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Prospectus Summary | DFA Global Real Estate Securities Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading DFA Global Real Estate Securities Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the DFA Global Real Estate Securities 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 Portfolio. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, 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

A fund generally 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 fund shares are held in a taxable account. The Portfolio does not pay transaction costs when buying and selling shares of other funds managed by the Advisor (the “Underlying Funds”); however, the Underlying Funds pay transaction costs when buying and selling securities for their portfolio. 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 3% of the average value of its investment portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 3.00%
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 Portfolio with the cost of investing in other 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 that the Portfolio’s operating expenses remain the same. The costs for the Portfolio reflect the net expenses of the Portfolio that result from the contractual expense waiver in the first year only. Although your actual costs may be higher or lower, based on these assumptions your costs whether you redeem or hold your shares would be:

Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

To achieve the DFA Global Real Estate Securities Portfolio’s investment objective, the Advisor implements an integrated investment approach that combines research, portfolio design, portfolio management, and trading functions. The Portfolio seeks to achieve exposure to a broad portfolio of securities of U.S. and non-U.S. companies in the real estate industry, with a focus on real estate investment trusts (“REITs”) or companies that the Advisor considers to be REIT-like entities. The Portfolio invests in companies of all sizes. The Portfolio may pursue its investment objective by investing its assets in the DFA Real Estate Securities Portfolio, DFA International Real Estate Securities Portfolio (the “Underlying Funds”), and/or directly in securities of companies in the real estate industry. Periodically, the Advisor will review the allocations for the Portfolio in each Underlying Fund and may adjust allocations to the Underlying Funds or may add or remove Underlying Funds in the Portfolio without notice to shareholders. The Portfolio and Underlying Funds generally consider a company to be principally engaged in the real estate industry if the company (i) derives at least 50% of its revenue or profits from the ownership, management, development, construction, or sale of residential, commercial, industrial, or other real estate; (ii) has at least 50% of the value of its assets invested in residential, commercial, industrial, or other real estate; or (iii) is organized as a REIT or REIT-like entity. REITs and REIT-like entities are types of real estate companies that pool investors’ funds for investment primarily in income producing real estate or real estate related loans or interests. The Portfolio and each Underlying Fund invest in companies principally engaged in the real estate industry in its designated market using a market capitalization weighted approach. 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 and each Underlying Fund than companies with relatively lower market capitalizations. The Advisor may adjust the representation in the Portfolio or the Underlying Funds of an eligible company, or exclude a company, after considering such factors as free float, price momentum, short-run reversals, trading strategies, liquidity, size, relative price, profitability, and other factors that the Advisor determines to be appropriate. 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 or 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. The Advisor also may limit or fix the Portfolio’s exposure to a particular country or issuer.

As a non-fundamental policy, under normal circumstances, at least 80% of the DFA Global Real Estate Securities Portfolio’s net assets will be invested directly, or indirectly through its investment in the Underlying Funds, in securities of companies in the real estate industry. The Portfolio concentrates (i.e., invests more than 25% of its net assets) its investments in securities of companies in the real estate industry. In addition to, or in place of, investments in the Underlying Funds, the Portfolio also is permitted to invest directly in the same types of securities of companies in the real estate industry that are eligible investments for the Underlying Funds. The Portfolio and each Underlying Fund intend to purchase securities of companies associated with countries that the Advisor has identified as approved markets for investment for the Portfolio or Underlying Fund. The Portfolio, directly or indirectly through its investment in the Underlying Funds, intends to invest its assets to gain exposure to at least three different countries, including the United States. As of the date of the Prospectus, the Portfolio, directly or indirectly through its investment in the Underlying Funds, invests approximately 76% of its net assets in U.S. companies. This percentage will change due to market conditions. The DFA Global Real Estate Securities Portfolio and each Underlying Fund may purchase or sell futures contracts and options on futures contracts for equity securities and indices to increase or decrease equity market exposure based on actual or expected cash inflows to or outflows from the Portfolio or Underlying Fund. Because many of the Portfolio’s and an Underlying Fund’s investments may be denominated in foreign currencies, the Portfolio and Underlying Fund may enter into foreign currency exchange transactions, including foreign currency forward contracts, in connection with the settlement of foreign securities or to transfer cash balances from one currency to another currency.

The DFA Global Real Estate Securities Portfolio and the Underlying Funds may lend their portfolio securities to generate additional income.

A summary of the investment strategies and policies of the Underlying Funds in which the DFA Global Real Estate Securities Portfolio invests as of the date of this Prospectus (other than the Underlying Funds that are included elsewhere in the Portfolio’s Prospectus) is described in the Portfolio’s Prospectus in the section entitled “ADDITIONAL INFORMATION ON INVESTMENT OBJECTIVES AND POLICIES”.
Risk [Heading] rr_RiskHeading Principal Risks
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 Portfolio’s returns and are meant to provide some indication of the risks of investing in the Portfolio. The bar chart shows the changes in the Portfolio’s performance from year to year. The table illustrates how annualized returns for certain periods, both before and after taxes, compare with those of a broad measure of market performance. The table also includes the performance of an additional index with a similar investment universe as the Portfolio. The Portfolio’s past performance (before and after taxes) is not an indication of future results. Updated performance information for the Portfolio can be obtained by visiting https://www.dimensional.com/us-en/funds.

