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R SHARES | U.S. Targeted Value Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading U.S. Targeted Value Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment objective of the U.S. Targeted Value Portfolio (the “Portfolio”) is to achieve long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Portfolio
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses you may pay if you buy, hold or sell shares of the U.S. Targeted Value Portfolio. You may pay other fees or expenses in connection with your defined contribution, health savings and qualified tuition plans/programs, which are not reflected in the table and Example below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund 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 [Text Block] rr_PortfolioTurnoverTextBlock
The U.S. Targeted Value Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These costs, which are not reflected in Annual
  
Fund Operating Expenses or in the Example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 13% of the average value of its investment portfolio. 
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 13.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent The “Management Fee” and “Total Annual Fund Operating Expenses” have been adjusted to reflect the decrease in the management fee payable by the Portfolio from 0.30% to 0.27% effective February 28, 2022.
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is meant to help you compare the cost of investing in the U.S. Targeted Value Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment has a 5% return each year and the operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
 
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
To achieve the U.S. Targeted Value Portfolio’s investment objective, Dimensional Fund Advisors LP (the “Advisor”) implements an integrated investment approach that combines research, portfolio design, portfolio management, and trading functions. As further described below, the Portfolio’s design emphasizes long-term drivers of expected returns identified by the Advisor’s research, while balancing risk through broad diversification across companies and sectors. The Advisor’s portfolio management and trading processes further balance those long-term drivers of expected returns with shorter-term drivers of expected returns and trading costs.
The U.S. Targeted Value Portfolio, using a market capitalization weighted approach, is designed to purchase a broad and diverse group of the readily marketable securities of U.S. small and mid cap companies that the Advisor determines to be value stocks with higher profitability. A company’s market capitalization is the number of its shares outstanding times its price per share. Under a market capitalization weighted approach, companies with higher market capitalizations generally represent a larger proportion of the Portfolio than companies with relatively lower market capitalizations. The Portfolio may emphasize certain stocks, including smaller capitalization companies, lower relative price stocks, and/or higher profitability stocks as compared to their representation in the small- and mid-cap value segment of the U.S. market. An equity issuer is considered to have a low relative price (i.e., a value stock) primarily because it has a low price in relation to its book value. In assessing relative price, the Advisor may consider additional factors such as price to cash flow and price to earnings ratios. An equity issuer is considered to have high profitability because it has high earnings or profits from operations in relation to its book value or assets. The criteria the Advisor uses for assessing relative price and profitability are subject to change from time to time.
As a non‑fundamental policy, under normal circumstances, the U.S. Targeted Value Portfolio will invest at least 80% of its net assets in securities of U.S. companies. As of the date of this Prospectus, the Advisor considers for investment companies whose market capitalization are generally smaller than the 500th largest U.S. company. As of December 31, 2021, companies smaller than the 500th largest U.S. company fall in the lowest 12% of total U.S. market capitalization. Total market capitalization is based on the market capitalization of eligible U.S. operating companies listed on a securities exchange in the United States that is deemed appropriate by the Advisor. Based on market capitalization data as of December 31, 2021, the market capitalization of a company smaller than the 500th largest U.S. company would be below $13,929 million. This threshold will change due to market conditions.
The Advisor may also increase or reduce the U.S. Targeted Value Portfolio’s exposure to an eligible company, or exclude a company, based on shorter-term considerations, such as a company’s price momentum and investment characteristics. In assessing a company’s investment characteristics, the Advisor considers ratios such as recent changes in assets divided by total assets. The criteria the Advisor uses for assessing a company’s investment characteristics are subject to change from time to time. In addition, the Advisor seeks to reduce trading costs using a flexible trading approach that looks for opportunities to participate in the available market liquidity, while managing turnover and explicit transaction costs. 
The U.S. Targeted Value Portfolio may purchase or sell futures contracts and options on futures contracts for U.S. equity securities and indices, to increase or decrease equity market exposure based on actual or expected cash inflows to or outflows from the Portfolio. 
The U.S. Targeted Value Portfolio may lend its portfolio securities to generate additional income. 
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Because the value of your investment in the U.S. Targeted Value Portfolio will fluctuate, there is the risk that you will lose money. An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following is a description of principal risks of investing in the Portfolio.
  
