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Fees and Expenses
Jan. 28, 2026
LARGE CAP FUND - Class F Prospectus | SIMT Large Cap Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.39

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

0.98

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Large Cap Fund — Class F Shares

 

$

100

   

$

312

   

$

542

   

$

1,201

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 42% of the average value of its portfolio.

Portfolio Turnover, Rate 42.00%
LARGE CAP VALUE FUND - Class F Prospectus | SIMT LARGE CAP VALUE FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.35

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

0.94

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Large Cap Value Fund — Class F Shares

 

$

96

   

$

300

   

$

520

   

$

1,155

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 28% of the average value of its portfolio.

Portfolio Turnover, Rate 28.00%
LARGE CAP GROWTH FUND - Class F Prospectus | SIMT LARGE CAP GROWTH FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.40

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.58

%

 

Total Annual Fund Operating Expenses

   

0.98

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Large Cap Growth Fund — Class F Shares

 

$

100

   

$

312

   

$

542

   

$

1,201

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 63% of the average value of its portfolio.

Portfolio Turnover, Rate 63.00%
LARGE CAP INDEX FUND - Class F Prospectus | SIMT Large Cap Index Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.05

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

0.64

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Large Cap Index Fund — Class F Shares

 

$

65

   

$

205

   

$

357

   

$

798

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 4% of the average value of its portfolio.

Portfolio Turnover, Rate 4.00%
TAX-MANAGED LARGE CAP FUND - Class F Prospectus | SIMT TAX-MANAGED LARGE CAP FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.40

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.51

%

 

Total Annual Fund Operating Expenses

   

0.91

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Tax-Managed Large Cap Fund — Class F Shares

 

$

93

   

$

290

   

$

504

   

$

1,120

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 14% of the average value of its portfolio.

Portfolio Turnover, Rate 14.00%
S&P 500 INDEX FUND - Class F Prospectus | SIMT S&P 500 Index Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.03

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.51

%

 

Total Annual Fund Operating Expenses

   

0.54

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

S&P 500 Index Fund — Class F Shares

 

$

55

   

$

173

   

$

302

   

$

677

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 3% of the average value of its portfolio.

Portfolio Turnover, Rate 3.00%
SMALL CAP FUND - Class F Prospectus | SIMT Small Cap Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.58

%

 

Total Annual Fund Operating Expenses

   

1.23

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Small Cap Fund — Class F Shares

 

$

125

   

$

390

   

$

676

   

$

1,489

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 80% of the average value of its portfolio.

Portfolio Turnover, Rate 80.00%
SMALL CAP VALUE FUND - Class F Prospectus | SIMT SMALL CAP VALUE FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

1.24

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Small Cap Value Fund — Class F Shares

 

$

126

   

$

393

   

$

681

   

$

1,500

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 48% of the average value of its portfolio.

Portfolio Turnover, Rate 48.00%
SMALL CAP GROWTH FUND - Class F Prospectus | SIMT SMALL CAP GROWTH FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

1.24

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Small Cap Growth Fund — Class F Shares

 

$

126

   

$

393

   

$

681

   

$

1,500

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 155% of the average value of its portfolio.

Portfolio Turnover, Rate 155.00%
TAX-MANAGED SMALL/MID CAP FUND - Class F Prospectus | SIMT TAX-MANAGED SMALL/MID CAP FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

1.24

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Tax-Managed Small/Mid Cap Fund — Class F Shares

 

$

126

   

$

393

   

$

681

   

$

1,500

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 36% of the average value of its portfolio.

Portfolio Turnover, Rate 36.00%
MID-CAP FUND - Class F Prospectus | SIMT MID CAP FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.40

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

0.99

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Mid-Cap Fund — Class F Shares

 

$

101

   

$

315

   

$

547

   

$

1,213

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 62% of the average value of its portfolio.

Portfolio Turnover, Rate 62.00%
U.S. MANAGED VOLATILITY FUND - Class F Prospectus | SIMT US MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.55

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

1.14

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

U.S. Managed Volatility Fund — Class F Shares

 

$

116

   

$

362

   

$

628

   

$

1,386

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 68.00%
GLOBAL MANAGED VOLATILITY FUND - Class F Prospectus | SIMT GLOBAL MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

1.24

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Global Managed Volatility Fund — Class F Shares

 

$

126

   

$

393

   

$

681

   

$

1,500

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 78% of the average value of its portfolio.

