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Class F Prospectus | SIMT Liquid Alternative Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading LIQUID 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, 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 [Text] rr_OperatingExpensesCaption 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. Because the Fund is new, no portfolio turnover information has been provided.
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 hold or 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 take long and short positions in investments that provide broad exposure to the global equity, fixed income and currency markets. The Fund will invest primarily in exchange-traded derivative instruments, including futures, options, and swaps, but to a lesser extent may invest in

derivative instruments that are traded over-the-counter, such as forwards. The Fund primarily will hold cash and/or invest in money market instruments to collateralize its derivative positions. Additionally, the Fund will invest from time-to-time in shares of exchange-traded funds (ETFs), such as U.S. or non-U.S. corporate bond ETFs.

The Fund seeks to replicate the total return (before taking into account the Fund's fees and expenses) of a model portfolio of alternative investment strategies, which primarily consists of hedge funds (the "Composite") calculated by the investment sub-adviser (the "Sub-Adviser"), at the direction of SEI Investments Management Corporation ("SIMC" or the "Adviser").

The Composite consists of two components (each a "sleeve"): a multi-strategy sleeve and a managed futures sleeve.

Multi-Strategy Sleeve. The multi-strategy sleeve of the Composite will seek to replicate the average total return of the 50 largest hedge funds (excluding managed futures funds), equally weighted. The list of hedge funds is determined by the monthly reporting of assets under management to the Eurekahedge database, which is reconstituted annually. This sleeve will include exposure to a cross-section of alternative investment strategies, including, but not limited to, equity long/short, global macro, event driven, and relative value strategies. SIMC, in connection with its management of the overall strategy to replicate the total return of the Composite and thus the return of the overall hedge fund market, may instruct the Sub-Adviser at any time to discontinue the use of any of these strategies or add one or more new strategies.

Managed Futures Sleeve. The managed futures sleeve of the Composite is designed to reflect the total return of the Societe Generale (SG) CTA Trend Index, which consists of 20 equally weighted large managed futures funds and is reconstituted annually.

The Sub-Adviser generally expects to maintain an approximate 60/40 weighting between the multi-strategy sleeve and the managed futures sleeve, respectively, within the Composite, but the Adviser and/or Sub-Adviser may increase or decrease a sleeve's weighting within the Composite.

The Fund seeks to achieve returns similar to the total return of the Composite through a dynamic allocation of long and short investments among the global equity, fixed income and currency markets. The Sub-Adviser will use a quantitative model to estimate the market exposures that drive the aggregate returns of the Composite and will primarily invest in derivative instruments that it estimates will provide, in the aggregate, market exposure similar to that of the Composite. The Sub-Adviser may use various approaches to estimate market exposure, including an analysis of historical return information for the hedge funds within the Composite.

The Fund's investments will include futures, forwards, options, ETFs and securities index swaps that provide exposure to the returns of (i) the equity markets, including common stocks, preferred stocks, warrants, rights, depositary receipts, and real estate investment trusts (REITs), which may be from U.S. and non-U.S. issuers (including emerging market issuers) of various capitalizations and industries; (ii) the currency markets, through U.S. and non-U.S. issuers (including emerging markets issuers) or through exposure to currency futures; and (iii) the fixed income markets, through U.S. and non-U.S. issuers (including emerging markets issuers) through exposure to corporate and government fixed income securities, asset-backed securities, mortgage-backed securities (including commercial mortgage-backed securities and "to-be-announced" transactions), corporate bonds and debentures, commercial paper, money market instruments, money market funds, mortgage dollar rolls, obligations of supranational entities, zero coupon obligations and

obligations to restructure outstanding debt of such issuers, which may be investment grade and non-investment grade debt (junk bonds), of any duration or maturity.

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

The amount of the Fund's assets that may be allocated to various strategies and among investments is expected to vary over time and may be adjusted over short periods of time.

There are no limitations on the minimum or maximum amount of the Fund's assets that may be allocated to investments representing exposure to any one of the global equity, fixed income and currency markets.

