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Dimensional 2065 Target Date Retirement Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
DFA INVESTMENT DIMENSIONS GROUP INC.
Dimensional 2065 Target Date Retirement Income Fund

SUPPLEMENT TO THE PROSPECTUS
Risk/Return [Heading] rr_RiskReturnHeading Dimensional 2065 Target Date Retirement Income Fund
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The purpose of this Supplement to the Prospectus dated February 28, 2023, of the Dimensional 2065 Target Date Retirement Income Fund (the “Portfolio”), a series of DFA Investment Dimensions Group Inc., is to notify shareholders of a change to the Portfolio’s primary benchmark. Accordingly, the “Annualized Returns” table under the “Performance” section is replaced with the following:
Performance Table Heading rr_PerformanceTableHeading Annualized Returns (%) Periods ending December 31, 2022
Dimensional 2065 Target Date Retirement Income Fund | S&P Global BMI Index (net dividends) (reflects no deduction for fees, expenses, or taxes on sales)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (18.63%) [1]
Since Inception rr_AverageAnnualReturnSinceInception 3.39% [1]
Dimensional 2065 Target Date Retirement Income Fund | FTSE World Government Bond Index, 1-3 Years, Currency-Hedged in USD Terms (reflects no deduction for fees, expenses, or taxes on sales)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.81%) [1]
Since Inception rr_AverageAnnualReturnSinceInception (0.30%) [1]
Dimensional 2065 Target Date Retirement Income Fund | S&P STRIDE Glide Path 2065 Index (reflects no deduction for fees, expenses, or taxes on sales)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (17.28%) [1]
Since Inception rr_AverageAnnualReturnSinceInception 4.93% [1]
Dimensional 2065 Target Date Retirement Income Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (15.24%)
Since Inception rr_AverageAnnualReturnSinceInception 5.08%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 02, 2020
Dimensional 2065 Target Date Retirement Income Fund | Institutional Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (15.66%)
Since Inception rr_AverageAnnualReturnSinceInception 4.49%
Dimensional 2065 Target Date Retirement Income Fund | Institutional Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (8.75%)
Since Inception rr_AverageAnnualReturnSinceInception 3.85%
[1] S&P Dow Jones Indices is discontinuing the Portfolio’s primary benchmark, the S&P STRIDE Glide Path 2065 Index. Accordingly, effective December 19, 2023, the S&P Global BMI Index (net dividends) and FTSE World Government Bond Index 1-3 Years, Currency-Hedged in USD Terms, are the Portfolio’s benchmarks.