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Registrant Name dei_EntityRegistrantName DFA INVESTMENT DIMENSIONS GROUP INC
Prospectus Date rr_ProspectusDate Nov. 04, 2019
Global Social Core Equity Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Global Social Core Equity Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the Global Social Core Equity 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 and hold shares of the Global Social Core Equity Portfolio.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2021
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Global Social Core Equity 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. The Global Social Core Equity Portfolio does not pay transaction costs when buying and selling shares of other mutual funds managed by the Advisor (the “Underlying Funds”); however, the Underlying Funds pay transaction costs when buying and selling securities for their portfolio. The transaction costs incurred by the Underlying Funds, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Global Social Core Equity Portfolio’s performance. Because the Portfolio is new, information about portfolio turnover rate is not yet available.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates The Global Social Core Equity Portfolio is a new portfolio, so the “Other Expenses” shown are based on anticipated fees and expenses for the first full fiscal year.
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 Global Social Core Equity 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. The costs for the Global Social Core Equity 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 would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Global Social Core Equity Portfolio is a “fund of funds,” which means that the Portfolio generally allocates its assets among other mutual funds managed by the Advisor, although it also has the ability to invest directly in securities and derivatives. The Global Social Core Equity Portfolio seeks to achieve exposure to a broad portfolio of securities of U.S. and non-U.S. companies with greater emphasis on small capitalization, value, and high profitability companies, by primarily purchasing shares of U.S. Social Core Equity 2 Portfolio, International Social Core Equity Portfolio, and Emerging Markets Social Core Equity Portfolio (the “Underlying Funds”). The Global Social Core Equity Portfolio may have exposure to companies in all the market capitalization ranges.

The Global Social Core Equity Portfolio typically allocates its investments among the Underlying Funds in the following manner: 30% to 60% in the U.S. Social Core Equity 2 Portfolio; 20% to 55% in the International Social Core Equity Portfolio; and 5% to 25% in the Emerging Markets Social Core Equity Portfolio.  Under normal circumstances, the Portfolio, directly or through its investments in the Underlying Funds, invests at least 40% of its net assets in non-U.S. companies (unless market conditions are not deemed favorable by the Advisor, in which case the Portfolio, directly or through its investments in the Underlying Funds, would invest at least 30% of its net assets in non-U.S. companies). Allocations by the Portfolio among the Underlying Funds within the ranges described above are determined by the relative value of the eligible universe of companies of the Underlying Funds. Periodically, the Advisor will review the allocations for the Global Social Core Equity 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.

As a non-fundamental policy, under normal circumstances, at least 80% of the Global Social Core Equity Portfolio’s net assets will be invested directly, or indirectly through its investment in the Underlying Funds, in equity securities.

The Global Social Core Equity Portfolio and each Underlying Fund may purchase or sell futures contracts and options on futures contracts for equity securities and indices, to adjust market exposure based on actual or expected cash inflows to or outflows from the Portfolio or Underlying Fund. The Portfolio and Underlying Funds do not intend to sell futures contracts to establish short positions in individual securities or to use derivatives for purposes of speculation or leveraging investment returns. The Portfolio and international and emerging markets Underlying Funds may acquire and sell foreign currency forward contracts in order to attempt to protect against uncertainty in the level of future foreign currency exchange rates. 

In addition, the Portfolio and each Underlying Fund may invest in exchange-traded funds (ETFs) and similarly structured pooled investments for the purposes of gaining exposure to the equity markets, while maintaining liquidity. In addition to money market instruments and other short-term investments, the Portfolio and each Underlying Fund may invest in affiliated and unaffiliated registered and unregistered money market funds. The Portfolio and Underlying Funds may invest in such money market funds and other short-term investments to manage cash pending investment in other securities or to maintain liquidity for the payment of redemptions or other purposes. Investments in ETFs and money market funds may involve a duplication of certain fees and expenses. The above-referenced investments are not subject to, though they may incorporate, the Portfolio’s social criteria.

The Global Social Core Equity Portfolio and Underlying Funds may lend their portfolio securities to generate additional income.

The Global Social Core Equity Portfolio and each Underlying Funds seek to purchase securities that are consistent with the Portfolio’s and Underlying Funds’ social issue screens, which are monitored by an independent third party. The Portfolio and each Underlying Fund seek to exclude from their investment portfolios those companies that are identified by the Portfolio’s and Underlying Funds’ social issue screens, as further discussed below. The Portfolio’s and Underlying Funds’ social issue screens are designed to identify companies that: (1) earn at least 20% of their total annual revenue through the production and/or sale of conventional or nuclear weapons, their weapon systems, or critical components of these products, or the provision of weapon systems support and service; (2) are engaged in business activities in or with the Republic of the Sudan that are tied to, or support, its military or government, the oil, mineral or power sectors, or that otherwise demonstrate complicity in genocide in Sudan; (3) earn at least 15% of their total annual revenue through the production and/or sale of tobacco or alcohol products, or key products or raw materials necessary for their production; (4) earn at least 20% of their total annual revenue from certain gambling activities, the production of goods used exclusively for gambling, or the provision of certain services in casinos that are fundamental to gambling operations; (5) directly participate in abortions, or develop or manufacture abortive agents or contraceptives; (6) earn at least 15% of their total annual revenue from the rental, sale, distribution or production of pornographic materials, or the ownership or operation of adult entertainment establishments; (7) are involved in the production or manufacture of landmines, cluster munitions, or the essential components of these products; (8) have had major recent controversies relating to child labor infractions in the U.S. or abroad; and/or (9) are involved in stem cell research.