Due to its investment strategy, the Fund may buy and sell securities and other instruments frequently. The Sub-Adviser may also consider other factors when allocating the Fund's assets, such as: (i) the Fund's obligations under its various derivative positions; (ii) portfolio rebalancing; (iii) redemption requests; (iv) yield management; (v) credit management; and (vi) volatility management.

The Fund uses a multi-manager approach, relying primarily on one or more Sub-Advisers under the general supervision of SIMC, the Fund's adviser.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The Fund is new, and therefore has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund's return based on net assets and comparing the Fund's performance to a broad measure of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund's return based on net assets and comparing the Fund's performance to a broad measure of market performance.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Fund is new, and therefore has no performance history.
Class F Prospectus | SIMT Liquid Alternative Fund | Risk Money Market Fund Sponsor May Not Provide Support [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Government will provide financial support to its agencies and instrumentalities if it is not obligated by law to do so.
Class F Prospectus | SIMT Liquid Alternative Fund | Risk Not Insured [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_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.
Class F Prospectus | SIMT Liquid Alternative Fund | Risk Money Market Fund May Not Preserve Dollar [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Certain money market funds float their NAV while others seek to preserve the value of investments at a stable NAV (typically, $1.00 per share).
Class F Prospectus | SIMT Liquid Alternative Fund | Risk Money Market Fund May Impose Fees or Suspend Sales [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock If the liquidity of a money market fund's portfolio deteriorates below certain levels, the money market fund may suspend redemptions (i.e., impose a redemption gate) and thereby prevent the Fund from selling its investment in the money market fund or impose a fee of up to 2% on amounts the Fund redeems from the money market fund (i.e., impose a liquidity fee).
Class F Prospectus | SIMT Liquid Alternative Fund | Derivatives Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Derivatives Risk — The Fund's use of futures contracts, forward contracts, options and swaps is subject to market risk, leverage risk, correlation risk and liquidity risk. Market risk is the risk that the market value of an investment may move up and down, sometimes rapidly and unpredictably. 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. 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 forward contracts and swap agreements is also subject to credit risk and valuation risk. Credit risk is described below. 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 have adopted and implemented regulations governing derivatives markets, the ultimate impact of which remains unclear.
Class F Prospectus | SIMT Liquid Alternative Fund | Long/Short Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Long/Short Risk — The Fund seeks long exposure to certain financial instruments and short exposure to certain other financial instruments. There is no guarantee that the returns on the Fund's long or short positions will produce positive returns and the Fund could lose money if either or both the Fund's long and short positions produce negative returns.
Class F Prospectus | SIMT Liquid Alternative Fund | Asset Allocation Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Asset Allocation Risk — Through the Fund's investments in derivatives it is indirectly subject to asset allocation risk, which is the risk that the allocation of the Fund's assets among various asset classes will cause the Fund to underperform other funds with a similar investment objective and/or underperform the markets in which the Fund invests.
Class F Prospectus | SIMT Liquid Alternative Fund | Currency Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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. Due to the Fund's investments in securities, including debt securities, denominated in foreign currencies, as well as the Fund's investments in currency futures contracts, it will be subject to the risk that 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 the United States or abroad. Although the Sub-Adviser may use currency futures contracts in an attempt to mitigate currency risk, there is no guarantee that such positions will be successful in reducing the risk in the portfolio.
Class F Prospectus | SIMT Liquid Alternative Fund | Equity Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Equity Market Risk — The Fund may be exposed to equity market risk through the Fund's investments in derivatives. Equity market risk is the risk that the market value of an equity 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Fixed Income Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Fixed Income Market Risk — The Fund may be exposed to fixed income market risk through the Fund's investments in derivatives or through the Fund's investments in ETFs. The prices of the 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, 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. Markets for fixed income securities 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. 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 (or an underlying ETF) to sell investments into a declining or illiquid market.
