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Investor Class Shares | SA U.S. Core Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading SA U.S. Core Market Fund
Investment Objective, Heading rr_ObjectiveHeading Goal
Investment Objective, Primary rr_ObjectivePrimaryTextBlock

The Fund’s goal is to achieve long-term capital appreciation.
Expense, Heading rr_ExpenseHeading Fees and Expenses
Expense, Narrative rr_ExpenseNarrativeTextBlock

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.
Shareholder Fees, Caption rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses, Caption rr_OperatingExpensesCaption Annual Class Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Investor Class 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 rr_PortfolioTurnoverRate 4.00%
Expense Example, Heading rr_ExpenseExampleHeading Expense Example
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

This expense example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Investment Strategy, Heading rr_StrategyHeading Principal Investment Strategies
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock

The Fund pursues its goal by generally investing in a broad and diverse group of readily marketable equity securities listed on a securities exchange in the United States that is deemed appropriate by Dimensional Fund Advisors LP (the “Sub-Adviser”). The Sub-Adviser limits the universe of eligible securities in which the Fund may invest to those of companies whose market capitalizations generally are either in the highest 96% of total market capitalization or companies whose market capitalizations are larger than the 1,500th largest U.S. company, whichever results in the higher market capitalization threshold. Under the Sub-Adviser’s market capitalization guidelines described above, based on market capitalization data as of August 31, 2019, the market capitalization of an eligible company would be approximately $2.3 billion or above. This dollar amount will vary due to market conditions. The Fund has a non-fundamental investment policy that, under normal circumstances, it will invest at least 80% of its net assets in U.S. securities.

The Sub-Adviser uses a market capitalization weighted approach to weight the securities in the Fund’s portfolio. In general, this means that the higher the relative market capitalization of the issuer, the greater its representation in the Fund. The Sub-Adviser may, in its discretion, adjust the representation in the Fund of an eligible company, or exclude an eligible company, after considering such factors as free float (a company’s share capital that is freely available for trading), profitability, trading strategies, liquidity, size, value, momentum, investment characteristics and other factors that it determines to be appropriate. In assessing profitability, the Sub-Adviser may consider different ratios, such as earnings or profits from operations relative to book value or assets. In assessing a company’s investment characteristics, the Sub-Adviser may consider ratios such as recent changes in assets or book value scaled by assets or book value. The criteria the Sub-Adviser uses for assessing value, profitability or investment characteristics are subject to change from time to time.

The Fund may also invest up to 5% of its total assets in the U.S. Micro Cap Portfolio, a portfolio of DFA Investment Dimensions Group Inc., a separate registered investment company. The Sub-Adviser is also the adviser of the U.S. Micro Cap Portfolio. The U.S. Micro Cap Portfolio generally will purchase a broad and diverse group of securities of micro cap companies listed on a securities exchange in the United States that is deemed appropriate by the Sub-Adviser.

The Fund may lend its portfolio securities to generate additional income.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration The Fund pursues its goal by generally investing in a broad and diverse group of readily marketable equity securities listed on a securities exchange in the United States that is deemed appropriate by Dimensional Fund Advisors LP (the “Sub-Adviser”). The Sub-Adviser limits the universe of eligible securities in which the Fund may invest to those of companies whose market capitalizations generally are either in the highest 96% of total market capitalization or companies whose market capitalizations are larger than the 1,500th largest U.S. company, whichever results in the higher market capitalization threshold. Under the Sub-Adviser’s market capitalization guidelines described above, based on market capitalization data as of August 31, 2019, the market capitalization of an eligible company would be approximately $2.3 billion or above. This dollar amount will vary due to market conditions. The Fund has a non-fundamental investment policy that, under normal circumstances, it will invest at least 80% of its net assets in U.S. securities.
Risk, Heading rr_RiskHeading Principal Investment Risks
Risk, Narrative rr_RiskNarrativeTextBlock

The share price of the Fund may change daily based on market conditions and other factors. Therefore, you may lose money if you invest in the Fund.

The principal risks that apply to the Fund are:

● Market Risk: The value of securities may go up or down in response to the prospects of individual issuers, general economic or market conditions, and/or investor behavior that leads investors’ perceptions of value (as reflected in the price of the security) to diverge from fundamental value.
   
● Large Company Stock Risk: Larger, more established companies may be unable to respond quickly to competitive challenges, such as changes in technology and consumer tastes.
   
● Medium-Size Company Stock Risk: Stocks of medium-size companies are usually more sensitive to adverse business developments and economic, political, regulatory and market factors than stocks of larger companies, and the prices of stocks of medium-size companies may be more volatile.
   
● Small Company Stock Risk: The stocks of small companies may involve more risk than those of larger companies. Small companies often have narrower markets and more limited managerial and financial resources than larger, more established companies. As a result, they may be more sensitive to changing economic conditions, which could increase the volatility of their share prices. In addition, small company stocks typically are traded in lower volume, making them more difficult to purchase or sell at the desired time and price or in the desired amount. Generally, the smaller the company size, the greater these risks.
   