The Portfolio and each Underlying Fund may modify their lists of social issue screens, at any time, without prior shareholder approval or notice.

A summary of the investment strategies and policies of the Underlying Funds in which the Global Social Core Equity Portfolio invests as of the date of this Prospectus is described in the Portfolio’s Prospectus in the section entitled “ADDITIONAL INFORMATION ON INVESTMENT OBJECTIVE AND POLICIES.”
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Because the value of your investment in the Global Social Core Equity 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.

Fund of Funds Risk: The investment performance of the Portfolio is affected by the investment performance of the Underlying Funds in which the Portfolio invests. The ability of the Portfolio 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 the Portfolio’s assets among the Underlying Funds. The Portfolio 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 the Portfolio or any Underlying Fund will be achieved. When the Portfolio invests in Underlying Funds, investors are exposed to a proportionate share of the expenses of those Underlying Funds in addition to the expenses of the Portfolio. Through its investments in the Underlying Funds, the Portfolio is subject to the risks of the Underlying Funds’ investments. Certain of the risks of the Underlying Funds’ investments are described below.

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 and each Underlying Fund that owns them, to rise or fall. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices.

Social Investment Risk: The Portfolio’s and each Underlying Funds’ social issue screens may limit the number of investment opportunities available to the Portfolio and Underlying Funds, and as a result, at times the Portfolio or an Underlying Funds may underperform funds that are not subject to such special investment conditions. For example, the Portfolio or an Underlying Fund may decline to purchase certain securities when it is otherwise advantageous to do so, or the Portfolio or an Underlying Fund may sell certain securities for social reasons when it is otherwise disadvantageous to do so.

Small Company Risk: Securities of small companies are often less liquid than those of large companies and this could make it difficult to sell a small company security at a desired time or price. As a result, small company stocks may fluctuate relatively more in price. In general, smaller 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 following a value-oriented investment strategy may cause the Portfolio and Underlying Funds to at times underperform equity funds that use other investment strategies.

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 and Underlying Funds to at times underperform equity funds that use other investment strategies.

Emerging Markets Risk: 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.

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 Portfolio and each Underlying Fund do not hedge foreign currency risk.

Derivatives Risk: Derivatives are instruments, such as futures 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 the Portfolio or Underlying Funds use derivatives, the Portfolio will be 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 and Underlying Funds 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 Underlying Funds may lose money and there may be a delay in recovering the loaned securities. The Underlying Funds could also lose money if they do 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. To the extent that the Portfolio holds securities directly and lends those securities, it will be also subject to the foregoing risks with respect to its loaned securities.

Cyber Security Risk: The Portfolio’s, Underlying Funds’, and their service providers’ use of internet, technology, and information systems may expose the Portfolio and Underlying Funds 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, Underlying Funds, and/or their service providers to suffer data corruption or lose operational functionality.
Risk Lose Money [Text] rr_RiskLoseMoney Because the value of your investment in the Global Social Core Equity 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 Performance information is not available for the Global Social Core Equity Portfolio because it has not yet commenced operations. Updated performance information for the Portfolio can be obtained in the future by visiting http://us.dimensional.com.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Performance information is not available for the Global Social Core Equity Portfolio because it has not yet commenced operations.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress http://us.dimensional.com
Global Social Core Equity Portfolio | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fee rr_ManagementFeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.06% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.33%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.39%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.03% [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.36%
1 Year rr_ExpenseExampleYear01 $ 37
3 Years rr_ExpenseExampleYear03 122
1 Year rr_ExpenseExampleNoRedemptionYear01 37
3 Years rr_ExpenseExampleNoRedemptionYear03 $ 122
[1] The Global Social Core Equity Portfolio is a new portfolio, so the “Other Expenses” shown are based on anticipated fees and expenses for the first full fiscal year.
[2] Dimensional Fund Advisors LP (the “Advisor”) has agreed to assume the ordinary other expenses of the Institutional Class of the Global Social Core Equity Portfolio to the extent necessary to limit the ordinary operating expenses of the Portfolio (including expenses incurred through its investment in other investment companies but excluding the expenses that the Portfolio incurs indirectly through investment of its securities lending cash collateral in the Money Market Series) (“Portfolio Expenses”) to 0.36% of the average net assets of the class of the Portfolio on an annualized basis (the “Expense Limitation Amount”). The maximum amount assumed under this assumption agreement is the full amount of the ordinary other expenses incurred directly by the Portfolio and, accordingly, it is possible for the net Portfolio Expenses of the Portfolio to exceed the Expense Limitation Amount under certain circumstances. The Fee Waiver and Expense Assumption Agreement for the Global Social Core Equity Portfolio will remain in effect through February 28, 2021, 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 expenses previously assumed up to thirty-six months after such expense assumption.