XML 69 R141.htm IDEA: XBRL DOCUMENT v3.3.1.900
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DFA INVESTMENT DIMENSIONS GROUP INC
Prospectus Date rr_ProspectusDate Feb. 28, 2016
DFA Global Real Estate Securities Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading DFA Global Real Estate Securities Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the DFA Global Real Estate Securities 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 DFA Global Real Estate Securities 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, 2017
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock A mutual 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 mutual fund shares are held in a taxable account. The DFA Global Real Estate Securities Portfolio does not pay transaction costs when buying and selling shares of the Underlying Funds; however, the Underlying Funds pay transaction costs when buying and selling securities for their portfolio and the DFA Global Real Estate Securities Portfolio pays transaction costs when buying and selling securities directly. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the DFA Global Real Estate Securities Portfolio’s performance. During the most recent fiscal year, the DFA Global Real Estate Securities Portfolio’s portfolio turnover rate was 1% of the average value of its direct investments portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 1.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent The “Management Fee” and “Total Annual Fund Operating Expenses” have been adjusted to reflect the decrease in the management fee payable by the Portfolio from 0.27% to 0.20% effective as of February 28, 2015.
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 DFA Global Real Estate Securities 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. The costs for the Portfolio reflect the net expenses of the Portfolio that result from the contractual expense waiver and assumption 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 DFA Global Real Estate Securities Portfolio seeks to achieve exposure to a broad portfolio of securities of U.S. and non-U.S. companies in the real estate industry, with a focus on real estate investment trusts ("REITs") or companies that Dimensional Fund Advisors LP (the "Advisor") considers to be REIT-like entities. The DFA Global Real Estate Securities Portfolio may pursue its investment objective by investing its assets in the DFA Real Estate Securities Portfolio, DFA International Real Estate Securities Portfolio (the "Underlying Funds"), and/or directly in securities of companies in the real estate industry. Periodically, the Advisor will review the allocations for the DFA Global Real Estate Securities 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. The DFA Global Real Estate Securities Portfolio and Underlying Funds generally consider a company to be principally engaged in the real estate industry if the company (i) derives at least 50% of its revenue or profits from the ownership, management, development, construction, or sale of residential, commercial, industrial, or other real estate; (ii) has at least 50% of the value of its assets invested in residential, commercial, industrial, or other real estate; or (iii) is organized as a REIT or REIT-like entity. REIT and REIT-like entities are types of real estate companies that pool investors' funds for investment primarily in income producing real estate or real estate related loans or interests. The DFA Global Real Estate Securities Portfolio and each Underlying Fund invest in companies principally engaged in the real estate industry in its designated market using a market capitalization weighted approach. A company's market capitalization is the number of its shares outstanding times its price per share. In general, the higher the relative market capitalization of a real estate company within an eligible country, the greater its representation in the Portfolio and each Underlying Fund. The Advisor may adjust the representation in the DFA Global Real Estate Securities Portfolio or the Underlying Funds of an eligible company, or exclude a company, after considering such factors as free float, momentum, trading strategies, liquidity management, profitability, and other factors that the Advisor determines to be appropriate, given market conditions. In assessing profitability, the Advisor may consider different ratios, such as that of earnings or profits from operations relative to book value or assets. The Advisor also may limit or fix the Portfolio's exposure to a particular country or issuer.

As a non-fundamental policy, under normal circumstances, at least 80% of the Portfolio's net assets will be invested directly, or indirectly through its investment in the Underlying Funds, in securities of companies in the real estate industry. In addition to, or in place of, investments in the Underlying Funds, the Portfolio also is permitted to invest directly in the same types of securities of companies in the real estate industry that are eligible investments for the Underlying Funds. The DFA Global Real Estate Securities Portfolio and each Underlying Fund intend to purchase securities of companies associated with countries that the Advisor has identified as approved markets for investment for the Portfolio and Underlying Fund.

The DFA Global Real Estate Securities Portfolio and each Underlying Fund may use derivatives, such as 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 use derivatives for purposes of speculation or leveraging investment returns.

The DFA Global Real Estate Securities Portfolio and the Underlying Funds may lend their portfolio securities to generate additional income.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration As a non-fundamental policy, under normal circumstances, at least 80% of the Portfolio's net assets will be invested directly, or indirectly through its investment in the Underlying Funds, in securities of companies in the real estate industry.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Fund of Funds Risk: The investment performance of the DFA Global Real Estate Securities Portfolio is affected by the investment performance of the Underlying Funds in which the DFA Global Real Estate Securities Portfolio invests. The ability of the DFA Global Real Estate Securities 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 Underlying Funds. The Portfolio may allocate assets to an Underlying Fund or asset class that under performs other funds or asset classes. There can be no assurance that the investment objective of the DFA Global Real Estate Securities 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 DFA Global Real Estate Securities Portfolio is subject to the risks of the Underlying Funds' investments. The risks of the DFA Global Real Estate Securities Portfolio's and Underlying Funds' investments are described below.

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 Underlying Funds do not hedge foreign currency risk.

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.

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 Underlying Funds that own them, and, in turn, the DFA Global Real Estate Securities Portfolio itself, to rise or fall. Because the value of your investment in the Portfolio will fluctuate, there is the risk that you will lose money.