● Securities Lending Risk: Securities lending involves possible delay in recovery of the securities or possible loss of rights in the collateral should the borrower fail financially. As a result, the value of the Fund shares may fall. The value of the Fund shares could also fall if a loan is called and the Fund is required to liquidate reinvested collateral at a loss or if the Fund is unable to reinvest cash collateral at rates which exceed the costs involved.
   
● Sector Risk: Companies with similar characteristics may be grouped together in broad categories called sectors. The Fund may be overweight in certain sectors at various times. To the extent the Fund invests more heavily in a particular sector, its performance will be especially sensitive to any economic, business, regulatory or other developments which generally affect that sector. Individual sectors may underperform other sectors or the market as a whole.
   
● Cybersecurity Risk: Cybersecurity breaches may allow an unauthorized party to gain access to Fund assets, customer data, or proprietary information, or cause the Fund and/or its service providers to suffer data corruption or lose operational functionality. Cyber-attacks affecting the Fund, any of its service providers or any issuer in which the Fund invests may adversely impact the Fund.
   
● Management Risk: The investment techniques and risk analyses applied by the Sub-Adviser may not produce the desired results. Furthermore, legislative, regulatory, or tax restrictions, policies, or developments may affect the investment techniques available to the Sub-Adviser in connection with managing the Fund. There is no guarantee that the investment objective of the Fund will be achieved.
   
● Large Investor Risk. Ownership of shares of the Fund may be concentrated in one or a few large investors. Such investors may redeem shares in large quantities or on a frequent basis. Redemptions by a large investor may: affect the performance of the Fund; increase realized capital gains; accelerate the realization of taxable income to shareholders; and increase transaction costs and/or other expenses for the Fund.
   
● Profitability Investment Risk: High relative profitability stocks may perform differently from the market as a whole and following a profitability-oriented strategy may cause the Portfolio to at times underperform equity funds that use other investment strategies.
Risk, Lose Money rr_RiskLoseMoney The share price of the Fund may change daily based on market conditions and other factors. Therefore, you may lose money if you invest in the Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Fund. The bar chart shows how the Fund’s performance has varied from year to year. The table shows how the Fund’s average annual total returns for certain time periods compare to those of a broad-based securities market index. The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. Updated Fund performance information can be obtained by visiting http://www.sa-funds.com.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Fund. The bar chart shows how the Fund’s performance has varied from year to year. The table shows how the Fund’s average annual total returns for certain time periods compare to those of a broad-based securities market index.
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress www.sa-funds.com
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns – Investor Class Shares (per calendar year)
Bar Chart, Closing rr_BarChartClosingTextBlock

The year-to-date return through the calendar quarter ended September 30, 2019 was 19.92%.

Highest/lowest quarterly return during the periods shown:

    Quarter Ended   Total Return
Best Quarter     6/30/2009     15.03%
Worst Quarter     9/30/2011     (15.19)%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 19.92%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.03%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.19%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended December 31, 2018)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In certain situations, the “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than the other return figures for the same period. A higher after-tax return can occur when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
Investor Class Shares | SA U.S. Core Market Fund | Russell 3000 Index  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (5.24%)
5 Years rr_AverageAnnualReturnYear05 7.91%
10 Years rr_AverageAnnualReturnYear10 13.18%
Investor Class Shares | SA U.S. Core Market Fund | SA U.S. Core Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Sales charge (load) imposed on purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Sales charge (load) imposed on reinvested dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption fee rr_RedemptionFee none
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 0.43%
Shareholder servicing fee rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.20%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total annual operating expenses rr_ExpensesOverAssets 0.90%
1 year rr_ExpenseExampleYear01 $ 92
3 years rr_ExpenseExampleYear03 287
5 years rr_ExpenseExampleYear05 499
10 years rr_ExpenseExampleYear10 $ 1,109
Annual Return 2009 rr_AnnualReturn2009 25.57%
Annual Return 2010 rr_AnnualReturn2010 16.04%
Annual Return 2011 rr_AnnualReturn2011 0.42%
Annual Return 2012 rr_AnnualReturn2012 15.19%
Annual Return 2013 rr_AnnualReturn2013 33.38%
Annual Return 2014 rr_AnnualReturn2014 11.19%
Annual Return 2015 rr_AnnualReturn2015 (0.32%)
Annual Return 2016 rr_AnnualReturn2016 11.46%
Annual Return 2017 rr_AnnualReturn2017 22.20%
Annual Return 2018 rr_AnnualReturn2018 (4.60%)
1 Year rr_AverageAnnualReturnYear01 (4.60%)
5 Years rr_AverageAnnualReturnYear05 7.57%
10 Years rr_AverageAnnualReturnYear10 12.47%
Investor Class Shares | SA U.S. Core Market Fund | SA U.S. Core Market Fund | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (6.00%)
5 Years rr_AverageAnnualReturnYear05 6.67%
10 Years rr_AverageAnnualReturnYear10 11.86%
Investor Class Shares | SA U.S. Core Market Fund | SA U.S. Core Market Fund | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (1.75%)
5 Years rr_AverageAnnualReturnYear05 5.91%
10 Years rr_AverageAnnualReturnYear10 10.37%