Portfolio Turnover, Rate 78.00%
Tax-Managed Managed Volatility Fund - Class F Prospectus | SIMT Tax-Managed Managed Volatility Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.55

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

1.14

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs and may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Tax-Managed Managed Volatility Fund — Class F Shares

 

$

116

   

$

362

   

$

628

   

$

1,386

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 43% of the average value of its portfolio.

Portfolio Turnover, Rate 43.00%
Tax-Managed International Managed Volatility Fund - Class F Prospectus | SIMT Tax-Managed International Managed Volatility Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.73

%

 

Total Annual Fund Operating Expenses

   

1.38

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Tax-Managed International Managed Volatility Fund — Class F Shares

 

$

140

   

$

437

   

$

755

   

$

1,657

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 66% of the average value of its portfolio.

Portfolio Turnover, Rate 66.00%
REAL ESTATE FUND - Class F Prospectus | SIMT REAL ESTATE FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.59

%

 

Total Annual Fund Operating Expenses

   

1.24

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Real Estate Fund — Class F Shares

 

$

126

   

$

393

   

$

681

   

$

1,500

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 72% of the average value of its portfolio.

Portfolio Turnover, Rate 72.00%
CORE FIXED INCOME FUND - Class F Prospectus | SIMT CORE FIXED INCOME FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.28

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.46

%

 

Total Annual Fund Operating Expenses

   

0.74

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Core Fixed Income Fund — Class F Shares

 

$

76

   

$

237

   

$

411

   

$

918

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 394% of the average value of its portfolio.

Portfolio Turnover, Rate 394.00%
HIGH YIELD BOND FUND - Class F Prospectus | SIMT HIGH YIELD BOND FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.49

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.50

%

 

Total Annual Fund Operating Expenses

   

0.99

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

High Yield Bond Fund — Class F Shares

 

$

101

   

$

315

   

$

547

   

$

1,213

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 66% of the average value of its portfolio.

Portfolio Turnover, Rate 66.00%
CONSERVATIVE INCOME FUND - Class F Prospectus | SIMT Conservative Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.10

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.49

%

 

Total Annual Fund Operating Expenses

   

0.59

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Conservative Income Fund — Class F Shares

 

$

60

   

$

189

   

$

329

   

$

738

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 0% of the average value of its portfolio.

Portfolio Turnover, Rate none
TAX-FREE CONSERVATIVE INCOME FUND - Class F Prospectus | SIMT Tax-Free Conservative Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.10

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.49

%

 

Total Annual Fund Operating Expenses

   

0.59

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Tax-Free Conservative Income Fund — Class F Shares

 

$

60

   

$

189

   

$

329

   

$

738

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 0% of the average value of its portfolio.

Portfolio Turnover, Rate none
REAL RETURN FUND - Class F Prospectus | SIMT Real Return Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.22

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.48

%

 

Total Annual Fund Operating Expenses

   

0.70

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Real Return Fund — Class F Shares

 

$

72

   

$

224

   

$

390

   

$

871

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 29% of the average value of its portfolio.

Portfolio Turnover, Rate 29.00%
DYNAMIC ASSET ALLOCATION FUND - Class F Prospectus | SIMT Dynamic Asset Allocation Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees (of the Fund and Subsidiary)

 

Management of the Fund

   

0.60

%

     

Management of the Subsidiary

   

None

       

Total Management Fees

       

0.60

%

 

Distribution (12b-1) Fees

       

None

   

Other Expenses (of the Fund and Subsidiary)

 

Other Expenses of the Fund

   

0.58

%

     

Other Expenses of the Subsidiary

   

None

       

Total Other Expenses

       

0.58

%

 

Total Annual Fund Operating Expenses

       

1.18

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Dynamic Asset Allocation Fund — Class F Shares

 

$

120

   

$

375

   

$

649

   

$

1,432

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 8% of the average value of its portfolio.

