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Investment Objectives and Goals
Jan. 28, 2026
LARGE CAP FUND - Class F Prospectus | SIMT Large Cap Fund  
Prospectus [Line Items]  
Risk/Return [Heading] LARGE CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term growth of capital and income.
LARGE CAP VALUE FUND - Class F Prospectus | SIMT LARGE CAP VALUE FUND  
Prospectus [Line Items]  
Risk/Return [Heading] LARGE CAP VALUE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term growth of capital and income.
LARGE CAP GROWTH FUND - Class F Prospectus | SIMT LARGE CAP GROWTH FUND  
Prospectus [Line Items]  
Risk/Return [Heading] LARGE CAP GROWTH FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation.
LARGE CAP INDEX FUND - Class F Prospectus | SIMT Large Cap Index Fund  
Prospectus [Line Items]  
Risk/Return [Heading] LARGE CAP INDEX FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks.
TAX-MANAGED LARGE CAP FUND - Class F Prospectus | SIMT TAX-MANAGED LARGE CAP FUND  
Prospectus [Line Items]  
Risk/Return [Heading] TAX-MANAGED LARGE CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

High long-term after-tax returns.
S&P 500 INDEX FUND - Class F Prospectus | SIMT S&P 500 Index Fund  
Prospectus [Line Items]  
Risk/Return [Heading] S&P 500 INDEX FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Investment results that correspond to the aggregate price and dividend performance of the securities in the S&P 500 Index.
SMALL CAP FUND - Class F Prospectus | SIMT Small Cap Fund  
Prospectus [Line Items]  
Risk/Return [Heading] SMALL CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation.
SMALL CAP VALUE FUND - Class F Prospectus | SIMT SMALL CAP VALUE FUND  
Prospectus [Line Items]  
Risk/Return [Heading] SMALL CAP VALUE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation.
SMALL CAP GROWTH FUND - Class F Prospectus | SIMT SMALL CAP GROWTH FUND  
Prospectus [Line Items]  
Risk/Return [Heading] SMALL CAP GROWTH FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term capital appreciation.
TAX-MANAGED SMALL/MID CAP FUND - Class F Prospectus | SIMT TAX-MANAGED SMALL/MID CAP FUND  
Prospectus [Line Items]  
Risk/Return [Heading] TAX-MANAGED SMALL/MID CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

High long-term after-tax returns.
MID-CAP FUND - Class F Prospectus | SIMT MID CAP FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MID-CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term capital appreciation.
U.S. MANAGED VOLATILITY FUND - Class F Prospectus | SIMT US MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Risk/Return [Heading] U.S. MANAGED VOLATILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation with less volatility than the broad U.S. equity markets.
GLOBAL MANAGED VOLATILITY FUND - Class F Prospectus | SIMT GLOBAL MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Risk/Return [Heading] GLOBAL MANAGED VOLATILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation with less volatility than the broad global equity markets.
Tax-Managed Managed Volatility Fund - Class F Prospectus | SIMT Tax-Managed Managed Volatility Fund  
Prospectus [Line Items]  
Risk/Return [Heading] TAX-MANAGED MANAGED VOLATILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

