Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Jan. 31, 2012
SIMT GLOBAL MANAGED VOLATILITY FUND (First Prospectus Summary) | SIMT GLOBAL MANAGED VOLATILITY FUND
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return, Heading	rr_RiskReturnHeading	GLOBAL MANAGED VOLATILITY FUND
Investment Objective, Heading	rr_ObjectiveHeading	Investment Goal
investment Objective, Primary	rr_ObjectivePrimaryTextBlock	Capital appreciation with less volatility than the broad global equity markets.
Expense, Heading	rr_ExpenseHeading	Fees and Expenses
Expense, Narrative	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold Fund shares.
Shareholder Fees, Caption	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses, Caption	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	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 68% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	68.00%
Expense Example, Heading	rr_ExpenseExampleHeading	EXAMPLE
Expense Example, Narrative	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	rr_ExpenseExampleByYearCaption	Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Investment Strategy, Heading	rr_StrategyHeading	Principal Investment Strategies
Investment Strategy, Narrative	rr_StrategyNarrativeTextBlock	The Global Managed Volatility Fund will typically invest in securities of U.S. and foreign companies of all capitalization ranges. These securities may include common stocks, preferred stocks, warrants, depositary receipts and ETFs. The Fund also may use futures contracts and forward contracts. Under normal circumstances, the Fund will invest in at least three countries outside of the U.S., but will typically invest much more broadly. It is expected that at least 40% of the Fund's assets will be invested in non-U.S. securities. The Fund will invest primarily in companies located in developed countries, but may also invest in companies located in emerging markets. The Fund uses a multi-manager approach, relying on a number of Sub-Advisers with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SIMC. This approach is intended to manage the risk characteristics of the Fund. The Fund is expected to achieve an absolute return of the broad global equity markets, but with a lower absolute volatility. Over the long term, the Fund is expected to achieve a return similar to that of the MSCI World Equity Index, but with a lower level of volatility. However, given that the Fund's investment strategy focuses on absolute return and risk, the Fund's country, sector and market capitalization exposures will typically vary from the index and may cause significant performance deviations relative to the index over shorter-term periods. The Fund seeks to achieve lower volatility by constructing a portfolio of securities that the Sub-Advisers believe would produce a less volatile return stream to the market. Each Sub-Adviser effectively weighs securities based on their total expected risk and return without regard to market capitalization and industry. In managing the Fund's currency exposure for foreign securities, the Fund may buy and sell futures or forward contracts on currencies for hedging purposes.
Risk, Heading	rr_RiskHeading	Principal Risks
Risk, Narrative	rr_RiskNarrativeTextBlock	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. Currency Risk - As a result of the Fund's investments in securities or other investments denominated in, and/or receiving revenues in, foreign currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected. Depositary Receipts Risk - 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 and tax environments. Derivatives Risk - The Fund's use of futures contracts and forward contracts is subject to market risk, leverage risk, correlation risk and liquidity risk. Leverage risk and liquidity risk are described below. Market risk is the risk that the market value of an investment may move up and down, sometimes rapidly and unpredictably. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. The Fund's use of forward contracts is also subject to credit risk and valuation risk. Valuation risk is the risk that the derivative may be difficult to value and/or valued incorrectly. Credit risk is described above. Each of these risks could cause the Fund to lose more than the principal amount invested in a derivative instrument. Equity Market Risk - The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) 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. Foreign Investment/Emerging Markets Risk - The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. These additional risks may be heightened with respect to emerging market countries since political turmoil and rapid changes in economic conditions are more likely to occur in these countries. Investment Style Risk - The risk that securities selected as part of a managed volatility strategy may underperform other segments of the equity markets or the equity markets as a whole. Leverage Risk - 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. 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, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk - Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Small and Medium Capitalization Companies Risk - The smaller and medium capitalization companies in which the Fund invests 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 and medium capitalization stocks may be more volatile than those of larger companies. Small and medium capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund.
Risk, Lose Money	rr_RiskLoseMoney	Loss of money is a risk of investing in the Fund.
Bar Chart and Performance Table, Heading	rr_BarChartAndPerformanceTableHeading	Performance Information
Performance, Narrative	rr_PerformanceNarrativeTextBlock	The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compared 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	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compared with those of a broad measure of market performance.
Performance, Availability Phone Number	rr_PerformanceAvailabilityPhone	1-800-DIAL-SEI
Performance, Past Does Not Indicate Future	rr_PerformancePastDoesNotIndicateFuture	The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart, Closing	rr_BarChartClosingTextBlock	Best Quarter: 7.57% (09/30/09) Worst Quarter: -15.33% (12/31/08)
Performance Table, Heading	rr_PerformanceTableHeading	Average Annual Total Returns (for the periods ended December 31, 2011)
Index No Deduction for Fees, Expenses, Taxes	rr_IndexNoDeductionForFeesExpensesTaxes	reflects no deduction for fees, expenses or taxes
Performance Table, Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table, Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table, Narrative	rr_PerformanceTableNarrativeTextBlock	This table compares the Fund's average annual total returns for Class A Shares to those of a broad-based index and the MSCI World Minimum Volatility Index, 100% Hedged to USD, which is a secondary index designed to serve as a transparent and relevant benchmark for managed volatility equity strategies across the developed market world. This index aims to reflect the performance characteristics of a minimum-variance or managed volatility equity strategy focused on absolute return and volatility with the lowest absolute risk. 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.
SIMT GLOBAL MANAGED VOLATILITY FUND (First Prospectus Summary) | SIMT GLOBAL MANAGED VOLATILITY FUND | MSCI World Index, Hedged Return
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	MSCI World Index, Hedged Return (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	(5.46%)
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	(2.44%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	(0.14%)
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 27, 2006	[1]
SIMT GLOBAL MANAGED VOLATILITY FUND (First Prospectus Summary) | SIMT GLOBAL MANAGED VOLATILITY FUND | MSCI World Minimum Volatility Index, 100% Hedged to USD Return
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	MSCI World Minimum Volatility Index, 100% Hedged to USD Return (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	7.29%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.24%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	3.44%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 27, 2006	[1]
SIMT GLOBAL MANAGED VOLATILITY FUND (First Prospectus Summary) | SIMT GLOBAL MANAGED VOLATILITY FUND | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Redemption Fee (applies to a redemption, or series of redemptions, from a single identifiable source that, in the aggregate, exceeds $25 million within any thirty (30) day period)	rr_RedemptionFeeOverRedemption	(0.75%)
Management Fees	rr_ManagementFeesOverAssets	0.65%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.64%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.29%
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	131
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	409
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	708
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	1,556
Annual Return 2007	rr_AnnualReturn2007	0.03%
Annual Return 2008	rr_AnnualReturn2008	(27.13%)
Annual Return 2009	rr_AnnualReturn2009	3.89%
Annual Return 2010	rr_AnnualReturn2010	7.17%
Annual Return 2011	rr_AnnualReturn2011	4.58%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	7.57%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(15.33%)
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class A Return Before Taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	4.58%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	(3.23%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	(1.17%)
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 27, 2006
SIMT GLOBAL MANAGED VOLATILITY FUND (First Prospectus Summary) | SIMT GLOBAL MANAGED VOLATILITY FUND | Class A | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class A Return After Taxes on Distributions
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	4.58%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	(3.42%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	(1.42%)
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 27, 2006
SIMT GLOBAL MANAGED VOLATILITY FUND (First Prospectus Summary) | SIMT GLOBAL MANAGED VOLATILITY FUND | Class A | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class A Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	2.98%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	(2.78%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	(1.08%)
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 27, 2006

[1] Index returns are shown from July 31, 2006.