XML 16 R9.htm IDEA: XBRL DOCUMENT v3.3.1.900
Label Element Value
Class A Prospectus | SIMT Tax-Free Conservative Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading SIMT Tax-Free Conservative Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Preserving principal value and maintaining a high degree of liquidity while providing current income exempt from federal income taxes.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold Fund shares.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
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 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 Tax-Free Conservative Income Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in US dollar-denominated municipal securities that the Fund's sub-adviser (the Sub-Adviser) believes present minimal credit risks to the Fund and that pay interest that (i) is exempt from federal income taxes and (ii) is not taxable under the federal alternative minimum tax applicable to individuals. The principal issuers of these securities are state and local governments and their agencies located in any of the fifty states, the District of Columbia, Puerto Rico and other U.S. territories and possessions.


Under normal market conditions, the Fund will primarily invest in short-term US dollar-denominated debt securities including: US municipal bonds, notes, variable rate demand notes, tender option bonds, floating rate notes, industrial development bonds, pre-refunded bonds and commercial paper. The Fund may also, to a limited extent, invest in repurchase agreements and securities subject to the alternative minimum tax or in debt securities subject to federal income tax. Although the Fund may invest in securities with any maturity or duration, the Fund generally seeks to maintain a weighted average maturity of 90 days or less.


The Fund uses a Sub-Adviser to manage the Fund's portfolio under the general supervision of SEI Investments Management Corporation, the Fund's adviser (SIMC or the Adviser). Through analysis of both macroeconomic factors and individual company attributes, the Sub-Adviser seeks to invest in securities that are marketable and liquid, offer competitive yields, and are of issuers that represent low credit risk. In selecting securities, the Sub-Adviser considers factors such as the anticipated level of interest rates and the maturity of individual securities relative to the maturity of the Fund as a whole.


The Fund is not a money market fund and does not seek to maintain a stable net asset value.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Call Risk — Issuers of callable bonds may call (redeem) securities with higher coupons or interest rates before their maturity dates. The Fund may be forced to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund's income. Bonds may be called due to falling interest rates or non-economical circumstances.


Credit Risk — The Fund could lose money if the issuer or guarantor of a portfolio security or a counterparty to a contract fails to make timely payment or otherwise honor its obligations. If the Fund purchases securities supported by credit enhancements from banks and other financial institutions, changes in the credit quality of these institutions could cause losses to the Fund and affect its share price.


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


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 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.


Income Risk — An investment in the Fund is subject to income risk, which is the possibility that the Fund's yield will decline due to falling interest rates.


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. During periods when interest rates are low, the Fund's yield (and total return) also will be low and the income generated by the Fund may not be sufficient to offset all or a significant portion of the Fund's expenses, which could impair the Fund's ability to provide a positive yield.


Market Risk — The risk that the market value of a security may move up and down, sometimes rapidly and unpredictably. The Fund's net asset value per share will fluctuate with the market prices of its portfolio securities. Market risk may affect a single issuer, an industry, a sector or the equity or bond market as a whole. Although the Fund may have an investment portfolio of short-term debt securities that is similar to the investment portfolios of many money market funds, the Fund is not a money market fund, does not seek to maintain a stable net asset value per share, and does not provide investors with the same regulatory protections as a money market fund. Under normal conditions, the Fund's investments may be more susceptible than a money market fund to interest rate risk, valuation risk, credit risk and other risks relevant to the Fund's investments. Certain of the Fund's investments may not be permitted investments of a money market fund.


Municipal Securities Risk — Municipal securities, like other fixed income securities, rise and fall in value in response to economic and market factors, primarily changes in interest rates, and actual or perceived credit quality. Rising interest rates will generally cause municipal securities to decline in value. Longer-term securities usually respond more sharply to interest rate changes than do shorter-term securities. A municipal security will also lose value if, due to rating downgrades or other factors, there are concerns about the issuer's current or future ability to make principal or interest payments. State and local governments rely on taxes and, to some extent, revenues from private projects financed by municipal securities, to pay interest and principal on municipal debt. Poor statewide or local economic results or changing political sentiments may reduce tax revenues and increase the expenses of municipal issuers, making it more difficult for them to meet their obligations. Actual or perceived erosion of the creditworthiness of municipal issuers may reduce the value of the Fund's holdings. As a result, the Fund will be more susceptible to factors that adversely affect issuers of municipal obligations than a mutual fund that does not have as great a concentration in municipal obligations. Municipal obligations may be underwritten or guaranteed by a relatively small number of financial services firms, so changes in the municipal securities market that affect those firms may decrease the availability of municipal instruments in the market, thereby making it difficult for the Sub-Adviser to identify and obtain appropriate investments for the Fund's portfolio. Also, there may be economic or political changes that impact the ability of issuers of municipal securities to repay principal and to make interest payments on securities owned by the Fund. Any changes in the financial condition of municipal issuers may also adversely affect the value of the Fund's securities.


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.


Repurchase Agreement Risk — Although the Fund's repurchase agreement transactions will be fully collateralized at all times, they generally create leverage and involve some counterparty risk to the Fund whereby a defaulting counterparty could delay or prevent the Fund's recovery of collateral.


Taxation Risk — The Fund may invest a portion of its assets in securities that generate income that is subject to federal, state and local income tax, including the federal alternative minimum tax.


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.


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.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on your investment in the Fund, just as you could with other investments.
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 A Prospectus | SIMT Tax-Free Conservative Income Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.10%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.49% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.59%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 60
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 189
[1] Other Expenses are based on estimated amounts for the current fiscal year.