Class F Prospectus | SIMT Liquid Alternative Fund | Information Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Information Risk — The Sub-Adviser relies on information published by third parties when constructing and maintaining the Composite, including information about private funds. Because private funds are only required to make limited information about their operations and investments publicly available, the information used by the Sub-Adviser may be incomplete, inaccurate or out of date and the Sub-Adviser will be limited it its ability to verify the accuracy of such information. In addition, because any errors in the underlying data sources may not be readily discoverable, the Sub-Adviser could make investment decisions based on inaccurate information, which could influence the Fund's investments, alter the Fund's risk profile and change the Fund's performance. Data sources used by the Sub-Adviser (or underlying data sources used by third parties on which the Sub-Adviser relies) could change the frequency with which they make data available or change the universe of data that is available, both of which could affect the Sub-Adviser's ability to construct and maintain the Composite. Changes in regulation could result in such data providers deciding to cease or substantially change their business, which could similarly affect the Sub-Adviser.
Class F Prospectus | SIMT Liquid Alternative Fund | Exchange-Traded Funds Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_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.
Class F Prospectus | SIMT Liquid Alternative Fund | Real Estate Investment Trusts (REITs) Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Real Estate Investment Trusts (REITs) Risk — The Fund may be exposed to REITs risk through the Fund's investments in derivatives. REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's indirect 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Corporate Fixed Income Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Corporate Fixed Income Securities Risk — The Fund may be exposed to corporate fixed income securities risk through the Fund's investments in derivatives. Corporate fixed income securities respond to economic developments, especially changes in interest rates, as well as perceptions of the creditworthiness and business prospects of individual issuers.
Class F Prospectus | SIMT Liquid Alternative Fund | To-Be-Announced (TBA) Transactions Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock To-Be-Announced (TBA) Transactions Risk — The Fund may be exposed to TBA transactions risk through the Fund's investments in derivatives. TBA purchase commitments involve a risk of loss if the value of the securities to be purchased declines prior to the settlement date or if the counterparty does not deliver the securities as promised. Selling a TBA involves a risk of loss if the value of the securities to be sold goes up prior to settlement date. TBA transactions involve counterparty risk. Default or bankruptcy of a counterparty to a TBA transaction would expose the Fund to potential loss and could affect the Fund's returns.
Class F Prospectus | SIMT Liquid Alternative Fund | Investment Style [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Investment Style — 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.
Class F Prospectus | SIMT Liquid Alternative Fund | U.S. Government Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock U.S. Government Securities Risk — The Fund may be exposed to U.S. government securities risk through the Fund's investments in derivatives. Although U.S. Government securities are considered to be among the safest investments, they are still subject to the credit risk of the U.S. Government and 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. No assurance can be given that the U.S. Government will provide financial support to its agencies and instrumentalities if it is not obligated by law to do so.
Class F Prospectus | SIMT Liquid Alternative Fund | Foreign Investment/Emerging Markets Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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, tax, accounting and audit 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. Investments in emerging markets are subject to the added risk that information in emerging market investments may be unreliable or outdated due to differences in regulatory, accounting or auditing and financial record keeping standards, or because less information about emerging market investments is publicly available. In addition, the rights and remedies associated with emerging market investments may be different than investments in developed markets. A lack of reliable information, rights and remedies increase the risks of investing in emerging markets in comparison to more developed markets. In addition, periodic U.S. Government restrictions on investments in issuers from certain foreign countries may require the Fund to sell such investments at inopportune times, which could result in losses to the Fund.
Class F Prospectus | SIMT Liquid Alternative Fund | Asset-Backed Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Asset-Backed Securities Risk — The Fund may be exposed to asset-backed securities risk through the Fund's investments in derivatives. Payment of principal and interest on asset-backed securities is dependent largely on the cash flows generated by the assets backing the securities. Securitization trusts generally do not have any assets or sources of funds other than the receivables and related property they own, and asset-backed securities are generally not insured or guaranteed by the related sponsor or any other entity. Asset-backed securities may be more illiquid than more conventional types of fixed income securities that the Fund may acquire.
