Objective, Primary [Text Block]

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Risk/Return [Heading]

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DFA California Intermediate-Term Municipal Bond Portfolio

Objective [Heading]

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Investment Objective

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The investment objective of the DFA California Intermediate-Term Municipal Bond Portfolio (the “California Intermediate-Term Municipal Bond Portfolio” or the “Portfolio”) is to seek to provide current income that is expected to be exempt from federal personal income taxes and California state personal income taxes.

Expense [Heading]

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Fees and Expenses of the Portfolio

Expense Narrative [Text Block]

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This table describes the fees and expenses you may pay if you buy, hold or sell shares of the California Intermediate-Term Municipal Bond 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]

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Shareholder Fees (fees paid directly from your investment):

Operating Expenses Caption [Text]

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Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)*

Fee Waiver or Reimbursement over Assets, Date of Termination

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February 28, 2023

Portfolio Turnover [Heading]

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PORTFOLIO TURNOVER

Portfolio Turnover [Text Block]

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The California Intermediate-Term Municipal Bond 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 10% of the average value of its investment portfolio.

Portfolio Turnover, Rate

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10.00%

Expenses Restated to Reflect Current [Text]

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The “Management Fee” and “Total Annual Fund Operating Expenses” have been adjusted to reflect the decrease in the management fee payable by the California Intermediate-Term Municipal Bond Portfolio from 0.18% to 0.16% effective as of February 28, 2022.

Expense Example [Heading]

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EXAMPLE

Expense Example Narrative [Text Block]

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This Example is meant to help you compare the cost of investing in the California Intermediate-Term Municipal Bond 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 that the Portfolio’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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The California Intermediate-Term Municipal Bond Portfolio seeks its investment objective by investing primarily in a universe of municipal securities issued by or on behalf of California state or local governments and their agencies, instrumentalities and regional governmental authorities, the interest on which is exempt from regular federal income tax and the state personal income tax of California. The Portfolio may also invest a portion of its assets in municipal securities issued by U.S. territories that are exempt from state taxation under federal law. Municipal securities in which the Portfolio may invest include, among others, revenue bonds, general obligation bonds, industrial development bonds, municipal lease obligations, commercial paper, variable rate demand obligations and other instruments (including participation interests in such securities). The Portfolio intends to invest in municipal securities that in the opinion of bond counsel for the issuers and under current tax law provide interest that is exempt from California and federal personal income taxes. As a fundamental investment policy, under normal market conditions, the Portfolio will invest at least 80% of its net assets in municipal securities that pay interest exempt from federal personal income tax and California state personal income taxes. The Portfolio does not currently intend to invest its assets in municipal securities whose interest is subject to the federal alternative minimum tax.

Generally, the California Intermediate-Term Municipal Bond Portfolio will acquire obligations that mature more than three years from the date of settlement. Under normal circumstances, the Portfolio will generally maintain a weighted average duration of no more than one half year greater than, and no less than one year below, the weighted average duration of the Portfolio’s benchmark, the S&P Intermediate Term California AMT-Free Municipal Bond Index, which was approximately 3.81 years as of December 31, 2021. From time to time, the Portfolio may deviate from this duration range when the Advisor determines it to be appropriate under the circumstances. In any event, the Portfolio will maintain a dollar-weighted average portfolio maturity of more than three years but less than ten years. The Portfolio intends to maintain a dollar-weighted average credit quality equal to or better than the lower of: (i) a credit quality rating of AA by S&P Global Ratings (“S&P”) or Aa2 by Moody’s Investor’s Services, Inc. (“Moody’s”) or AA by Fitch Ratings Ltd. (“Fitch”) or (ii) the credit quality of general obligation bonds issued by the state of California. For purposes of the above policy on dollar-weighted average credit quality, unrated securities may be included if such securities have been determined by the Advisor to be of comparable quality. If a security has been redeemed by the issuer at a date prior to the stated final maturity date for the purposes of the above duration and maturity restrictions, the early redemption date shall be considered the maturity date regardless of the stated final maturity. Duration is a measure of the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates.

Municipal securities are often issued to obtain funds for various public purposes, including the construction of a wide range of public facilities, such as bridges, highways, housing, hospitals, mass transportation facilities, schools, streets and public utilities, such as water and sewer works. Municipal securities include municipal leases, certificates of participation, municipal obligation components and municipal custody receipts. The California Intermediate-Term Municipal Bond Portfolio may invest more than 25% of its assets in municipal securities issued to finance projects in a particular segment of the bond market including, but not limited to, health care, housing, education, utilities, and transportation. The Portfolio also may invest more than 25% of its assets in industrial development bonds.

