exceed the Fund's return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.
Performance Table Narrative oef_PerformanceTableNarrativeTextBlock

This table compares the Fund's average annual total returns to those of a broad-based securities market index and an additional index with characteristics relevant to the Fund's investment strategy.

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 some cases, the Fund's return after taxes may exceed the Fund's return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Risk Not Insured [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock 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.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Risk Lose Money [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock You could lose money on your investment in the Fund, just as you could with other investments.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Market Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

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 equity or bond market as a whole. Equity markets may decline significantly in response to adverse issuer, political, regulatory, market, economic or other developments that may cause broad changes in market value, public perceptions concerning these developments, and adverse investor sentiment or publicity. Similarly, environmental and public health risks, such as natural disasters, epidemics, pandemics or widespread fear that such events may occur, may impact markets adversely and cause market volatility in both the short- and long-term.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Small and Medium Capitalization Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Small and Medium Capitalization Risk — The risk that small and medium capitalization companies in which the Fund may invest may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small and medium capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization and medium capitalization stocks may be more volatile than those of larger companies. Small capitalization and medium capitalization stocks may be traded over-the-counter (OTC). OTC stocks may trade less frequently and in smaller volume than exchange-listed stocks and may have more price volatility than that of exchange-listed stocks.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Investment Style Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Investment Style Risk — The risk that securities of medium capitalization companies may underperform other segments of the equity markets or the equity markets as a whole.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Warrants Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Warrants Risk — Warrants are instruments that entitle the holder to buy an equity security at a specific price for a specific period of time. Warrants may be more speculative than other types of investments. The price of a warrant may be more volatile than the price of its underlying security, and a warrant may offer greater potential for capital appreciation as well as capital loss. A warrant ceases to have value if it is not exercised prior to its expiration date.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Real Estate Investment Trusts Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Real Estate Investment Trusts Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Exchange-Traded Funds Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Exchange-Traded Funds Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. When the Fund invests in an ETF, in addition to

directly bearing the expenses associated with its own operations, it will bear a pro rata portion of the ETF's expenses.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Large Capitalization Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Large Capitalization Risk — The risk that larger, more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes. Larger companies also may not be able to attain the high growth rates of successful smaller companies.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Liquidity Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

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 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.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | Preferred Stock Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Preferred Stock Risk — Preferred stock represents an equity or ownership interest in an issuer that pays dividends at a specified rate and that has precedence over common stock in the payment of dividends. In the event an issuer is liquidated or declares bankruptcy, the claims of owners of bonds take precedence over the claims of those who own preferred and common stock.
SIMT MID CAP FUND | MID-CAP FUND - Class I Prospectus | CLASS I  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.40%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.84%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.24%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 126
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 393
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 681
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,500
MID-CAP FUND - Class I Prospectus | Russell Midcap Index Return (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Russell Midcap Index Return (reflects no deduction for fees, expenses or taxes)
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.60% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.67% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.01% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.91% [1]
MID-CAP FUND - Class I Prospectus | S&P 500 Index Return (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel S&P 500 Index Return (reflects no deduction for fees, expenses or taxes)
Average Annual Return, Percent oef_AvgAnnlRtrPct 17.88% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.42% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.82% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.84% [1]
MID-CAP FUND - Class I Prospectus | CLASS I  
Prospectus [Line Items] oef_ProspectusLineItems  
Annual Return [Percent] oef_AnnlRtrPct 15.34%
Annual Return [Percent] oef_AnnlRtrPct 20.08%
Annual Return [Percent] oef_AnnlRtrPct (12.09%)
Annual Return [Percent] oef_AnnlRtrPct 24.28%
Annual Return [Percent] oef_AnnlRtrPct 5.45%
Annual Return [Percent] oef_AnnlRtrPct 27.60%
Annual Return [Percent] oef_AnnlRtrPct (14.69%)
Annual Return [Percent] oef_AnnlRtrPct 14.53%
Annual Return [Percent] oef_AnnlRtrPct 15.63%
Annual Return [Percent] oef_AnnlRtrPct 9.78%
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return Before Taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.78% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.62% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.71% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.57% [1]
Performance Inception Date oef_PerfInceptionDate Feb. 16, 1993 [1]
MID-CAP FUND - Class I Prospectus | CLASS I | After Taxes on Distributions  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.01% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.03% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.68% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.80% [1]
MID-CAP FUND - Class I Prospectus | CLASS I | After Taxes on Distributions and Sales  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.12% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.14% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.39% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.61% [1]
[1] The Fund's Class I Shares commenced operations on October 1, 2007. Therefore, the Fund's average annual total returns for the periods prior to that time are based on the average annual total returns of the Class F Shares, adjusted for the higher expenses of the Class I Shares.