Equity Market Risk: Even a long-term investment approach cannot guarantee a profit. Economic, market, political, and issuer-specific conditions and events will cause the value of equity securities, and the Portfolio that owns them, to rise or fall. Stock markets tend to move in cycles with periods of rising prices and periods of falling prices. 
Small and Mid-Cap Company Risk: Securities of small and mid-cap companies are often less liquid than those of large companies and this could make it difficult to sell a small or mid-cap company security at a desired time or price. As a result, small and mid-cap company stocks may fluctuate relatively more in price. In general, small and mid-capitalization companies are also more vulnerable than larger companies to adverse business or economic developments and they may have more limited resources. 
Value Investment Risk: Value stocks may perform differently from the market as a whole and an investment strategy purchasing these securities may cause the Portfolio to at times underperform equity funds that use other investment strategies. Value stocks can react differently to political, economic, and industry developments than the market as a whole and other types of stocks. Value stocks also may underperform the market for long periods of time. 
Profitability Investment Risk: High relative profitability stocks may perform differently from the market as a whole and an investment strategy purchasing these securities may cause the Portfolio to at times underperform equity funds that use other investment strategies. 
Derivatives Risk: Derivatives are instruments, such as futures, and options thereon, whose value is derived from that of other assets, rates or indices. The use of derivatives for non‑hedging purposes may be considered to carry more risk than other types of investments. When the Portfolio uses derivatives, the Portfolio will be directly exposed to the risks of those derivatives. Derivative instruments are subject to a number of risks including counterparty, liquidity, interest rate, market, credit and management risks, as well as the risk of improper valuation. Changes in the value of a derivative may not correlate perfectly with the underlying asset, rate or index, and the Portfolio could lose more than the principal amount invested. 
Securities Lending Risk: Securities lending involves the risk that the borrower may fail to return the securities in a timely manner or at all. As a result, the Portfolio may lose money and there may be a delay in recovering the loaned securities. The Portfolio could also lose money if it does not recover the securities and/or the value of the collateral falls, including the value of investments made with cash collateral. Securities lending also may have certain adverse tax consequences. 
Operational Risk: Operational risks include human error, changes in personnel, system changes, faults in communication, and failures in systems, technology, or processes. Various operational events or circumstances are outside the Advisor’s control, including instances at third parties. The Portfolio and the Advisor seek to reduce these operational risks through controls and procedures. However, these measures do not address every possible risk and may be inadequate to address these risks. 
Cyber Security Risk: The Portfolio’s and its service providers’ use of internet, technology and information systems may expose the Portfolio to potential risks linked to cyber security breaches of those technological or information systems. Cyber security breaches, amongst other things, could allow an unauthorized party to gain access to proprietary information, customer data, or fund assets, or cause the Portfolio and/or its service providers to suffer data corruption or lose operational functionality. 
Risk Lose Money [Text] rr_RiskLoseMoney Because the value of your investment in the U.S. Targeted Value Portfolio will fluctuate, there is the risk that you will lose money.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table immediately following illustrate the variability of the U.S. Targeted Value Portfolio’s returns and are meant to provide some indication of the risks of investing in the Portfolio. The bar charts show the changes in the performance of Portfolio’s Class R1 shares and Class R2 shares from year to year. The table illustrates how annualized one year, five year and ten year returns of the Class R1 shares and Class R2 shares compare with those of a broad measure of market performance. The past performance of the Portfolio is not an indication of future results. Updated performance information for the Portfolio can be obtained by visiting http://us.dimensional.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table immediately following illustrate the variability of the U.S. Targeted Value Portfolio’s returns and are meant to provide some indication of the risks of investing in the Portfolio. The bar charts show the changes in the performance of Portfolio’s Class R1 shares and Class R2 shares from year to year.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress http://us.dimensional.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The past performance of the Portfolio is not an indication of future results.
Bar Chart [Heading] rr_BarChartHeading U.S. Targeted Value Portfolio Class R1 Shares—Total Returns 
Bar Chart [Heading] didgi_BarChartHeadingOne U.S. Targeted Value Portfolio Class R2 Shares—Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
January 2012‑December 2021
Highest Quarter
   
Lowest Quarter
32.73% (10/20–12/20)
   
