v3.25.4
Label Element Value
SIMT REAL ESTATE FUND | REAL ESTATE FUND - Class Y Prospectus  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk/Return [Heading] oef_RiskReturnHeading REAL ESTATE FUND
Objective [Heading] oef_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock

Total return, including current income and 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 72% of the average value of its portfolio.
Portfolio Turnover, Rate oef_PortfolioTurnoverRate 72.00%
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock

Under normal circumstances, the Real Estate Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of real estate companies (e.g., common stocks, rights, warrants, exchange-traded funds (ETFs), convertible securities and preferred stocks of real estate investment trusts (REITs) and real estate operating companies (REOCs)). Generally, the Fund will invest in real estate companies operating in the United States.

The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) to manage Fund assets under the general supervision of SEI Investments Management Corporation, the Fund's adviser (SIMC or the Adviser).
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 Class Y Shares of 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 Class Y Shares of 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: 16.93% (12/31/2023)
Worst Quarter: -22.71% (03/31/2020)
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 16.93%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (22.71%)
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 REAL ESTATE FUND | REAL ESTATE FUND - Class Y 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 REAL ESTATE FUND | REAL ESTATE FUND - Class Y 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 REAL ESTATE FUND | REAL ESTATE FUND - Class Y 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 REAL ESTATE FUND | REAL ESTATE FUND - Class Y Prospectus | Real Estate Industry Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Real Estate Industry Risk — Securities of companies principally engaged in the real estate industry may 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. The Fund's investments are concentrated in issuers conducting business in the real estate industry, and therefore the Fund is subject to risks associated with legislative or regulatory changes, adverse market conditions and/or increased competition affecting that industry.
SIMT REAL ESTATE FUND | REAL ESTATE FUND - Class Y 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, which are discussed above. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties.
SIMT REAL ESTATE FUND | REAL ESTATE FUND - Class Y Prospectus | Investment Style Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Investment Style Risk — The risk that the securities of issuers in the real estate industry may underperform other segments of the equity markets or the equity markets as a whole.
SIMT REAL ESTATE FUND | REAL ESTATE FUND - Class Y Prospectus | Convertible and Preferred Securities Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Convertible and Preferred Securities Risk — Convertible and preferred securities have many of the same characteristics as stocks, including many of the same risks. In addition, convertible securities may be more sensitive to changes in interest rates than stocks. Convertible securities may also have credit ratings below investment grade, meaning that they carry a higher risk of failure by the issuer to pay principal and/or interest when due.
SIMT REAL ESTATE FUND | REAL ESTATE FUND - Class Y 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 REAL ESTATE FUND | REAL ESTATE FUND - Class Y Prospectus | Warrants and Rights Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Warrants and Rights Risk — Warrants and rights may lack a liquid secondary market for resale. The prices of warrants and rights may fluctuate as a result of speculation or other factors. Warrants and rights can provide a greater potential for profit or loss than an equivalent investment in the underlying security. Prices of warrants and rights do not necessarily move in tandem with the prices of their underlying securities and are highly volatile and speculative investments. If a warrant or right expires without being exercised, the Fund will lose any amount paid for the warrant or right.
SIMT REAL ESTATE FUND | REAL ESTATE FUND - Class Y 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 REITs and other 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 REAL ESTATE FUND | REAL ESTATE FUND - Class Y 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 REAL ESTATE FUND | REAL ESTATE FUND - Class Y Prospectus | Class Y  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.34%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.99%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 101
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 315
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 547
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,213
REAL ESTATE FUND - Class Y 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 10.89% [1]
REAL ESTATE FUND - Class Y Prospectus | Wilshire U.S. Real Estate Securities Index Return (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] oef_ProspectusLineItems  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Wilshire U.S. Real Estate Securities Index Return (reflects no deduction for fees, expenses or taxes)
Average Annual Return, Percent oef_AvgAnnlRtrPct 3.47% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.04% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.74% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.10% [1]
REAL ESTATE FUND - Class Y Prospectus | Class Y  
Prospectus [Line Items] oef_ProspectusLineItems  
Annual Return [Percent] oef_AnnlRtrPct 6.93%
Annual Return [Percent] oef_AnnlRtrPct 5.48%
Annual Return [Percent] oef_AnnlRtrPct (5.75%)
Annual Return [Percent] oef_AnnlRtrPct 25.59%
Annual Return [Percent] oef_AnnlRtrPct (3.29%)
Annual Return [Percent] oef_AnnlRtrPct 44.25%
Annual Return [Percent] oef_AnnlRtrPct (25.62%)
Annual Return [Percent] oef_AnnlRtrPct 16.09%
Annual Return [Percent] oef_AnnlRtrPct 10.93%
Annual Return [Percent] oef_AnnlRtrPct 2.06%
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return Before Taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.06% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.12% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.18% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.02% [1]
Performance Inception Date oef_PerfInceptionDate Nov. 13, 2003 [1]
REAL ESTATE FUND - Class Y Prospectus | Class Y | 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 (1.03%) [1],[2]
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.99% [1],[2]
Average Annual Return, Percent oef_AvgAnnlRtrPct 3.58% [1],[2]
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.14% [1],[2]
REAL ESTATE FUND - Class Y Prospectus | Class Y | 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 2.69% [1],[2]
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.96% [1],[2]
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.04% [1],[2]
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.04% [1],[2]
[1] The Fund's Class Y Shares commenced operations on December 31, 2014. For periods prior to December 31, 2014, the performance of the Fund's Class F Shares has been used. Returns for Class Y Shares would have been substantially similar to those of Class F Shares and would have differed only to the extent that Class Y Shares have lower total annual fund operating expenses than Class F Shares.
[2] After tax figures are based on estimated amounts for the periods ended December 31, 2025.