Class F Prospectus | SIMT Liquid Alternative Fund | Mortgage-Backed Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Mortgage-Backed Securities Risk — The Fund may be exposed to mortgage-backed securities risk through the Fund's investments in derivatives. Mortgage-backed securities are affected significantly by the rate of prepayments and modifications of the mortgage loans backing those securities, as well as by other factors such as borrower defaults, delinquencies, realized or liquidation losses and other shortfalls. Mortgage-backed securities are particularly sensitive to prepayment risk, which is described below, given that the term to maturity for mortgage loans is generally substantially longer than the expected lives of those securities; however, the timing and amount of prepayments cannot be accurately predicted. The timing of changes in the rate of prepayments of the mortgage loans may significantly affect the Fund's actual yield to maturity on any mortgage-backed securities, even if the average rate of principal payments is consistent with the Fund's expectation. Along with prepayment risk, mortgage-backed securities are significantly affected by interest rate risk, which is described below. In a low interest rate environment, mortgage loan prepayments would generally be expected to increase due to factors such as refinancings and loan modifications at lower interest rates. In contrast, if prevailing interest rates rise, prepayments of mortgage loans would generally be expected to decline and therefore extend the weighted average lives of mortgage-backed securities held or acquired by the Fund.
Class F Prospectus | SIMT Liquid Alternative Fund | Mortgage Dollar Rolls Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Mortgage Dollar Rolls Risk — The Fund may be exposed to mortgage dollar rolls risk through the Fund's investments in derivatives. Mortgage dollar rolls are transactions in which the Fund sells securities (usually mortgage-backed securities) and simultaneously contracts to repurchase substantially similar, but not identical, securities on a specified future date. If the broker-dealer to whom the Fund sells the security becomes insolvent, the Fund's right to repurchase the security may be restricted. Other risks involved in entering into mortgage dollar rolls include the risk that the value of the security may change adversely over the term of the mortgage dollar roll and that the security the Fund is required to repurchase may be worth less than the security that the Fund originally held.
Class F Prospectus | SIMT Liquid Alternative Fund | Below Investment Grade Securities (Junk Bonds) Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Below Investment Grade Securities (Junk Bonds) Risk — The Fund may be exposed to below investment grade securities (junk bond) risk through the Fund's investments in derivatives. 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Preferred Stock Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Preferred Stock Risk — The Fund may be exposed to preferred stock risk through the Fund's investments in derivatives. 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Depositary Receipts Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Depositary Receipts Risk — The Fund may be exposed to depositary receipts risk through the Fund's investments in derivatives. Depositary receipts, such as 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, tax, accounting and audit environments.
Class F Prospectus | SIMT Liquid Alternative Fund | Cash Management Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Cash Management Risk — The value of the investments held by the Fund for cash management purposes may be affected by market risks, changing interest rates and by changes in credit ratings of the investments. To the extent that the Fund has any uninvested cash, the Fund would be subject to credit risk with respect to the depository institution holding the cash. If the Fund holds uninvested cash, the Fund will not earn income on the cash. During such periods, it may be more difficult for the Fund to achieve its investment objective.
Class F Prospectus | SIMT Liquid Alternative Fund | Money Market Funds [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Money Market Funds — An investment in a money market fund is not a bank deposit and is not insured or guaranteed by any bank, the Federal Deposit Insurance Corporation (FDIC) or any other government agency. Certain money market funds float their NAV while others seek to preserve the value of investments at a stable NAV (typically, $1.00 per share). An investment in a money market fund, even an investment in a fund seeking to maintain a stable NAV per share, is not guaranteed and it is possible for the Fund to lose money by investing in these and other types of money market funds. If the liquidity of a money market fund's portfolio deteriorates below certain levels, the money market fund may suspend redemptions (i.e., impose a redemption gate) and thereby prevent the Fund from selling its investment in the money market fund or impose a fee of up to 2% on amounts the Fund redeems from the money market fund (i.e., impose a liquidity fee). To the extent the Fund invests in derivative instruments, the Fund may hold investments, which may be significant, in money market fund shares to cover its obligations resulting from the Fund's investments in such instruments. Money market funds and the securities they invest in are subject to comprehensive regulations. The enactment of new legislation or regulations, as well as changes in interpretation and enforcement of current laws, may affect the manner of operation, performance and/or yield of money market funds.