Portfolio Turnover, Rate 8.00%
MULTI-STRATEGY ALTERNATIVE FUND - Class F Prospectus | SIMT Multi-Strategy Alternative Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

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.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Because the Fund incurred AFFE during the most recent fiscal year, the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus), which does not take into account the indirect costs of investing in other investment companies.
Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

       

1.50

%

 

Distribution (12b-1) Fees

       

None

   

Other Expenses

 

Dividends on Shorts

   

0.59

%

     

Remainder of Other Expenses

   

0.60

%

     

Total Other Expenses

 

   

1.19

%

 

Acquired Fund Fees and Expenses (AFFE)

 

   

0.24

%

 

Total Annual Fund Operating Expenses

 

   

2.93

%

 

​ Because the Fund incurred AFFE during the most recent fiscal year, the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus), which does not take into account the indirect costs of investing in other investment companies.

Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Multi-Strategy Alternative Fund — Class F Shares

 

$

296

   

$

907

   

$

1,543

   

$

3,252

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 358% of the average value of its portfolio.

Portfolio Turnover, Rate 358.00%
LARGE CAP FUND - Class I Prospectus | SIMT Large Cap Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.39

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.84

%

 

Total Annual Fund Operating Expenses

   

1.23

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Large Cap Fund — Class I Shares

 

$

125

   

$

390

   

$

676

   

$

1,489

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 42% of the average value of its portfolio.

Portfolio Turnover, Rate 42.00%
LARGE CAP VALUE FUND - Class I Prospectus | SIMT LARGE CAP VALUE FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.35

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.84

%

 

Total Annual Fund Operating Expenses

   

1.19

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Large Cap Value Fund — Class I Shares

 

$

121

   

$

378

   

$

654

   

$

1,443

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 28% of the average value of its portfolio.

Portfolio Turnover, Rate 28.00%
LARGE CAP GROWTH FUND - Class I Prospectus | SIMT LARGE CAP GROWTH FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.40

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.83

%

 

Total Annual Fund Operating Expenses

   

1.23

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Large Cap Growth Fund — Class I Shares

 

$

125

   

$

390

   

$

676

   

$

1,489

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 63% of the average value of its portfolio.

Portfolio Turnover, Rate 63.00%
S&P 500 Index Fund - Class I Prospectus | SIMT S&P 500 Index Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.03

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.76

%

 

Total Annual Fund Operating Expenses

   

0.79

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

S&P 500 Index Fund — Class I Shares

 

$

81

   

$

252

   

$

439

   

$

978

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 3% of the average value of its portfolio.

Portfolio Turnover, Rate 3.00%
SMALL CAP FUND - Class I Prospectus | SIMT Small Cap Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.83

%

 

Total Annual Fund Operating Expenses

   

1.48

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Small Cap Fund — Class I Shares

 

$

151

   

$

468

   

$

808

   

$

1,768

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 80% of the average value of its portfolio.

Portfolio Turnover, Rate 80.00%
SMALL CAP VALUE FUND - Class I Prospectus | SIMT SMALL CAP VALUE FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.84

%

 

Total Annual Fund Operating Expenses

   

1.49

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Small Cap Value Fund — Class I Shares

 

$

152

   

$

471

   

$

813

   

$

1,779

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 48% of the average value of its portfolio.

Portfolio Turnover, Rate 48.00%
SMALL CAP GROWTH FUND - Class I Prospectus | SIMT SMALL CAP GROWTH FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.84

%

 

Total Annual Fund Operating Expenses

   

1.49

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Small Cap Growth Fund — Class I Shares

 

$

152

   

$

471

   

$

813

   

$

1,779

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 155% of the average value of its portfolio.

Portfolio Turnover, Rate 155.00%
MID-CAP FUND - Class I Prospectus | SIMT MID CAP FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.40

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.84

%

 

Total Annual Fund Operating Expenses

   

1.24

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Mid-Cap Fund — Class I Shares

 

$

126

   

$

393

   

$

681

   

$

1,500

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 62% of the average value of its portfolio.

Portfolio Turnover, Rate 62.00%
U.S. MANAGED VOLATILITY FUND - Class I Prospectus | SIMT US MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.55

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.84

%

 

Total Annual Fund Operating Expenses

   

1.39

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

U.S. Managed Volatility Fund — Class I Shares

 

$

142

   

$

440

   

$

761

   

$

1,669

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 68.00%
GLOBAL MANAGED VOLATILITY FUND - Class I Prospectus | SIMT GLOBAL MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.84

%

 

Total Annual Fund Operating Expenses

   

1.49

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Global Managed Volatility Fund — Class I Shares

 

$

152

   

$

471

   

$

813

   

$

1,779

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 78% of the average value of its portfolio.