To maximize after-tax returns, but with a lower level of volatility than the broad U.S. equity markets.
Tax-Managed International Managed Volatility Fund - Class F Prospectus | SIMT Tax-Managed International Managed Volatility Fund  
Prospectus [Line Items]  
Risk/Return [Heading] TAX-MANAGED INTERNATIONAL MANAGED VOLATILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Tax-sensitive long-term capital appreciation with less volatility than the broad international equity markets.
REAL ESTATE FUND - Class F Prospectus | SIMT REAL ESTATE FUND  
Prospectus [Line Items]  
Risk/Return [Heading] REAL ESTATE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return, including current income and capital appreciation.
CORE FIXED INCOME FUND - Class F Prospectus | SIMT CORE FIXED INCOME FUND  
Prospectus [Line Items]  
Risk/Return [Heading] CORE FIXED INCOME FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Current income consistent with the preservation of capital.
HIGH YIELD BOND FUND - Class F Prospectus | SIMT HIGH YIELD BOND FUND  
Prospectus [Line Items]  
Risk/Return [Heading] HIGH YIELD BOND FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return.
CONSERVATIVE INCOME FUND - Class F Prospectus | SIMT Conservative Income Fund  
Prospectus [Line Items]  
Risk/Return [Heading] CONSERVATIVE INCOME FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Principal preservation and a high degree of liquidity while providing current income.
TAX-FREE CONSERVATIVE INCOME FUND - Class F Prospectus | SIMT Tax-Free Conservative Income Fund  
Prospectus [Line Items]  
Risk/Return [Heading] TAX-FREE CONSERVATIVE INCOME FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Preserving principal value and maintaining a high degree of liquidity while providing current income exempt from federal income taxes.
REAL RETURN FUND - Class F Prospectus | SIMT Real Return Fund  
Prospectus [Line Items]  
Risk/Return [Heading] REAL RETURN FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return exceeding the rate of inflation.
DYNAMIC ASSET ALLOCATION FUND - Class F Prospectus | SIMT Dynamic Asset Allocation Fund  
Prospectus [Line Items]  
Risk/Return [Heading] DYNAMIC ASSET ALLOCATION FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term total return.
MULTI-STRATEGY ALTERNATIVE FUND - Class F Prospectus | SIMT Multi-Strategy Alternative Fund  
Prospectus [Line Items]  
Risk/Return [Heading] MULTI-STRATEGY ALTERNATIVE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

The Fund allocates its assets among a variety of investment strategies to seek to generate an absolute return with reduced correlation to the stock and bond markets.
LARGE CAP FUND - Class I Prospectus | SIMT Large Cap Fund  
Prospectus [Line Items]  
Risk/Return [Heading] LARGE CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term growth of capital and income.
LARGE CAP VALUE FUND - Class I Prospectus | SIMT LARGE CAP VALUE FUND  
Prospectus [Line Items]  
Risk/Return [Heading] LARGE CAP VALUE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term growth of capital and income.
LARGE CAP GROWTH FUND - Class I Prospectus | SIMT LARGE CAP GROWTH FUND  
Prospectus [Line Items]  
Risk/Return [Heading] LARGE CAP GROWTH FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation.
S&P 500 Index Fund - Class I Prospectus | SIMT S&P 500 Index Fund  
Prospectus [Line Items]  
Risk/Return [Heading] S&P 500 INDEX FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Investment results that correspond to the aggregate price and dividend performance of the securities in the S&P 500 Index.
SMALL CAP FUND - Class I Prospectus | SIMT Small Cap Fund  
Prospectus [Line Items]  
Risk/Return [Heading] SMALL CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation.
SMALL CAP VALUE FUND - Class I Prospectus | SIMT SMALL CAP VALUE FUND  
Prospectus [Line Items]  
Risk/Return [Heading] SMALL CAP VALUE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation.
SMALL CAP GROWTH FUND - Class I Prospectus | SIMT SMALL CAP GROWTH FUND  
Prospectus [Line Items]  
Risk/Return [Heading] SMALL CAP GROWTH FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term capital appreciation.
MID-CAP FUND - Class I Prospectus | SIMT MID CAP FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MID-CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term capital appreciation.
U.S. MANAGED VOLATILITY FUND - Class I Prospectus | SIMT US MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Risk/Return [Heading] U.S. MANAGED VOLATILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation with less volatility than the broad U.S. equity markets.
GLOBAL MANAGED VOLATILITY FUND - Class I Prospectus | SIMT GLOBAL MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Risk/Return [Heading] GLOBAL MANAGED VOLATILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation with less volatility than the broad global equity markets.
REAL ESTATE FUND - Class I Prospectus | SIMT REAL ESTATE FUND  
Prospectus [Line Items]  
Risk/Return [Heading] REAL ESTATE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return, including current income and capital appreciation.
CORE FIXED INCOME FUND - Class I Prospectus | SIMT CORE FIXED INCOME FUND  
Prospectus [Line Items]  
Risk/Return [Heading] CORE FIXED INCOME FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Current income consistent with the preservation of capital.
HIGH YIELD BOND FUND - Class I Prospectus | SIMT HIGH YIELD BOND FUND  
Prospectus [Line Items]  
Risk/Return [Heading] HIGH YIELD BOND FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return.
REAL RETURN FUND - Class I Prospectus | SIMT Real Return Fund  
Prospectus [Line Items]  
Risk/Return [Heading] REAL RETURN FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return exceeding the rate of inflation.
LARGE CAP FUND - Class Y Prospectus | SIMT Large Cap Fund  
Prospectus [Line Items]  
Risk/Return [Heading] LARGE CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term growth of capital and income.
LARGE CAP VALUE FUND - Class Y Prospectus | SIMT LARGE CAP VALUE FUND  
Prospectus [Line Items]  
Risk/Return [Heading] LARGE CAP VALUE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term growth of capital and income.
LARGE CAP GROWTH FUND - Class Y Prospectus | SIMT LARGE CAP GROWTH FUND  
Prospectus [Line Items]  
Risk/Return [Heading] LARGE CAP GROWTH FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation.
TAX-MANAGED LARGE CAP FUND - Class Y Prospectus | SIMT TAX-MANAGED LARGE CAP FUND  
Prospectus [Line Items]  
Risk/Return [Heading] TAX-MANAGED LARGE CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