Class F Prospectus | SIMT Liquid Alternative Fund | Commercial Paper Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Commercial Paper Risk — The Fund may be exposed to commercial paper risk through the Fund's investments in derivatives. 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Warrants Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Warrants Risk — The Fund may be exposed to warrants risk through the Fund's investments in derivatives. 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Supranational Entities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Supranational Entities Risk — The Fund may be exposed to supranational entities risk through the Fund's investments in derivatives. The Fund may invest in obligations issued or guaranteed by the World Bank. The government members, or "stockholders," usually make initial capital contributions to the World Bank and in many cases are committed to make additional capital contributions if the World Bank is unable to repay its borrowings. There is no guarantee that one or more stockholders of the World Bank will continue to make any necessary additional capital contributions. If such contributions are not made, the entity may be unable to pay interest or repay principal on its debt securities, and the Fund may lose money on such investments.
Class F Prospectus | SIMT Liquid Alternative Fund | Foreign Sovereign Debt Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Foreign Sovereign Debt Securities Risk — The Fund may be exposed to foreign sovereign debt securities risk through the Fund's investments in derivatives. The risks that (i) the governmental entity that controls the repayment of sovereign debt may not be willing or able to repay the principal and/or interest when it becomes due, because of factors such as debt service burden, political constraints, cash flow problems and other national economic factors; (ii) governments may default on their debt securities, which may require holders of such securities to participate in debt rescheduling or additional lending to defaulting governments; and (iii) there is no bankruptcy proceeding by which defaulted sovereign debt may be collected in whole or in part.
Class F Prospectus | SIMT Liquid Alternative Fund | Quantitative Investing Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Quantitative Investing Risk — A quantitative investment style generally involves the use of computers to implement a systematic or rules-based approach to selecting investments based on specific measurable factors. Due to the significant role technology plays in such strategies, they carry the risk of unintended or unrecognized issues or flaws in the design, coding, implementation or maintenance of the computer programs or technology used in the development and implementation of the quantitative strategy.
Class F Prospectus | SIMT Liquid Alternative Fund | Liquidity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_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.
Class F Prospectus | SIMT Liquid Alternative Fund | Leverage Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Credit Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Tax Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Tax Risk — To the extent the Fund invests in commodities and commodity derivatives, it will seek to restrict its income from such investments that do not generate qualifying income, to a maximum of 10% of its gross income (when combined with its other investments that produce non-qualifying income) to permit the Fund to comply with certain qualifying income tests necessary for the Fund to qualify as a regulated investment company (RIC) under Subchapter M of the Internal Revenue Code of 1986, as amended (the Code). However, the Fund may generate more non-qualifying income than anticipated, may not be able to generate qualifying income in a particular taxable year at levels sufficient to meet the qualifying income test, or may not be able to accurately predict the non-qualifying income from these investments. Failure to comply with the qualifying income test could have significant negative consequences to Fund shareholders. The tax treatment of the commodity futures in which the Fund invests may be affected by future regulatory or legislative changes that could affect the character, timing and/or amount of the Fund's taxable income or gains and distributions.
Class F Prospectus | SIMT Liquid Alternative Fund | Portfolio Turnover Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and taxes subject to ordinary income tax rates as opposed to more favorable capital gains rates, which may affect the Fund's performance.
Class F Prospectus | SIMT Liquid Alternative Fund | Interest Rate Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Interest Rate Risk — The risk that a change in interest rates will cause a fall in the value of fixed income securities, including U.S. Government securities. Generally, the value of fixed income securities will vary inversely with the direction of prevailing interest rates. Changing interest rates may have unpredictable effects on the markets and may affect the value and liquidity of instruments held. 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Duration Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Duration Risk — Longer-term securities 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Extension Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Extension Risk — The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value.
Class F Prospectus | SIMT Liquid Alternative Fund | Prepayment Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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, which may cause proceeds to be reinvested 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.
Class F Prospectus | SIMT Liquid Alternative Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock You could lose money on your investment in the Fund, just as you could with other investments.
Class F Prospectus | SIMT Liquid Alternative Fund | Class F  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.62% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.12%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 114
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 356
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 114
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 356
[1] Other Expenses are based on estimated amounts for the current fiscal year.