Investment Objectives and Goals
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Sep. 28, 2026 |
| LARGE CAP FUND | SIIT LARGE CAP FUND |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
LARGE CAP FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Long-term growth of capital and income.
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| LARGE CAP DISCIPLINED EQUITY FUND | SIIT LARGE CAP DISCIPLINED EQUITY FUND |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
LARGE CAP DISCIPLINED EQUITY FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Capital appreciation.
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| LARGE CAP INDEX FUND | SIIT LARGE CAP INDEX FUND |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
LARGE CAP INDEX FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Investment results that correspond to the aggregate price and dividend performance of the securities in the Russell 1000 Index.
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| S&P 500 INDEX FUND | SIIT S&P 500 Index Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
S&P 500 INDEX FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Investment results that correspond to the aggregate price and dividend performance of the securities in the S&P 500 Index.
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| EXTENDED MARKET INDEX FUND | SIIT Extended Market Index Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
EXTENDED MARKET INDEX FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Seeks investment results that approximate, as closely as practicable and before expenses, the performance of the Russell Small Cap Completeness Index.
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| SMALL CAP FUND | SIIT SMALL CAP FUND |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
SMALL CAP FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Capital appreciation.
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| SMALL CAP II FUND | SIIT Small Cap II Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
SMALL CAP II FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Capital appreciation.
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| SMALL/MID CAP EQUITY FUND | SIIT SMALL MID CAP EQUITY FUND |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
SMALL/MID CAP EQUITY FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Long-term capital appreciation.
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| U.S. EQUITY FACTOR ALLOCATION FUND | SIIT U.S. Equity Factor Allocation Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
U.S. EQUITY FACTOR ALLOCATION FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Long-term growth of capital and income.
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| U.S. MANAGED VOLATILITY FUND | SIIT U.S. Managed Volatility Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
U.S. MANAGED VOLATILITY FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Capital appreciation with less volatility than the broad U.S. equity markets.
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| GLOBAL MANAGED VOLATILITY FUND | SIIT Global Managed Volatility Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
GLOBAL MANAGED VOLATILITY FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Capital appreciation with less volatility than the broad global equity markets.
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| WORLD EQUITY EX-US FUND | SIIT WORLD EQUITY EX-US FUND |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
WORLD EQUITY EX-US FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Capital appreciation.
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| SCREENED WORLD EQUITY EX-US FUND | SIIT Screened World Equity Ex-US Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
SCREENED WORLD EQUITY EX-US FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Capital appreciation.
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| EMERGING MARKETS EQUITY FUND | SIIT EMERGING MARKETS EQUITY FUND |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
EMERGING MARKETS EQUITY FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Capital appreciation.
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| OPPORTUNISTIC INCOME FUND | SIIT Opportunistic Income Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
OPPORTUNISTIC INCOME FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Capital appreciation and income.
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| CORE FIXED INCOME FUND | SIIT CORE FIXED INCOME |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
CORE FIXED INCOME FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Current income consistent with the preservation of capital.
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| HIGH YIELD BOND FUND | SIIT HIGH YIELD BOND FUND |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
HIGH YIELD BOND FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Total return.
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| LONG DURATION FUND | SIIT LONG DURATION FUND |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
LONG DURATION FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Return characteristics similar to those of high quality bonds.
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| LONG DURATION CREDIT FUND | SIIT Long Duration Credit Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
LONG DURATION CREDIT FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Return characteristics similar to those of high quality bonds.
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| ULTRA SHORT DURATION BOND FUND | SIIT Ultra Short Duration Bond Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
ULTRA SHORT DURATION BOND FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Provide higher current income than that typically offered by a money market fund while maintaining a high degree of liquidity and a correspondingly higher risk of principal volatility.
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| EMERGING MARKETS DEBT FUND | SIIT EMERGING MARKETS DEBT FUND |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
EMERGING MARKETS DEBT FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Maximize total return.
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| REAL RETURN FUND | SIIT Real Return Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
REAL RETURN FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Total return exceeding the rate of inflation.
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| LIMITED DURATION BOND FUND | SIIT Limited Duration Bond Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
LIMITED DURATION BOND FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Preservation of capital and current income.
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| INTERMEDIATE DURATION CREDIT FUND | SIIT Intermediate Duration Credit Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
INTERMEDIATE DURATION CREDIT FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Current income consistent with the preservation of capital.
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| DYNAMIC ASSET ALLOCATION FUND | SIIT Dynamic Asset Allocation Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
DYNAMIC ASSET ALLOCATION FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Long-term total return.
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| MULTI-ASSET REAL RETURN FUND | SIIT Multi-Asset Real Return Fund |
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| Prospectus [Line Items] |
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| Risk/Return [Heading] |
MULTI-ASSET REAL RETURN FUND
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| Objective [Heading] |
Investment Goal
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| Objective, Primary [Text Block] |
Total return exceeding the rate of inflation.
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