High long-term after-tax returns.
SMALL CAP FUND - Class Y Prospectus | SIMT Small Cap Fund  
Prospectus [Line Items]  
Risk/Return [Heading] SMALL CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation.
SMALL CAP VALUE FUND - Class Y Prospectus | SIMT SMALL CAP VALUE FUND  
Prospectus [Line Items]  
Risk/Return [Heading] SMALL CAP VALUE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation.
SMALL CAP GROWTH FUND - Class Y Prospectus | SIMT SMALL CAP GROWTH FUND  
Prospectus [Line Items]  
Risk/Return [Heading] SMALL CAP GROWTH FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term capital appreciation.
TAX-MANAGED SMALL/MID CAP FUND - Class Y Prospectus | SIMT TAX-MANAGED SMALL/MID CAP FUND  
Prospectus [Line Items]  
Risk/Return [Heading] TAX-MANAGED SMALL/MID CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

High long-term after-tax returns.
MID-CAP FUND - Class Y Prospectus | SIMT MID CAP FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MID-CAP FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term capital appreciation.
U.S. MANAGED VOLATILITY FUND - Class Y Prospectus | SIMT US MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Risk/Return [Heading] U.S. MANAGED VOLATILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation with less volatility than the broad U.S. equity markets.
GLOBAL MANAGED VOLATILITY FUND - Class Y Prospectus | SIMT GLOBAL MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Risk/Return [Heading] GLOBAL MANAGED VOLATILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Capital appreciation with less volatility than the broad global equity markets.
TAX-MANAGED MANAGED VOLATILITY FUND - Class Y Prospectus | SIMT Tax-Managed Managed Volatility Fund  
Prospectus [Line Items]  
Risk/Return [Heading] TAX-MANAGED MANAGED VOLATILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