Portfolio Turnover, Rate 78.00%
REAL ESTATE FUND - Class I Prospectus | SIMT REAL ESTATE FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.84

%

 

Total Annual Fund Operating Expenses

   

1.49

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Real Estate Fund — Class I Shares

 

$

152

   

$

471

   

$

813

   

$

1,779

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 72% of the average value of its portfolio.

Portfolio Turnover, Rate 72.00%
CORE FIXED INCOME FUND - Class I Prospectus | SIMT CORE FIXED INCOME FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.28

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.71

%

 

Total Annual Fund Operating Expenses

   

0.99

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Core Fixed Income Fund — Class I Shares

 

$

101

   

$

315

   

$

547

   

$

1,213

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 394% of the average value of its portfolio.

Portfolio Turnover, Rate 394.00%
HIGH YIELD BOND FUND - Class I Prospectus | SIMT HIGH YIELD BOND FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.49

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.81

%

 

Total Annual Fund Operating Expenses

   

1.30

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

High Yield Bond Fund — Class I Shares

 

$

132

   

$

412

   

$

713

   

$

1,568

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 66% of the average value of its portfolio.

Portfolio Turnover, Rate 66.00%
REAL RETURN FUND - Class I Prospectus | SIMT Real Return Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class I Shares

 

Management Fees

   

0.22

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.73

%

 

Total Annual Fund Operating Expenses

   

0.95

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Real Return Fund — Class I Shares

 

$

97

   

$

303

   

$

525

   

$

1,166

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 29% of the average value of its portfolio.

Portfolio Turnover, Rate 29.00%
LARGE CAP FUND - Class Y Prospectus | SIMT Large Cap Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.39

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.34

%

 

Total Annual Fund Operating Expenses

   

0.73

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Large Cap Fund — Class Y Shares

 

$

75

   

$

233

   

$

406

   

$

906

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 42% of the average value of its portfolio.

Portfolio Turnover, Rate 42.00%
LARGE CAP VALUE FUND - Class Y Prospectus | SIMT LARGE CAP VALUE FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.35

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.34

%

 

Total Annual Fund Operating Expenses

   

0.69

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Large Cap Value Fund — Class Y Shares

 

$

70

   

$

221

   

$

384

   

$

859

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 28% of the average value of its portfolio.

Portfolio Turnover, Rate 28.00%
LARGE CAP GROWTH FUND - Class Y Prospectus | SIMT LARGE CAP GROWTH FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.40

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.33

%

 

Total Annual Fund Operating Expenses

   

0.73

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Large Cap Growth Fund — Class Y Shares

 

$

75

   

$

233

   

$

406

   

$

906

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 63% of the average value of its portfolio.

Portfolio Turnover, Rate 63.00%
TAX-MANAGED LARGE CAP FUND - Class Y Prospectus | SIMT TAX-MANAGED LARGE CAP FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.40

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.26

%

 

Total Annual Fund Operating Expenses

   

0.66

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Tax-Managed Large Cap Fund — Class Y Shares

 

$

67

   

$

211

   

$

368

   

$

822

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 14% of the average value of its portfolio.

Portfolio Turnover, Rate 14.00%
SMALL CAP FUND - Class Y Prospectus | SIMT Small Cap Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.33

%

 

Total Annual Fund Operating Expenses

   

0.98

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Small Cap Fund — Class Y Shares

 

$

100

   

$

312

   

$

542

   

$

1,201

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 80% of the average value of its portfolio.

Portfolio Turnover, Rate 80.00%
SMALL CAP VALUE FUND - Class Y Prospectus | SIMT SMALL CAP VALUE FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.34

%

 

Total Annual Fund Operating Expenses

   

0.99

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Small Cap Value Fund — Class Y Shares

 

$

101

   

$

315

   

$

547

   

$

1,213

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 48% of the average value of its portfolio.

Portfolio Turnover, Rate 48.00%
SMALL CAP GROWTH FUND - Class Y Prospectus | SIMT SMALL CAP GROWTH FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.34

%

 

Total Annual Fund Operating Expenses

   

0.99

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Small Cap Growth Fund — Class Y Shares

 

$

101

   

$

315

   

$

547

   

$

1,213

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 155% of the average value of its portfolio.

