Prospectus: Document [Axis] Prospectus Performance Measure [Axis] Performance Measure Series [Axis] Series Share Class [Axis] Share Classes Risk/Return: Document Type Document Period End Date Registrant Name Central Index Key Amendment Flag Document Creation Date Document Effective Date Prospectus Date Risk/Return [Heading] Objective [Heading] Objective, Primary [Text Block] Expense [Heading] Expense Narrative [Text Block] Operating Expenses: Management Fees (as a percentage of Assets) Management Fees Distribution and Service (12b-1) Fees Distribution and Service (12b-1) Fees Other Expenses (as a percentage of Assets): Other Expenses Expenses (as a percentage of Assets) Total Annual Fund Operating Expenses Total Annual Fund Operating Expenses Fee Waiver or Reimbursement Expense Limitation Fee Waiver and Expense Limitation Net Expenses (as a percentage of Assets) Total Annual Fund Operating Expenses After Total Annual Fund Operating Expenses After Fee Waiver or Reimbursement over Assets, Date of Termination Expense Example: Expense Example [Heading] Expense Example Narrative [Text Block] Expense Example, By Year, Column [Text] Expense Example, with Redemption, 1 Year 1 Year Expense Example, with Redemption, 3 Years 3 Years Expense Example, with Redemption, 5 Years 5 Years Expense Example, with Redemption, 10 Years 10 Years Portfolio Turnover [Heading] Portfolio Turnover [Text Block] Portfolio Turnover, Rate Strategy [Heading] Strategy Narrative [Text Block] Risk [Heading] Risk Narrative [Text Block] Risk Lose Money [Text] Risk Not Insured Depository Institution [Text] Bar Chart and Performance Table [Heading] Performance Narrative [Text Block] Performance Information Illustrates Variability of Returns [Text] Performance Past Does Not Indicate Future [Text] Performance Table Closing [Text Block] Performance Availability Website Address [Text] Bar Chart Table: Bar Chart [Heading] Annual Return 2002 2002 Annual Return 2003 2003 Annual Return 2004 2004 Annual Return 2005 2005 Annual Return 2006 2006 Annual Return 2007 2007 Annual Return 2008 2008 Annual Return 2009 2009 Annual Return 2010 2010 Annual Return 2011 2011 Bar Chart Closing [Text Block] Highest Quarterly Return, Label Highest Quarterly Return, Date Highest Quarterly Return Lowest Quarterly Return, Label Lowest Quarterly Return, Date Lowest Quarterly Return Average Annual Return: Label Index No Deduction for Fees, Expenses, Taxes [Text] 1 Year 1 Year 10 Years 10 Years Since Inception Inception Date S000009352 Member Goldman Sachs Structured U.S. Equity Fund. Goldman Sachs Structured U.S. Equity Fund S000009353 Member Goldman Sachs Core Fixed Income Fund. Goldman Sachs Core Fixed Income Fund S000009354 Member Goldman Sachs Money Market Fund. Goldman Sachs Money Market Fund S000009355 Member Goldman Sachs Structured Small Cap Equity Fund. Goldman Sachs Structured Small Cap Equity Fund S000009356 Member Goldman Sachs Strategic Growth Fund. Goldman Sachs Strategic Growth Fund S000009357 Member Goldman Sachs Large Cap Value Fund. Goldman Sachs Large Cap Value Fund S000009358 Member Goldman Sachs Mid Cap Value Fund Goldman Sachs Mid Cap Value Fund S000009359 Member Goldman Sachs Strategic International Equity Fund Goldman Sachs Strategic International Equity Fund. S000009360 Member Goldman Sachs Growth Opportunities Fund. Goldman Sachs Growth Opportunities Fund S000009361 Member Goldman Sachs Equity Index Fund. Goldman Sachs Equity Index Fund S000009362 Member Goldman Sachs Government Income Fund. Goldman Sachs Government Income Fund S And P Five Hundred Index Member S&P 500 Index (reflects no deduction for fees, expenses, or taxes) S And P Five Hundred Index. Russell Two Thousand Index Member Russell 2000 Index (reflects no deduction for fees, expenses, or taxes) Russell Two Thousand Index. Russell Thousand Growth Index Member Russell 1000 Growth Index (reflects no deduction for fees, expenses, or taxes) Russell Thousand Growth Index. Russell Thousand Value Index Member Russell 1000 Value Index (reflects no deduction for fees, expenses, or taxes) Russell Thousand Value Index. Russell Midcap Value Index Member Russell Midcap Value Index (reflects no deduction for fees, expenses, or taxes) Russell Midcap Value Index. Russell Midcap Growth Index Member Russell Midcap Growth Index (reflects no deduction for fees, expenses, or taxes) Russell Midcap Growth Index. Msci Eafe Net Index Unhedged Member MSCI EAFE (net) Index (unhedged) (reflects no deduction for fees or expenses) Msci Eafe Net Index Unhedged. Barclays Capital U S Aggregate Bond Index Member Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) Barclays Capital U.S. Aggregate Bond Index. C000025633 Member Goldman Sachs Structured U.S. Equity Fund, Institutional. Institutional Shares C000025634 Member Goldman Sachs Structured U.S. Equity Fund, Service. Service Shares C000025640 Member Goldman Sachs Structured Small Cap Equity Fund, Institutional. Institutional Shares C000025641 Member Goldman Sachs Structured Small Cap Equity Fund, Service. Service Shares C000025643 Member Goldman Sachs Strategic Growth Fund, Institutional. Institutional Shares C000025644 Member Goldman Sachs Strategic Growth Fund, Service. Service Shares C000025646 Member Goldman Sachs Large Cap Value Fund, Institutional. Institutional Shares C000025647 Member Goldman Sachs Large Cap Value Fund, Service. Service Shares C000025649 Member Goldman Sachs Mid Cap Value Fund, Institutional. Institutional Shares C000025650 Member Goldman Sachs Mid Cap Value Fund, Service. Service Shares C000025657 Member Goldman Sachs Equity Index Fund, Service. Service Shares C000025652 Member Goldman Sachs Strategic International Equity Fund, Institutional. Institutional Shares C000025653 Member Goldman Sachs Strategic International Equity Fund, Service. Service Shares C000025659 Member Goldman Sachs Government Income Fund, Service. Service Shares C000025636 Member Goldman Sachs Core Fixed Income Fund, Service. Service Shares C000025638 Member Goldman Sachs Money Market Fund, Service. Service Shares Prospectus One Member Prospectus One Member. Institutional Shares Prospectus Two Member Prospectus Two Member. Service Shares Operating Expenses Caption [Text] Annual Fund Operating Expenses [Table] Expense Example, With Redemption [Table] Bar Chart [Table] Performance [Table] C000025655 Member Service Shares Acquired Fund Fees And Expenses Over Assets Acquired Fund Fees and Expenses Barclays Capital Government Mortgage Index Member Barclays Capital Government/Mortgage Index (reflects no deduction for fees, expenses, or taxes) Expenses Restated To Reflect Current Expenses Not Correlated To Ratio Due To Acquired Fund Fees Risk Money Market Fund 5 Years 5 Year 5 Years Performance Table Heading