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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DFA INVESTMENT DIMENSIONS GROUP INC
Prospectus Date rr_ProspectusDate Feb. 28, 2014
T.A. World ex U.S. Core Equity Portfolio
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading T.A. World ex U.S. Core Equity Portfolio
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the T.A. World ex U.S. Core Equity Portfolio is to achieve long-term capital appreciation while considering federal tax implications of investment decisions.
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 T.A. World ex U.S. 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)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The T.A. World ex U.S. 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. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the T.A. World ex U.S. Core Equity Portfolio’s performance. During the most recent fiscal year, the T.A. World ex U.S. Core Equity Portfolio’s portfolio turnover rate was 2% of the average value of its investment portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 2.00%
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 T.A. World ex U.S. 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 and then redeem all of your shares at the end of those periods. 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] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Dimensional Fund Advisors LP (the “Advisor”) believes that equity investing should involve a long-term view and a systematic focus on sources of expected returns, not on stock picking or market timing. In constructing an investment portfolio, the Advisor identifies a broadly diversified universe of eligible securities with precisely-defined risk and return characteristics. It then places priority on efficiently managing portfolio turnover and keeping trading costs low. In general, the Advisor does not intend to purchase or sell securities for the investment portfolio based on prospects for the economy, the securities markets or the individual issuers whose shares are eligible for purchase.

When constructing the T.A. World ex U.S. Core Equity Portfolio’s investment portfolio, the Advisor intends to consider federal tax implications when making investment decisions with respect to individual securities to seek to provide a tax advantage. When consistent with the Portfolio’s investment policies, the Advisor will buy and sell securities for the Portfolio considering the goals of: (i) delaying and minimizing the realization of net capital gains (e.g., selling stocks with capital losses to offset gains, realized or anticipated); and (ii) maximizing the extent to which any realized net capital gains are long-term in nature (i.e., taxable at lower capital gains tax rates).

The Advisor purchases for the T.A. World ex U.S. Core Equity Portfolio a broad and diverse group of securities of non-U.S. companies in countries with developed and emerging markets with a greater emphasis on small capitalization and value companies as compared to their representation in the Non-U.S. Universe. For purposes of this Portfolio, the Advisor defines the Non-U.S. Universe as a market capitalization weighted portfolio of non-U.S. companies in developed and emerging markets that have been authorized for investment as approved markets by the Advisor’s Investment Committee. The Portfolio’s increased exposure to small capitalization and value companies may be achieved by decreasing the allocation of the T.A. World ex U.S. Core Equity Portfolio’s assets to the largest growth companies relative to their weight in the Non-U.S. Universe, which would result in a greater weight allocation to small capitalization and value companies. An equity issuer is considered a growth company primarily because it has a low, non-negative book value in relation to its market capitalization. An equity issuer is considered a value company primarily because it has a high book value in relation to its market capitalization.

The T.A. World ex U.S. Core Equity Portfolio intends to purchase securities of companies associated with developed market and emerging market countries, which may include frontier markets (emerging market countries in an earlier stage of development), that the Advisor has designated as approved markets. As a non-fundamental policy, under normal circumstances, the T.A. World ex U.S. Core Equity Portfolio will invest at least 80% of its net assets in non-U.S. equity securities and/or investments that provide exposure to non-U.S. securities. The Advisor determines company size on a country or region specific basis and based primarily on market capitalization. The percentage allocation of the assets of the T.A. World ex U.S. Core Equity Portfolio to securities of the largest growth companies will generally be reduced from between 5% and 35% of their percentage weight in the Non-U.S. Universe. As of December 31, 2013, securities of the largest growth companies in the Non-U.S. Universe comprised approximately 13% of the Non-U.S. Universe and the Advisor allocated approximately 3% of the Portfolio to securities of the largest growth companies in the Non-U.S. Universe. The percentage by which the Portfolio’s allocation to securities of the largest growth companies is reduced will change due to market movements and other factors. Additionally, the T.A. World ex U.S. Core Equity Portfolio’s percentage allocation to all securities as compared to their representation in the Non-U.S. Universe may be modified after considering other factors the Advisor determines to be appropriate, such as free float, momentum, trading strategies, liquidity management, and expected profitability. In assessing expected profitability, the Advisor may consider different ratios, such as that of earnings or profits from operations relative to book value or assets.