Portfolio Turnover, Rate 155.00%
TAX-MANAGED SMALL/MID CAP FUND - Class Y Prospectus | SIMT TAX-MANAGED SMALL/MID CAP FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.34

%

 

Total Annual Fund Operating Expenses

   

0.99

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Tax-Managed Small/Mid Cap Fund — Class Y Shares

 

$

101

   

$

315

   

$

547

   

$

1,213

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 36% of the average value of its portfolio.

Portfolio Turnover, Rate 36.00%
MID-CAP FUND - Class Y Prospectus | SIMT MID CAP FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.40

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.34

%

 

Total Annual Fund Operating Expenses

   

0.74

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Mid-Cap Fund — Class Y Shares

 

$

76

   

$

237

   

$

411

   

$

918

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 62% of the average value of its portfolio.

Portfolio Turnover, Rate 62.00%
U.S. MANAGED VOLATILITY FUND - Class Y Prospectus | SIMT US MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.55

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.34

%

 

Total Annual Fund Operating Expenses

   

0.89

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

U.S. Managed Volatility Fund — Class Y Shares

 

$

91

   

$

284

   

$

493

   

$

1,096

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 68.00%
GLOBAL MANAGED VOLATILITY FUND - Class Y Prospectus | SIMT GLOBAL MANAGED VOLATILITY FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.34

%

 

Total Annual Fund Operating Expenses

   

0.99

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Global Managed Volatility Fund — Class Y Shares

 

$

101

   

$

315

   

$

547

   

$

1,213

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 78% of the average value of its portfolio.

Portfolio Turnover, Rate 78.00%
TAX-MANAGED MANAGED VOLATILITY FUND - Class Y Prospectus | SIMT Tax-Managed Managed Volatility Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.55

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.34

%

 

Total Annual Fund Operating Expenses

   

0.89

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs and may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Tax-Managed Managed Volatility Fund — Class Y Shares

 

$

91

   

$

284

   

$

493

   

$

1,096

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 43% of the average value of its portfolio.

Portfolio Turnover, Rate 43.00%
TAX-MANAGED INTERNATIONAL MANAGED VOLATILITY FUND - Class Y Prospectus | SIMT Tax-Managed International Managed Volatility Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.48

%

 

Total Annual Fund Operating Expenses

   

1.13

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Tax-Managed International Managed Volatility Fund — Class Y Shares

 

$

115

   

$

359

   

$

622

   

$

1,375

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 66% of the average value of its portfolio.

Portfolio Turnover, Rate 66.00%
REAL ESTATE FUND - Class Y Prospectus | SIMT REAL ESTATE FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.65

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.34

%

 

Total Annual Fund Operating Expenses

   

0.99

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Real Estate Fund — Class Y Shares

 

$

101

   

$

315

   

$

547

   

$

1,213

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 72% of the average value of its portfolio.

Portfolio Turnover, Rate 72.00%
CORE FIXED INCOME FUND - Class Y Prospectus | SIMT CORE FIXED INCOME FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.28

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.21

%

 

Total Annual Fund Operating Expenses

   

0.49

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Core Fixed Income Fund — Class Y Shares

 

$

50

   

$

157

   

$

274

   

$

616

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 394% of the average value of its portfolio.

Portfolio Turnover, Rate 394.00%
HIGH YIELD BOND FUND - Class Y Prospectus | SIMT HIGH YIELD BOND FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.49

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.25

%

 

Total Annual Fund Operating Expenses

   

0.74

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

High Yield Bond Fund — Class Y Shares

 

$

76

   

$

237

   

$

411

   

$

918

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 66% of the average value of its portfolio.

Portfolio Turnover, Rate 66.00%
CONSERVATIVE INCOME FUND - Class Y Prospectus | SIMT Conservative Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.10

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.24

%

 

Total Annual Fund Operating Expenses

   

0.34

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Conservative Income Fund — Class Y Shares

 

$

35

   

$

109

   

$

191

   

$

431

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 0% of the average value of its portfolio.

Portfolio Turnover, Rate none
TAX-FREE CONSERVATIVE INCOME FUND - Class Y Prospectus | SIMT Tax-Free Conservative Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.10

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.24

%

 

Total Annual Fund Operating Expenses

   

0.34

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Tax-Free Conservative Income Fund — Class Y Shares

 

$

35

   

$

109

   

$

191

   

$

431

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 0% of the average value of its portfolio.

