XML 232 R604.htm IDEA: XBRL DOCUMENT v2.4.0.8
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DFA INVESTMENT DIMENSIONS GROUP INC
Prospectus Date rr_ProspectusDate Feb. 28, 2014
R10R25 SHARES | EMERGING MARKETS CORE EQUITY PORTFOLIO
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Emerging Markets Core Equity Portfolio
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the Emerging Markets Core Equity 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 Class R25 shares of the Emerging Markets 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, 2015
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Emerging Markets 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 Emerging Markets Core Equity Portfolio’s performance. During the most recent fiscal year, the Emerging Markets Core Equity Portfolio’s portfolio turnover rate was 1% of the average value of its investment portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 1.00%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates The Class R25 shares are a new class of shares of the Portfolio, so the “Other Expenses” shown for the class 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 Emerging Markets 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.

The Emerging Markets Core Equity Portfolio purchases a broad and diverse group of securities associated with emerging markets, which may include frontier markets (emerging market countries in an earlier stage of development), authorized for investment by the Advisor’s Investment Committee (“Approved Markets”), with an increased exposure to securities of small cap issuers and securities that it considers to be value securities. In assessing value, the Advisor may consider factors such as the issuer’s securities having a high book value in relation to their market value, as well as price to cash flow or price to earnings ratios. The criteria the Advisor uses for assessing value are subject to change from time to time. In addition, the Advisor may adjust the representation in the Portfolio of an eligible company, or exclude a company, after considering expected profitability relative to other eligible companies. 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.

As a non-fundamental policy, under normal circumstances, the Emerging Markets Core Equity Portfolio will invest at least 80% of its net assets in emerging markets investments that are defined in the Prospectus as Approved Market securities.

The Emerging Markets Core Equity Portfolio may gain exposure to companies in Approved Markets by purchasing equity securities in the form of depositary receipts, which may be listed or traded outside the issuer’s domicile country. The Emerging Markets Core Equity Portfolio may use derivatives, such as futures contracts and options on futures contracts for Approved Market or other equity market securities and indices, including those of the United States, to gain market exposure on its uninvested cash pending investment in securities or to maintain liquidity to pay redemptions.

The Emerging Markets Core Equity Portfolio may lend its portfolio securities to generate additional income.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock 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 Emerging Markets Core Equity Portfolio does not hedge foreign currency risk.

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 Emerging Markets 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.

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.

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.

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.

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 Emerging Markets 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 Emerging Markets Core Equity Portfolio may lose money and there may be a delay in recovering the loaned securities. The Emerging Markets Core Equity 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 Emerging Markets Core Equity Portfolio’s returns and are meant to provide some indication of the risks of investing in the Portfolio. The Class R25 shares of the Portfolio are a new class of shares for which performance information is not available, therefore, the bar chart and table show performance information for the Institutional Class shares of the Portfolio, another class of shares of the Portfolio not offered in this Prospectus. The bar chart shows the changes in performance of the Institutional Class shares of the Portfolio from year to year. The table illustrates how annualized one year, five year and since inception returns of the Institutional Class shares of the Portfolio compare with those of a broad measure of market performance. The Emerging Markets Core Equity 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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table immediately following illustrate the variability of the Emerging Markets Core Equity Portfolio’s returns and are meant to provide some indication of the risks of investing in the Portfolio. The Class R25 shares of the Portfolio are a new class of shares for which performance information is not available, therefore, the bar chart and table show performance information for the Institutional Class shares of the Portfolio, another class of shares of the Portfolio not offered in this Prospectus. The bar chart shows the changes in performance of the Institutional Class shares of the Portfolio from year to year.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Class R25 shares of the Portfolio are a new class of shares for which performance information is not available
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.dimensional.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Emerging Markets Core Equity Portfolio’s past performance (before and after taxes) is not an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Emerging Markets Core Equity Portfolio Institutional Class Shares
Total Returns (%)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock January 2006-December 2013

Highest Quarter    Lowest Quarter
40.20 (4/09-6/09)    -26.51 (10/08-12/08)
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus The Class R25 shares of the Portfolio are a new class of shares for which performance information is not available, therefore, the bar chart and table show performance information for the Institutional Class shares of the Portfolio, another class of shares of the Portfolio not offered in this Prospectus.
Performance Table Heading rr_PerformanceTableHeading Periods ending December 31, 2013
Annualized Returns (%)
R10R25 SHARES | EMERGING MARKETS CORE EQUITY PORTFOLIO | Class R25
  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fee rr_ManagementFeesOverAssets 0.55%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.32% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.12%
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 1.10%
1 Year rr_ExpenseExampleYear01 112
3 Years rr_ExpenseExampleYear03 $ 354
R10R25 SHARES | EMERGING MARKETS CORE EQUITY PORTFOLIO | INSTITUTIONAL CLASS
  
Risk/Return: rr_RiskReturnAbstract  
2006 rr_AnnualReturn2006 30.95% [3]
2007 rr_AnnualReturn2007 37.48% [3]
2008 rr_AnnualReturn2008 (50.66%) [3]
2009 rr_AnnualReturn2009 83.58% [3]
2010 rr_AnnualReturn2010 23.62% [3]
2011 rr_AnnualReturn2011 (20.65%) [3]
2012 rr_AnnualReturn2012 20.49% [3]
2013 rr_AnnualReturn2013 (2.64%) [3]
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 40.20%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.51%)
One Year rr_AverageAnnualReturnYear01 (2.64%) [3]
Five Years rr_AverageAnnualReturnYear05 16.13% [3]
Since Inception rr_AverageAnnualReturnSinceInception 10.04% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 05, 2005 [3]
R10R25 SHARES | EMERGING MARKETS CORE EQUITY PORTFOLIO | MSCI Emerging Markets Index (net dividends) (reflects no deduction for fees, expenses, or taxes on sales)
  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (2.60%)
Five Years rr_AverageAnnualReturnYear05 14.79%
Since Inception rr_AverageAnnualReturnSinceInception 9.69%
[1] The Class R25 shares are a new class of shares of the Portfolio, so the "Other Expenses" shown for the class are based on anticipated fees and expenses for the first full fiscal year.
[2] The Advisor has agreed to waive certain fees and in certain instances, assume certain expenses of the Portfolio. The Fee Waiver and Expense Assumption Agreement for the Portfolio will remain in effect through February 28, 2015, 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.
[3] The Institutional Class shares of the Portfolio would have substantially similar annual returns as the Class R25 shares because the shares are invested in the same portfolio securities. Returns for the Class R25 shares and Institutional Class shares will differ to the extent that the classes will have different expenses, and returns for the Class R25 shares would be expected to be lower than the returns of the Institutional Class shares to the extent that the Class R25 shares have higher expenses than the Institutional Class shares.