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U.S. LARGE COMPANY PORTFOLIO  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading U.S. Large Company Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The U.S. Large Company Portfolio (the “Portfolio”) seeks, as its investment objective, to approximate the total investment return of the S&P 500® Index.
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. 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 6% of the average value of its investment portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 6.00%
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

The U.S. Large Company Portfolio generally invests in the stocks that comprise the S&P 500® Index in approximately the proportions they are represented in the S&P 500® Index. The S&P 500® Index comprises a broad and diverse

group of stocks. Generally, these are the U.S. stocks with the largest market capitalizations and, as a group, they generally represent approximately 80% of the total market capitalization of all publicly traded U.S. stocks. For the Portfolio, the Advisor considers the stocks that comprise the S&P 500® Index to be those of large companies. Under normal market conditions, at least 95% of the Portfolio’s net assets will be invested in the stocks that comprise the S&P 500® Index. As a non-fundamental policy, under normal circumstances, the Portfolio will invest at least 80% of its net assets in securities of large U.S. companies.

Ordinarily, portfolio companies will not be sold except to reflect additions or deletions of the companies that comprise the S&P 500® Index, including as a result of mergers, reorganizations and similar transactions and, to the extent necessary, to provide cash to pay redemptions of the U.S. Large Company Portfolio’s shares. Given the impact on prices of securities affected by the reconstitution of the S&P 500® Index around the time of a reconstitution date, the Portfolio may purchase or sell securities that may be impacted by the reconstitution before or after the reconstitution date of the S&P 500® Index. In seeking to approximate the total investment return of the S&P 500® Index, the Advisor may also adjust the representation of securities in the Portfolio after considering such securities’ characteristics and other factors the Advisor determines to be appropriate.

The U.S. Large Company 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. Large Company Portfolio may lend its portfolio securities to generate additional income.

About the S&P 500® Index: The Standard & Poor’s 500 Composite Stock Price Index® is market capitalization weighted (adjusted for free float). Its performance is usually cyclical because it reflects periods when stock prices generally rise or fall. For information concerning S&P Global Ratings, a division of The McGraw Hill Companies (“S&P”), and disclaimers of S&P with respect to the U.S. Large Company Portfolio, see “Standard & Poor’s—Information and Disclaimers.”
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 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 U.S. Large Company 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.
U.S. LARGE COMPANY 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.
U.S. LARGE COMPANY 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.
U.S. LARGE COMPANY 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.
U.S. LARGE COMPANY 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.
U.S. LARGE COMPANY PORTFOLIO | Derivatives Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

Derivatives Risk: Derivatives are instruments, such as futures contracts, 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 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, 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.

U.S. LARGE COMPANY 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.
U.S. LARGE COMPANY 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.
U.S. LARGE COMPANY 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.
U.S. LARGE COMPANY PORTFOLIO | S&P 500® Index1  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel S&P 500® Index1 [1]
U.S. LARGE COMPANY PORTFOLIO | S&P 500® Index1  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 25.02%
5 Years rr_AverageAnnualReturnYear05 14.53%
10 Years rr_AverageAnnualReturnYear10 13.10%
U.S. LARGE COMPANY PORTFOLIO | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.06%
Other Expenses rr_OtherExpensesOverAssets 0.04%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.10%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.02% [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.08%
1 Year rr_ExpenseExampleYear01 $ 8
3 Years rr_ExpenseExampleYear03 30
5 Years rr_ExpenseExampleYear05 54
10 Years rr_ExpenseExampleYear10 126
1 Year rr_ExpenseExampleNoRedemptionYear01 8
3 Years rr_ExpenseExampleNoRedemptionYear03 30
5 Years rr_ExpenseExampleNoRedemptionYear05 54
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 126
Annual Return 2015 rr_AnnualReturn2015 1.38%
Annual Return 2016 rr_AnnualReturn2016 11.90%
Annual Return 2017 rr_AnnualReturn2017 21.73%
Annual Return 2018 rr_AnnualReturn2018 (4.43%)
Annual Return 2019 rr_AnnualReturn2019 31.42%
Annual Return 2020 rr_AnnualReturn2020 18.40%
Annual Return 2021 rr_AnnualReturn2021 28.60%
Annual Return 2022 rr_AnnualReturn2022 (18.19%)
Annual Return 2023 rr_AnnualReturn2023 26.25%
Annual Return 2024 rr_AnnualReturn2024 24.91%
Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.55%
Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.61%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.91%
5 Years rr_AverageAnnualReturnYear05 14.46%
10 Years rr_AverageAnnualReturnYear10 13.04%
U.S. LARGE COMPANY PORTFOLIO | Institutional Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 24.52%
5 Years rr_AverageAnnualReturnYear05 13.27%
10 Years rr_AverageAnnualReturnYear10 12.10%
U.S. LARGE COMPANY 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 14.99%
5 Years rr_AverageAnnualReturnYear05 11.35%
10 Years rr_AverageAnnualReturnYear10 10.62%
[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 of the Portfolio. The Fee Waiver 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 up to thirty-six months after such fee waiver.