Portfolio Turnover, Rate none
REAL RETURN FUND - Class Y Prospectus | SIMT Real Return Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.22

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.23

%

 

Total Annual Fund Operating Expenses

   

0.45

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Real Return Fund — Class Y Shares

 

$

46

   

$

144

   

$

252

   

$

567

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 29% of the average value of its portfolio.

Portfolio Turnover, Rate 29.00%
DYNAMIC ASSET ALLOCATION FUND - Class Y Prospectus | SIMT Dynamic Asset Allocation Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees (of the Fund and Subsidiary)

             

Management of the Fund

   

0.60

%

         

Management of the Subsidiary

   

None

           

Total Management Fees

       

0.60

%

 

Distribution (12b-1) Fees

       

None

   

Other Expenses (of the Fund and Subsidiary)

             

Other Expenses of the Fund

   

0.33

%

         

Other Expenses of the Subsidiary

   

None

           

Total Other Expenses

       

0.33

%

 

Total Annual Fund Operating Expenses

       

0.93

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Dynamic Asset Allocation Fund — Class Y Shares

 

$

95

   

$

296

   

$

515

   

$

1,143

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 8% of the average value of its portfolio.

Portfolio Turnover, Rate 8.00%
MULTI-STRATEGY ALTERNATIVE FUND - Class Y Prospectus | SIMT Multi-Strategy Alternative Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

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.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Because the Fund incurred AFFE during the most recent fiscal year, the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus), which does not take into account the indirect costs of investing in other investment companies.
Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

       

1.50

%

 

Distribution (12b-1) Fees

       

None

   

Other Expenses

             

Dividends on Shorts

   

0.59

%

         

Remainder of Other Expenses

   

0.35

%

         

Total Other Expenses

 

   

0.94

%

 

Acquired Fund Fees and Expenses (AFFE)

 

   

0.24

%

 

Total Annual Fund Operating Expenses

 

   

2.68

%

 

​ Because the Fund incurred AFFE during the most recent fiscal year, the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus), which does not take into account the indirect costs of investing in other investment companies.

Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Multi-Strategy Alternative Fund — Class Y Shares

 

$

271

   

$

832

   

$

1,420

   

$

3,012

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

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 358% of the average value of its portfolio.

Portfolio Turnover, Rate 358.00%
MULTI-ASSET ACCUMULATION FUND - Class F Prospectus | SIMT MULTI-ASSET ACCUMULATION FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees (of the Fund and Subsidiary)

             

Management Fees of the Fund

   

0.75

%

         

Management Fees of the Subsidiary

   

None

           

Total Management Fees

       

0.75

%

 

Distribution (12b-1) Fees

       

None

   

Other Expenses (of the Fund and Subsidiary)

             

Other Expenses of the Fund

   

0.59

%

         

Other Expenses of the Subsidiary

   

None

           

Total Other Expenses

 

   

0.59

%

 

Total Annual Fund Operating Expenses

 

   

1.34

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Multi-Asset Accumulation Fund — Class F Shares

 

$

136

   

$

425

   

$

734

   

$

1,613

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund will pay 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 75% of the average value of its portfolio.

Portfolio Turnover, Rate 75.00%
MULTI-ASSET INCOME FUND - Class F Prospectus | SIMT MULTI-ASSET INCOME FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.60

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.61

%

 

Total Annual Fund Operating Expenses

   

1.21

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Multi-Asset Income Fund — Class F Shares

 

$

123

   

$

384

   

$

665

   

$

1,466

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund will pay 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 59% of the average value of its portfolio.

Portfolio Turnover, Rate 59.00%
MULTI-ASSET INFLATION MANAGED FUND - Class F Prospectus | SIMT MULTI-ASSET INFLATION MANAGED FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees (of the Fund and Subsidiary)

             

Management Fees of the Fund

       

0.55

%

     

Management Fees of the Subsidiary

       

None

           

Total Management Fees

           

0.55

%

 

Distribution (12b-1) Fees

           

None

   

Other Expenses (of the Fund and Subsidiary)

             

Other Expenses of the Fund

             

Dividends on Shorts

   

0.11

%

         

Interest Expense on Reverse Repurchase Agreements

   

0.03

%

         

Remainder of Other Expenses

   

0.60

%

         

Total Other Expenses of the Fund

 

   

0.74

%

     

Other Expenses of the Subsidiary

       

None

       

Total Other Expenses

     

   

0.74

%

 

Total Annual Fund Operating Expenses

     

   

1.29

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Multi-Asset Inflation Managed Fund — Class F Shares

 

$

131

   

$

409

   

$

708

   

$

1,556

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund will pay 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 44% of the average value of its portfolio.