The California Intermediate-Term Municipal Bond Portfolio may (1) purchase certain municipal securities that are insured, (2) invest in municipal securities secured by mortgages on single-family homes and multi-family projects, (3) invest in pre‑refunded municipal securities, (4) purchase tax‑exempt municipal securities on a “when-issued” basis and (5) use derivatives, such as fixed income related futures and options contracts, credit default swaps and interest rate swaps, to hedge against changes in interest rates. The Portfolio may also invest in money market funds. The Portfolio also may purchase or sell futures contracts and options on futures contracts, to hedge its interest rate exposure or for non-hedging purposes, such as a substitute for direct investment or to increase or decrease market exposure based on actual or expected cash inflows to or outflows from the Portfolio.

Although the California Intermediate-Term Municipal Bond Portfolio attempts to invest all of its assets in tax‑exempt securities, it is possible, although not anticipated, that a portion of its assets may be invested in securities that pay taxable interest, including interest that may be subject to the federal alternative minimum tax. These investments could generate taxable income for shareholders.

The California Intermediate-Term Municipal Bond Portfolio is primarily designed for investment by California taxpayers.

Risk [Heading]

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Principal Risks

Risk Narrative [Text Block]

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Because the value of your investment in the California Intermediate-Term Municipal Bond 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.

Market Risk: Even a long-term investment approach cannot guarantee a profit. Economic, political, and issuer-specific events will cause the value of securities, and the Portfolio that owns them, to rise or fall.

Interest Rate Risk: Fixed income securities are subject to interest rate risk because the prices of fixed income securities tend to move in the opposite direction of interest rates. When interest rates rise, fixed income security prices fall. When interest rates fall, fixed income security prices rise. In general, fixed income securities with longer maturities are more sensitive to changes in interest rates. The Portfolio may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates.

Credit Risk: Credit risk is the risk that the issuer of a security, including a governmental entity, may be unable to make interest payments and/or repay principal when due. A downgrade to an issuer’s credit rating or a perceived change in an issuer’s financial strength may affect a security’s value, and thus, impact the Portfolio’s performance. The ability of a municipal securities issuer to make payments could be affected by litigation, legislation or other political events or the bankruptcy of the issuer. Credit risk is greater for fixed income securities with ratings below investment grade (e.g., BB+ or below by S&P or Fitch or Ba1 or below by Moody’s). Fixed income securities that are below investment grade involve high credit risk and are considered speculative. Below investment grade fixed income securities may also fluctuate in value more than higher quality fixed income securities and, during periods of market volatility, may be more difficult to sell at the time and price the Portfolio desires.

Income Risk: Income risk is the risk that falling interest rates will cause the Portfolio’s income to decline because, among other reasons, the proceeds from maturing short-term securities in its portfolio may be reinvested in lower-yielding securities.

Call Risk: Call risk is the risk that during periods of falling interest rates, an issuer will call or repay a higher-yielding fixed income security before its maturity date, forcing the Portfolio to reinvest in fixed income securities with lower interest rates than the original obligations.

Tax Liability Risk: Tax liability risk is the risk that distributions by the Portfolio become taxable to shareholders due to noncompliant conduct by a municipal bond issuer, unfavorable changes in federal or state tax laws, or adverse interpretations of tax laws by the Internal Revenue Service or state tax authorities or other factors. Such adverse interpretations or actions could cause interest from a security to become taxable, possibly retroactively, subjecting shareholders to increased tax liability. In addition, such adverse interpretations or actions could cause the value of a security, and therefore, the value of the Portfolio’s shares, to decline.

Municipal Securities Risk: The risk of a municipal security generally depends on the financial and credit status of the issuer. Municipal securities can be significantly affected by political, regulatory or economic changes, including changes made in the law after issuance of the securities, as well as uncertainties in the municipal market related to taxation, legislative changes or the rights of municipal security holders, including in connection with an issuer’s insolvency.

State-Specific Risk: Because the Portfolio focuses its investments primarily in California municipal securities, the value of the Portfolio’s investments will be highly sensitive to events affecting the fiscal stability of the State of California and its agencies, municipalities, authorities and other instrumentalities that issue securities. Having a significant percentage of its assets invested in the securities of fewer issuers, particularly obligations of

government issuers of a single state, could result in greater credit risk exposure to a smaller number of issuers due to economic, regulatory or political problems in California. These issues may include economic or political policy changes, tax base erosion, unfunded pension and healthcare liabilities, state constitutional limits on tax increases, budget deficits and other financial difficulties, and changes in the credit ratings assigned to municipal issuers of California. Also, to the extent that the Portfolio makes significant investments in securities issued to finance projects in a particular segment of the California municipal securities market such focused investment may cause the value of the Portfolio’s shares to change more than the value of shares of funds that invest more broadly. These risks are disclosed in more detail in the Portfolio’s Statement of Additional Information.