The after-tax returns presented in the table for the Portfolio are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown in the table. In addition, the after-tax returns shown are not relevant to investors who hold shares of the Portfolio through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table immediately following illustrate the variability of the Portfolio’s returns and are meant to provide some indication of the risks of investing in the Portfolio. The bar chart shows the changes in the Portfolio’s performance from year to year.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress https://www.dimensional.com/us-en/funds
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio’s past performance (before and after taxes) is not an indication of future results.
Bar Chart [Heading] rr_BarChartHeading DFA Global Real Estate Securities Portfolio Institutional Class Shares —Total Returns
Performance Table Heading rr_PerformanceTableHeading Annualized Returns (%)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns presented in the table for the Portfolio 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 In addition, the after-tax returns shown are not relevant to investors who hold shares of the Portfolio through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Principal Risks  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Principal Risks

Because the value of your investment in the 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.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Because the value of your investment in the Portfolio will fluctuate, there is the risk that you will lose money.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Risk Not Insured [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Fund of Funds Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Fund of Funds Risk: The investment performance of a fund of funds is affected by the investment performance of the underlying funds in which the fund of funds invests. The ability of a fund of funds to achieve its investment objective depends on the ability of the underlying funds to meet their investment objectives and on the Advisor’s decisions regarding the allocation of a fund of funds’ assets among the underlying funds. A fund of funds may allocate assets to an underlying fund or asset class that underperforms other funds or asset classes. There can be no assurance that the investment objective of a fund of funds or any underlying fund will be achieved. Through its investments in the underlying funds, a fund of funds is subject to the risks of the underlying funds’ investments. When a fund of funds invests in underlying funds, investors are exposed to a proportionate share of the expenses of those underlying funds in addition to the expenses of a fund of funds. Certain risks of the Underlying Funds’ investments that are principal risks of investing in the Portfolio are described below.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Equity Market Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

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 a fund that owns them, to rise or fall. Stock markets are volatile, with periods of rising prices and periods of falling prices.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Foreign Securities and Currencies Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Foreign Securities and Currencies Risk: Foreign securities prices may decline or fluctuate because of: (a) economic or political actions of foreign governments, and/or (b) less regulated or liquid securities markets. Investors holding these securities may also be exposed to foreign currency risk (the possibility that foreign currency will fluctuate in value against the U.S. dollar or that a foreign government will convert, or be forced to convert, its currency to another currency, changing its value against the U.S. dollar). The Underlying Funds do not hedge foreign currency risk.

Foreign issuers may not be subject to uniform accounting, auditing and financial reporting standards and there may be less reliable and publicly available financial and other information about such issuers, as compared to U.S. issuers. A fund may have greater difficulty voting proxies, exercising shareholder rights, securing dividends and/or interest and obtaining information regarding corporate actions on a timely basis, pursuing legal remedies, and obtaining judgments with respect to foreign investments in foreign courts than with respect to domestic issuers in U.S. courts.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Small and Mid-Cap Company Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

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.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Risks of Concentrating in the Real Estate Industry  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Risks of Concentrating in the Real Estate Industry: A fund that concentrates (i.e., invests more than 25% of its net assets) its investments in securities of companies in the real estate industry will be exposed to the general risks of direct real estate ownership. The value of securities in the real estate industry can be affected by changes in real estate values and rental income, property taxes, and tax and regulatory requirements. Also, the value of securities in the real estate industry may decline with changes in interest rates. Investing in REITs and REIT-like entities involves certain unique risks in addition to those risks associated with investing in the real estate industry in general. REITs and REIT-like entities are dependent upon management skill, may not be diversified, and are subject to heavy cash flow dependency and self-liquidation. REITs and REIT-like entities also are subject to the possibility of failing to qualify for tax free pass-through of income. Also, many foreign REIT-like entities are deemed for tax purposes as passive foreign investment companies (PFICs), which could result in the receipt of taxable dividends to shareholders at an unfavorable tax rate. Also, because REITs and REIT-like entities typically are invested in a limited number of projects or in a particular market segment, these entities are more susceptible to adverse developments affecting a single project or market segment than more broadly diversified investments. The performance of a fund may be materially different from the broad equity market.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Emerging Markets Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Emerging Markets Risk: Securities of issuers associated with emerging market countries may be subject to higher and additional risks than securities of issuers in developed foreign markets. Numerous emerging market countries have a history of, and continue to experience serious, and potentially continuing, economic and political problems. Stock markets in many emerging market countries are relatively small, expensive to trade in and generally have higher risks than those in developed markets. Securities in emerging markets also may be less liquid than those in developed markets and foreigners are often limited in their ability to invest in, and withdraw assets from, these markets. Additional restrictions may be imposed under other conditions. Frontier market countries generally have smaller economies or less developed capital markets and, as a result, the risks of investing in emerging market countries are magnified in frontier market countries.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Derivatives Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Derivatives Risk: Derivatives are instruments, such as futures contracts, and options thereon, and foreign currency forward contracts, 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 a fund uses derivatives, the fund will be directly exposed to the risks of those derivatives. Derivative instruments are subject to a number of risks including counterparty, settlement, 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 a fund could lose more than the principal amount invested.