-39.19% (1/20–3/20)
Bar Chart Closing [TextBlock] didgi_BarChartClosingTextBlockOne January 2012‑December 2021 Highest Quarter    Lowest Quarter 32.68% (10/20–12/20)    -39.22% (1/20–3/20)
Performance Table Heading rr_PerformanceTableHeading Annualized Returns (%) Periods ending December 31, 2021
Performance Table Heading didgi_PerformanceTableHeadingOne Annualized Returns (%) Periods ending December 31, 2021
R SHARES | U.S. Targeted Value Portfolio | Class R1  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fee rr_ManagementFeesOverAssets 0.27% [1]
Shareholder Services Fees rr_Component1OtherExpensesOverAssets 0.10% [1],[2]
Other Expenses rr_Component2OtherExpensesOverAssets 0.02% [1]
Total Other Expenses rr_OtherExpensesOverAssets 0.12% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.39% [1]
1 Year rr_ExpenseExampleYear01 $ 40
3 Years rr_ExpenseExampleYear03 125
5 Years rr_ExpenseExampleYear05 219
10 Years rr_ExpenseExampleYear10 493
1 Year rr_ExpenseExampleNoRedemptionYear01 40
3 Years rr_ExpenseExampleNoRedemptionYear03 125
5 Years rr_ExpenseExampleNoRedemptionYear05 219
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 493
2012 rr_AnnualReturn2012 19.06%
2013 rr_AnnualReturn2013 42.95%
2014 rr_AnnualReturn2014 2.89%
2015 rr_AnnualReturn2015 (5.84%)
2016 rr_AnnualReturn2016 26.71%
2017 rr_AnnualReturn2017 9.51%
2018 rr_AnnualReturn2018 (15.88%)
2019 rr_AnnualReturn2019 21.36%
2020 rr_AnnualReturn2020 3.69%
2021 rr_AnnualReturn2021 38.67%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 32.73%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (39.19%)
1 Year rr_AverageAnnualReturnYear01 38.67%
5 Years rr_AverageAnnualReturnYear05 9.96%
10 Years rr_AverageAnnualReturnYear10 12.88%
R SHARES | U.S. Targeted Value Portfolio | Class R2  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fee rr_ManagementFeesOverAssets 0.27% [1]
Shareholder Services Fees rr_Component1OtherExpensesOverAssets 0.25% [1],[2]
Other Expenses rr_Component2OtherExpensesOverAssets 0.02% [1]
Total Other Expenses rr_OtherExpensesOverAssets 0.27% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.54% [1]
1 Year rr_ExpenseExampleYear01 $ 55
3 Years rr_ExpenseExampleYear03 173
5 Years rr_ExpenseExampleYear05 302
10 Years rr_ExpenseExampleYear10 677
1 Year rr_ExpenseExampleNoRedemptionYear01 55
3 Years rr_ExpenseExampleNoRedemptionYear03 173
5 Years rr_ExpenseExampleNoRedemptionYear05 302
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 677
2012 rr_AnnualReturn2012 18.83%
2013 rr_AnnualReturn2013 42.68%
2014 rr_AnnualReturn2014 2.75%
2015 rr_AnnualReturn2015 (5.96%)
2016 rr_AnnualReturn2016 26.49%
2017 rr_AnnualReturn2017 9.32%
2018 rr_AnnualReturn2018 (15.98%)
2019 rr_AnnualReturn2019 21.18%
2020 rr_AnnualReturn2020 3.52%
2021 rr_AnnualReturn2021 38.49%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 32.68%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (39.22%)
1 Year rr_AverageAnnualReturnYear01 38.49%
5 Years rr_AverageAnnualReturnYear05 9.80%
10 Years rr_AverageAnnualReturnYear10 12.70%
R SHARES | U.S. Targeted Value Portfolio | Russell 2000® Value Index (reflects no deduction for fees, expenses, or taxes) | Class R1  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 28.27%
5 Years rr_AverageAnnualReturnYear05 9.07%
10 Years rr_AverageAnnualReturnYear10 12.03%
R SHARES | U.S. Targeted Value Portfolio | Russell 2000® Value Index (reflects no deduction for fees, expenses, or taxes) | Class R2  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 28.27%
5 Years rr_AverageAnnualReturnYear05 9.07%
10 Years rr_AverageAnnualReturnYear10 12.03%
[1]
The “Management Fee” and “Total Annual Fund Operating Expenses” have been adjusted to reflect the decrease in the management fee payable by the Portfolio from 0.30% to 0.27% effective February 28, 2022.
[2]
An amount up to 0.10% of the average net assets of the Portfolio’s Class R1 shares and an amount up to 0.25% of the average net assets of the Portfolio’s Class R2 shares may be used to compensate service agents that provide shareholder servicing, record keeping, account maintenance and other services to investors in the Portfolio’s Class R1 shares and Class R2 shares (“Shareholder Services Agent”).