Portfolio Turnover, Rate 44.00%
MULTI-ASSET CAPITAL STABILITY FUND - Class F Prospectus | SIMT MULTI-ASSET CAPITAL STABILITY FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class F Shares

 

Management Fees

   

0.40

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.58

%

 

Total Annual Fund Operating Expenses

   

0.98

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Multi-Asset Capital Stability Fund — Class F Shares

 

$

100

   

$

312

   

$

542

   

$

1,201

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund will pay 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 260% of the average value of its portfolio.

Portfolio Turnover, Rate 260.00%
MULTI-ASSET ACCUMULATION FUND - Class Y Prospectus | SIMT MULTI-ASSET ACCUMULATION FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees (of the Fund and Subsidiary)

         

Management Fees of the Fund

   

0.75

%

     

Management Fees of the Subsidiary

   

None

       

Total Management Fees

       

0.75

%

 

Distribution (12b-1) Fees

       

None

   

Other Expenses (of the Fund and Subsidiary)

         

Other Expenses of the Fund

   

0.34

%

     

Other Expenses of the Subsidiary

   

None

       

Total Other Expenses

 

   

0.34

%

 

Total Annual Fund Operating Expenses

 

   

1.09

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Multi-Asset Accumulation Fund — Class Y Shares

 

$

111

   

$

347

   

$

601

   

$

1,329

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund will pay 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 75% of the average value of its portfolio.

Portfolio Turnover, Rate 75.00%
MULTI-ASSET INCOME FUND - Class Y Prospectus | SIMT MULTI-ASSET INCOME FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.60

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.36

%

 

Total Annual Fund Operating Expenses

   

0.96

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Multi-Asset Income Fund — Class Y Shares

 

$

98

   

$

306

   

$

531

   

$

1,178

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund will pay 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 59% of the average value of its portfolio.

Portfolio Turnover, Rate 59.00%
MULTI-ASSET INFLATION MANAGED FUND - Class Y Prospectus | SIMT MULTI-ASSET INFLATION MANAGED FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees (of the Fund and Subsidiary)

             

Management Fees of the Fund

       

0.55

%

     

Management Fees of the Subsidiary

       

None

       

Total Management Fees

           

0.55

%

 

Distribution (12b-1) Fees

           

None

   

Other Expenses (of the Fund and Subsidiary)

         

Other Expenses of the Fund

         

Dividends on Shorts

   

0.11

%

         

Interest Expense on Reverse Repurchase Agreements

   

0.03

%

         

Remainder of Other Expenses

   

0.35

%

         

Total Other Expenses of the Fund

 

   

0.49

%

     

Other Expenses of the Subsidiary

       

None

       

Total Other Expenses

     

   

0.49

%

 

Total Annual Fund Operating Expenses

     

   

1.04

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Multi-Asset Inflation Managed Fund — Class Y Shares

 

$

106

   

$

331

   

$

574

   

$

1,271

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund will pay 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 44% of the average value of its portfolio.

Portfolio Turnover, Rate 44.00%
MULTI-ASSET CAPITAL STABILITY FUND - Class Y Prospectus | SIMT MULTI-ASSET CAPITAL STABILITY FUND  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

Operating Expenses Caption [Optional Text] ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

(expenses that you pay each year as a percentage of the value of your investment)

 

Class Y Shares

 

Management Fees

   

0.40

%

 

Distribution (12b-1) Fees

   

None

   

Other Expenses

   

0.33

%

 

Total Annual Fund Operating Expenses

   

0.73

%

 
Expense Example [Heading] EXAMPLE
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem or hold all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Expense Example by, Year, Caption [Text] Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
   

1 Year

 

3 Years

 

5 Years

 

10 Years

 

Multi-Asset Capital Stability Fund — Class Y Shares

 

$

75

   

$

233

   

$

406

   

$

906

   
Portfolio Turnover [Heading] PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]

The Fund will pay 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 260% of the average value of its portfolio.

Portfolio Turnover, Rate 260.00%