Prospectus Summary | DFA Global Real Estate Securities Portfolio | Securities Lending Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

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, a fund may lose money and there may be a delay in recovering the loaned securities. A fund 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.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Operational Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

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 a fund’s or its advisor’s control, including instances at third parties. A fund and its advisor seek to reduce these operational risks through controls and procedures. However, measures that seek to reduce these operational risks through controls and procedures may not address every possible risk and may be inadequate to address these risks.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Cyber Security Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Cyber Security Risk: A fund and its service providers’ use of internet, technology and information systems may expose the fund 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 fund and/or its service providers to suffer data corruption or lose operational functionality.
Prospectus Summary | DFA Global Real Estate Securities Portfolio | S&P Global REIT Index (net dividends)1  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes on sales)
Label rr_AverageAnnualReturnLabel S&P Global REIT Index (net dividends)1 [1]
Prospectus Summary | DFA Global Real Estate Securities Portfolio | S&P Global REIT Index (net dividends)1  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.77%
5 Years rr_AverageAnnualReturnYear05 0.46%
10 Years rr_AverageAnnualReturnYear10 2.98%
Prospectus Summary | DFA Global Real Estate Securities Portfolio | MSCI All Country World IMI Index (net dividends)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes on sales)
Label rr_AverageAnnualReturnLabel MSCI All Country World IMI Index (net dividends)
Prospectus Summary | DFA Global Real Estate Securities Portfolio | MSCI All Country World IMI Index (net dividends)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.37%
5 Years rr_AverageAnnualReturnYear05 9.67%
10 Years rr_AverageAnnualReturnYear10 9.00%
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.19%
Other Expenses rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees & Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.07%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.28%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.06% [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.22%
1 Year rr_ExpenseExampleYear01 $ 23
3 Years rr_ExpenseExampleYear03 84
5 Years rr_ExpenseExampleYear05 151
10 Years rr_ExpenseExampleYear10 350
1 Year rr_ExpenseExampleNoRedemptionYear01 23
3 Years rr_ExpenseExampleNoRedemptionYear03 84
5 Years rr_ExpenseExampleNoRedemptionYear05 151
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 350
Annual Return 2015 rr_AnnualReturn2015 0.69%
Annual Return 2016 rr_AnnualReturn2016 6.56%
Annual Return 2017 rr_AnnualReturn2017 9.20%
Annual Return 2018 rr_AnnualReturn2018 (4.15%)
Annual Return 2019 rr_AnnualReturn2019 26.40%
Annual Return 2020 rr_AnnualReturn2020 (6.72%)
Annual Return 2021 rr_AnnualReturn2021 30.96%
Annual Return 2022 rr_AnnualReturn2022 (23.83%)
Annual Return 2023 rr_AnnualReturn2023 9.42%
Annual Return 2024 rr_AnnualReturn2024 1.93%
Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.14%
Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.63%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 1.93%
5 Years rr_AverageAnnualReturnYear05 0.74%
10 Years rr_AverageAnnualReturnYear10 3.95%
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Institutional Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 0.78%
5 Years rr_AverageAnnualReturnYear05 (0.40%)
10 Years rr_AverageAnnualReturnYear10 2.50%
Prospectus Summary | DFA Global Real Estate Securities Portfolio | Institutional Class | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Portfolio Shares
1 Year rr_AverageAnnualReturnYear01 1.49%
5 Years rr_AverageAnnualReturnYear05 0.33%
10 Years rr_AverageAnnualReturnYear10 2.60%
[1]

Copyright® 2024 S&P Dow Jones Indices LLC, a division of S&P Global. All rights reserved.
[2]

Dimensional Fund Advisors LP (the “Advisor”) has agreed to waive certain fees and in certain instances, assume certain expenses of the Portfolio. The Fee Waiver and/or Expense Assumption Agreement for the Portfolio will remain in effect through February 28, 2026, and may only be terminated by the Fund’s Board of Directors prior to that date. Under certain circumstances, the Advisor retains the right to seek reimbursement for any fees previously waived and/or expenses previously assumed up to thirty-six months after such fee waiver and/or expense assumption.