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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DFA INVESTMENT DIMENSIONS GROUP INC
Prospectus Date rr_ProspectusDate Feb. 28, 2012
DFA VA Global Moderate Allocation Portfolio | The DFA VA Global Moderate Allocation Portfolio
 
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_MaximumAccountFee none
Management Fee rr_ManagementFeesOverAssets 0.25% [1]
Shareholder Services Fees rr_Component1OtherExpensesOverAssets 0.10% [1],[2]
Other Expenses rr_Component3OtherExpensesOverAssets 0.10% [1]
Total Other Expenses rr_OtherExpensesOverAssets 0.20% [1]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.29% [1],[3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.74% [1]
Fee Waiver and/or Expense Reimbursement or (Recovery) rr_FeeWaiverOrReimbursementOverAssets 0.29% [1],[4]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement or (Recovery) rr_NetExpensesOverAssets 0.45% [1]
1 Year rr_ExpenseExampleYear01 46
3 Years rr_ExpenseExampleYear03 207
DFA VA Global Moderate Allocation Portfolio
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Objective [Heading] rr_ObjectiveHeading
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Expense [Heading] rr_ExpenseHeading
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption
Operating Expenses Caption [Text] rr_OperatingExpensesCaption
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates The shares of the Portfolio are new, so the operating expenses shown are based on anticipated fees and expenses for the fiscal period ending October 31, 2012
Acquired Fund Fees and Expenses, Based on Estimates [Text] rr_AcquiredFundFeesAndExpensesBasedOnEstimates Represents the amount of fees and expenses anticipated to be incurred by the Portfolio through its investments in the Underlying Funds and other investment companies for the fiscal year ending October 31, 2012
Expense Example [Heading] rr_ExpenseExampleHeading
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is meant to help you compare the cost of investing in the DFA VA Global Moderate Allocation Portfolio with the cost of investing in other mutual funds. The Example does not include any fees or charges imposed by the variable insurance contract. 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:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock
Strategy [Heading] rr_StrategyHeading
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Risk [Heading] rr_RiskHeading
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Risk Lose Money [Text] rr_RiskLoseMoney Because the value of your investment in the DFA VA Global Moderate Allocation Portfolio, there is a risk that you will lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Performance information is not available for the DFA VA Global Moderate Allocation Portfolio because it has not yet commenced operations.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.dimensional.com
[1] The shares of the Portfolio are new, so the operating expenses shown are based on anticipated fees and expenses for the fiscal period ending October 31, 2012.
[2] "Shareholder Services Fees" are paid to third parties that provide administrative and shareholder services to investors.
[3] Represents the amount of fees and expenses anticipated to be incurred by the Portfolio through its investments in the Underlying Funds and other investment companies for the fiscal year ending October 31, 2012.
[4] The Advisor has agreed to waive all or a portion of its management fee and to assume certain expenses of the Portfolio. The Amended and Restated Fee Waiver and Expense Assumption Agreement for the DFA VA Global Moderate Allocation Portfolio will remain in effect through February 28, 2013, and may not be terminated by the Advisor 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.