The T.A. World ex U.S. Core Equity Portfolio may use derivatives, such as futures contracts and options on futures contracts for foreign or U.S. equity securities and indices, to gain market exposure on its uninvested cash pending investment in securities or to maintain liquidity to pay redemptions. The Portfolio may engage in spot foreign currency transactions for the purposes of settling the Portfolio’s purchases and sales of foreign securities.

The T.A. World ex U.S. Core Equity Portfolio may lend its portfolio securities to generate additional income.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock 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 T.A. World ex U.S. Core Equity Portfolio that owns them, to rise or fall. Because the value of your investment in the Portfolio will fluctuate, there is the risk that you will lose money.

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

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.

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 T.A. World ex U.S. Core Equity Portfolio does not hedge foreign currency risk.

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.

Tax Advantage Strategy Risk: An investment strategy that considers the tax implications of investment decisions may alter the construction of the T.A. World ex U.S. Core Equity Portfolio and affect portfolio holdings, when compared to those of non-tax managed mutual funds. The Advisor anticipates that performance of the Portfolio may deviate from that of non-tax managed mutual funds.

Derivatives Risk: Derivatives are instruments, such as futures and foreign exchange 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 more speculative than other types of investments. When the T.A. World ex U.S. Core Equity Portfolio uses derivatives, the Portfolio will be directly exposed to the risks of that derivative. Derivative instruments are subject to a number of risks including counterparty, liquidity, interest rate, market, credit and management risks, and 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 T.A. World ex U.S. Core Equity 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.
Risk Lose Money [Text] rr_RiskLoseMoney Because the value of your investment in the Portfolio will fluctuate, there is the risk that you will lose money.
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 T.A. World ex U.S. Core Equity 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 and since inception 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 www.dimensional.com.

The after-tax returns presented in the table for the T.A. World ex U.S. Core Equity 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-deferred 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 T.A. World ex U.S. Core Equity 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 www.dimensional.com
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 T.A. World ex U.S. Core Equity Portfolio
Total Returns (%)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock January 2009-December 2013

Highest Quarter    Lowest Quarter
33.22 (4/09-6/09)    -22.37 (7/11-9/11)
Performance Table Heading rr_PerformanceTableHeading Periods ending December 31, 2013
Annualized Returns (%)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns presented in the table for the T.A. World ex U.S. Core Equity 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-deferred arrangements, such as 401(k) plans or individual retirement accounts.
T.A. World ex U.S. Core Equity Portfolio | T.A. World ex U.S. Core Equity Portfolio - Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fee rr_ManagementFeesOverAssets 0.40%
Other Expenses rr_OtherExpensesOverAssets 0.06%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.46%
1 Year rr_ExpenseExampleYear01 47
3 Years rr_ExpenseExampleYear03 148
5 Years rr_ExpenseExampleYear05 258
10 Years rr_ExpenseExampleYear10 $ 579
2009 rr_AnnualReturn2009 48.36%
2010 rr_AnnualReturn2010 15.57%
2011 rr_AnnualReturn2011 (17.01%)
2012 rr_AnnualReturn2012 19.41%
2013 rr_AnnualReturn2013 16.61%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 33.22%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.37%)
One Year rr_AverageAnnualReturnYear01 16.61%
Five Years rr_AverageAnnualReturnYear05 14.66%
Since Inception rr_AverageAnnualReturnSinceInception 3.06%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 06, 2008
T.A. World ex U.S. Core Equity Portfolio | Return After Taxes on Distributions | T.A. World ex U.S. Core Equity Portfolio - Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 15.98%
Five Years rr_AverageAnnualReturnYear05 14.31%
Since Inception rr_AverageAnnualReturnSinceInception 2.73%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 06, 2008
T.A. World ex U.S. Core Equity Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | T.A. World ex U.S. Core Equity Portfolio - Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 10.03%
Five Years rr_AverageAnnualReturnYear05 12.02%
Since Inception rr_AverageAnnualReturnSinceInception 2.53%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 06, 2008
T.A. World ex U.S. Core Equity Portfolio | MSCI All Country World ex USA Index (net dividends) (reflects no deduction for fees, expenses, or taxes on sales)
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 15.29%
Five Years rr_AverageAnnualReturnYear05 12.81%
Since Inception rr_AverageAnnualReturnSinceInception 1.48%