Derivatives Risk: Derivatives are instruments, such as swaps, futures contracts, and options thereon, whose value is derived from that of other assets, rates or indices. Derivatives can be used for hedging (attempting to reduce risk by offsetting one investment position with another) or non‑hedging purposes. Hedging with derivatives may increase expenses, and there is no guarantee that a hedging strategy will work. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains or cause losses if the market moves in a manner different from that anticipated by the Portfolio or if the cost of the derivative outweighs the benefit of the hedge. 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. Additional risks are associated with the use of swaps including counterparty and credit risk (the risk that the other party to a swap agreement will not fulfill its contractual obligations, whether because of bankruptcy or other default) and liquidity risk (the possible lack of a secondary market for the swap agreement). Credit risk increases when the Portfolio is the seller of swaps and counterparty risk increases when the Portfolio is a buyer of swaps. In addition, where the Portfolio is the seller of swaps, it may be required to liquidate portfolio securities at inopportune times in order to meet payment obligations or segregation requirements. Swaps may be illiquid or difficult to value. Additionally, payments made or received by the Portfolio under such derivatives may increase the amount of distributions taxable to you as ordinary income, increase or decrease the amount of capital gain distributions to you and/or decrease the amount available for distribution to you as exempt-interest dividends.

Liquidity Risk: Liquidity risk exists when particular portfolio investments are difficult to purchase or sell. To the extent that the Portfolio holds illiquid investments, the Portfolio’s performance may be reduced due to an inability to sell the investments at opportune prices or times. Liquid portfolio investments may become illiquid or less liquid after purchase by the Portfolio due to low trading volume, adverse investor perceptions and/or other market developments. Liquidity risk includes the risk that the Portfolio will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss or at increased costs. Liquidity risk can be more pronounced in periods of market turmoil or in situations where ownership of shares of the Portfolio are concentrated in one or a few investors.

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]

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Because the value of your investment in the California Intermediate-Term Municipal Bond Portfolio will fluctuate, there is the risk that you will lose money.

Risk Not Insured Depository Institution [Text]

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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]

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Performance

Performance Narrative [Text Block]

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The bar chart and table immediately following illustrate the variability of the California Intermediate-Term Municipal Bond 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 one year, five year and ten year returns, 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 http://us.dimensional.com.

The after-tax returns presented in the table for the California Intermediate-Term Municipal Bond 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]

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Performance Availability Website Address [Text]

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http://us.dimensional.com

Performance Past Does Not Indicate Future [Text]

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The Portfolio’s past performance (before and after taxes) is not an indication of future results.

Bar Chart [Heading]

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DFA California Intermediate-Term Municipal Bond Portfolio Institutional Class Shares—Total Returns

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January 2012-December 2021
Highest Quarter		Lowest Quarter
2.82% (4/20–6/20)		-2.40% (10/16–12/16)

Performance Table Heading

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Annualized Returns (%) Periods ending December 31, 2021

Performance Table Uses Highest Federal Rate

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Performance Table Not Relevant to Tax Deferred

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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.

DFA California Intermediate-Term Municipal Bond Portfolio | Institutional Class Shares

Shareholder Fees (fees paid directly from your investment)

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none

Management Fee

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0.16%

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Recovery of Previously Waived Fees

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0.01%

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Other Expenses

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0.04%

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Total Annual Fund Operating Expenses

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0.21%

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$ 22

3 Years

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118

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268

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3 Years

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118

Highest Quarterly Return, Label

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$ 268

2012

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2.81%

2013

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(0.73%)

2014

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5.45%

2015

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2.80%

2016

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(0.31%)

2017

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2.30%

2018

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1.36%

2019

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4.09%

2020

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2.78%

2021

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(0.53%)

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Highest Quarter

Highest Quarterly Return, Date

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Jun. 30, 2020

Highest Quarterly Return

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2.82%

Lowest Quarterly Return, Label

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Lowest Quarter

Lowest Quarterly Return, Date

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Dec. 31, 2016

Lowest Quarterly Return

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(2.40%)

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(0.53%)

rr_AverageAnnualReturnYear05

1.99%

DFA California Intermediate-Term Municipal Bond Portfolio | Return After Taxes on Distributions | Institutional Class Shares

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1.98%

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(0.53%)

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1.99%

DFA California Intermediate-Term Municipal Bond Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | Institutional Class Shares

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1.98%

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0.11%

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1.84%

DFA California Intermediate-Term Municipal Bond Portfolio | S&P Intermediate Term California AMT-Free Municipal Bond Index (reflects no deduction for fees, expenses, or taxes on sales)

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1.86%

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0.46%

rr_AverageAnnualReturnYear05

3.19%