To maximize after-tax returns, but with a lower level of volatility than the broad U.S. equity markets.
TAX-MANAGED INTERNATIONAL MANAGED VOLATILITY FUND - Class Y Prospectus | SIMT Tax-Managed International Managed Volatility Fund  
Prospectus [Line Items]  
Risk/Return [Heading] TAX-MANAGED INTERNATIONAL MANAGED VOLATILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Tax-sensitive long-term capital appreciation with less volatility than the broad international equity markets.
REAL ESTATE FUND - Class Y Prospectus | SIMT REAL ESTATE FUND  
Prospectus [Line Items]  
Risk/Return [Heading] REAL ESTATE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return, including current income and capital appreciation.
CORE FIXED INCOME FUND - Class Y Prospectus | SIMT CORE FIXED INCOME FUND  
Prospectus [Line Items]  
Risk/Return [Heading] CORE FIXED INCOME FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Current income consistent with the preservation of capital.
HIGH YIELD BOND FUND - Class Y Prospectus | SIMT HIGH YIELD BOND FUND  
Prospectus [Line Items]  
Risk/Return [Heading] HIGH YIELD BOND FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return.
CONSERVATIVE INCOME FUND - Class Y Prospectus | SIMT Conservative Income Fund  
Prospectus [Line Items]  
Risk/Return [Heading] CONSERVATIVE INCOME FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Principal preservation and a high degree of liquidity while providing current income.
TAX-FREE CONSERVATIVE INCOME FUND - Class Y Prospectus | SIMT Tax-Free Conservative Income Fund  
Prospectus [Line Items]  
Risk/Return [Heading] TAX-FREE CONSERVATIVE INCOME FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Preserving principal value and maintaining a high degree of liquidity while providing current income exempt from federal income taxes.
REAL RETURN FUND - Class Y Prospectus | SIMT Real Return Fund  
Prospectus [Line Items]  
Risk/Return [Heading] REAL RETURN FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return exceeding the rate of inflation.
DYNAMIC ASSET ALLOCATION FUND - Class Y Prospectus | SIMT Dynamic Asset Allocation Fund  
Prospectus [Line Items]  
Risk/Return [Heading] DYNAMIC ASSET ALLOCATION FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Long-term total return.
MULTI-STRATEGY ALTERNATIVE FUND - Class Y Prospectus | SIMT Multi-Strategy Alternative Fund  
Prospectus [Line Items]  
Risk/Return [Heading] MULTI-STRATEGY ALTERNATIVE FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

The Fund allocates its assets among a variety of investment strategies to seek to generate an absolute return with reduced correlation to the stock and bond markets.
MULTI-ASSET ACCUMULATION FUND - Class F Prospectus | SIMT MULTI-ASSET ACCUMULATION FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MULTI-ASSET ACCUMULATION FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return, including capital appreciation and income.
MULTI-ASSET INCOME FUND - Class F Prospectus | SIMT MULTI-ASSET INCOME FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MULTI-ASSET INCOME FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

The Fund seeks total return with an emphasis on current income.
MULTI-ASSET INFLATION MANAGED FUND - Class F Prospectus | SIMT MULTI-ASSET INFLATION MANAGED FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MULTI-ASSET INFLATION MANAGED FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return exceeding the rate of inflation.
MULTI-ASSET CAPITAL STABILITY FUND - Class F Prospectus | SIMT MULTI-ASSET CAPITAL STABILITY FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MULTI-ASSET CAPITAL STABILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Manage risk of a loss while providing current income and an opportunity for capital appreciation.
MULTI-ASSET ACCUMULATION FUND - Class Y Prospectus | SIMT MULTI-ASSET ACCUMULATION FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MULTI-ASSET ACCUMULATION FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return, including capital appreciation and income.
MULTI-ASSET INCOME FUND - Class Y Prospectus | SIMT MULTI-ASSET INCOME FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MULTI-ASSET INCOME FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

The Fund seeks total return with an emphasis on current income.
MULTI-ASSET INFLATION MANAGED FUND - Class Y Prospectus | SIMT MULTI-ASSET INFLATION MANAGED FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MULTI-ASSET INFLATION MANAGED FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Total return exceeding the rate of inflation.
MULTI-ASSET CAPITAL STABILITY FUND - Class Y Prospectus | SIMT MULTI-ASSET CAPITAL STABILITY FUND  
Prospectus [Line Items]  
Risk/Return [Heading] MULTI-ASSET CAPITAL STABILITY FUND
Objective [Heading] Investment Goal
Objective, Primary [Text Block]

Manage risk of a loss while providing current income and an opportunity for capital appreciation.