Risks of Concentrating in the Real Estate Industry: The DFA Global Real Estate Securities Portfolio is concentrated in the real estate industry. The exclusive focus by DFA Global Real Estate Securities Portfolio on the real estate industry will cause the Portfolio to be exposed to the general risks of direct real estate ownership. The value of securities in the real estate industry can be affected by changes in real estate values and rental income, property taxes, and tax and regulatory requirements. Also, the value of securities in the real estate industry may decline with changes in interest rates. Investing in REITs and REIT-like entities involves certain unique risks in addition to those risks associated with investing in the real estate industry in general. REITs and REIT-like entities are dependent upon management skill, may not be diversified, and are subject to heavy cash flow dependency and self-liquidation. REITs and REIT-like entities also are subject to the possibility of failing to qualify for tax free pass-through of income. Also, many foreign REIT-like entities are deemed for tax purposes as passive foreign investment companies (PFICs), which could result in the receipt of taxable dividends to shareholders at an unfavorable tax rate. Also, because REITs and REIT-like entities typically are invested in a limited number of projects or in a particular market segment, these entities are more susceptible to adverse developments affecting a single project or market segment than more broadly diversified investments. The performance of DFA Global Real Estate Securities Portfolio may be materially different from the broad equity market.

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.

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 DFA Global Real Estate Securities Portfolio or an Underlying Fund uses derivatives, the Portfolio or Underlying Fund 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 or Underlying Fund 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 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.

Cyber Security Risk: The DFA Global Real Estate Securities 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] 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 DFA Global Real Estate Securities 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 DFA Global Real Estate Securities Portfolio’s performance from year to year. The table illustrates how annualized one year, five year and since inception returns, both before and after taxes, compare with those of a broad measure of market performance. The DFA Global Real Estate Securities 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 DFA Global Real Estate Securities 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. A negative pre-tax total return translates into a higher after-tax return because this calculation assumes that an investor received a tax deduction for the loss incurred on the sale.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table immediately following illustrate the variability of the DFA Global Real Estate Securities 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 DFA Global Real Estate Securities Portfolio’s performance from year to year.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress http://us.dimensional.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The DFA Global Real Estate Securities Portfolio’s past performance (before and after taxes) is not an indication of future results.
Bar Chart [Heading] rr_BarChartHeading DFA Global Real Estate Securities Portfolio Institutional Class Shares—Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock January 2009-December 2015

Highest Quarter    Lowest Quarter
31.45% (7/09–9/09)    -25.68% (1/09–3/09)
Performance Table Heading rr_PerformanceTableHeading Annualized Returns (%)
Periods ending December 31, 2015
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns presented in the table for the DFA Global Real Estate Securities 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.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher A negative pre-tax total return translates into a higher after-tax return because this calculation assumes that an investor received a tax deduction for the loss incurred on the sale.
DFA Global Real Estate Securities Portfolio | DFA Global Real Estate Securities Portfolio Shares  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fee rr_ManagementFeesOverAssets 0.20% [1]
Other Expenses rr_OtherExpensesOverAssets 0.02% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.16% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.38% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.14% [1],[2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.24% [1]
1 YEAR rr_ExpenseExampleYear01 $ 25
3 YEARS rr_ExpenseExampleYear03 108
5 YEARS rr_ExpenseExampleYear05 199
10 YEARS rr_ExpenseExampleYear10 $ 467
2009 rr_AnnualReturn2009 32.67%
2010 rr_AnnualReturn2010 23.79%
2011 rr_AnnualReturn2011 1.81%
2012 rr_AnnualReturn2012 23.17%
2013 rr_AnnualReturn2013 1.77%
2014 rr_AnnualReturn2014 22.74%
2015 rr_AnnualReturn2015 0.69%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 31.45%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.68%)
1 YEAR rr_AverageAnnualReturnYear01 0.69%
5 YEARS rr_AverageAnnualReturnYear05 9.54%
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 5.11%
INCEPTION DATE rr_AverageAnnualReturnInceptionDate Jun. 04, 2008
DFA Global Real Estate Securities Portfolio | Return After Taxes on Distributions | DFA Global Real Estate Securities Portfolio Shares  
Risk/Return: rr_RiskReturnAbstract  
1 YEAR rr_AverageAnnualReturnYear01 (0.25%)
5 YEARS rr_AverageAnnualReturnYear05 7.93%
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 3.40%
INCEPTION DATE rr_AverageAnnualReturnInceptionDate Jun. 04, 2008
DFA Global Real Estate Securities Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | DFA Global Real Estate Securities Portfolio Shares  
Risk/Return: rr_RiskReturnAbstract  
1 YEAR rr_AverageAnnualReturnYear01 0.49%
5 YEARS rr_AverageAnnualReturnYear05 6.79%
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 3.19%
INCEPTION DATE rr_AverageAnnualReturnInceptionDate Jun. 04, 2008
DFA Global Real Estate Securities Portfolio | S&P Global REIT Index (net dividends) (reflects no deduction for fees, expenses, or taxes on sales)  
Risk/Return: rr_RiskReturnAbstract  
1 YEAR rr_AverageAnnualReturnYear01 (0.44%) [3]
5 YEARS rr_AverageAnnualReturnYear05 8.68% [3]
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 3.86% [3]
[1] The “Management Fee” and “Total Annual Fund Operating Expenses” have been adjusted to reflect the decrease in the management fee payable by the Portfolio from 0.27% to 0.20% effective as of February 28, 2015. The “Acquired Fund Fees and Expenses” and “Total Annual Fund Operating Expenses” have also been restated to reflect current fee components. “Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement” has been adjusted to reflect an amendment to the Fee Waiver and Expense Assumption Agreement for the Portfolio with the Advisor effective as of February 28, 2015, which reduced the expense limitation amount for the Portfolio. The “Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement” for the fiscal year ended October 31, 2015 was 0.27%.
[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, 2017, 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] Copyright© 2010 Standard & Poor’s Financial Services LLC, a subsidiary of The McGraw-Hill Companies, Inc. All rights reserved.