Form N-1A Supplement |
Oct. 31, 2025 |
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|---|---|---|---|---|---|---|---|---|---|
| DFA MN Municipal Bond Portfolio | DFA MN Municipal Bond Portfolio | |||||||||
| Prospectus [Line Items] | |||||||||
| Supplement to Prospectus [Text Block] |
SUPPLEMENT TO THE STATUTORY
The purpose of this supplement to the Statutory Prospectuses dated February 28, 2026, as amended, of the portfolios listed above (each, a “Portfolio” and collectively, the “Portfolios”), each a series of DFA Investment Dimensions Group Inc. or Dimensional Investment Group Inc. (collectively, the “Funds”), is to notify shareholders that the Boards of Directors of the Funds approved reductions to the Portfolios’ management fees and reduced expense limitation amounts for the DFA Oregon Municipal Bond Portfolio and U.S. Large Company Portfolio, effective as of July 1, 2026, as described below. |
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| DFA Oregon Municipal Bond Portfolio | DFA Oregon Municipal Bond Portfolio | |||||||||
| Prospectus [Line Items] | |||||||||
| Supplement to Prospectus [Text Block] |
SUPPLEMENT TO THE STATUTORY
The purpose of this supplement to the Statutory Prospectuses dated February 28, 2026, as amended, of the portfolios listed above (each, a “Portfolio” and collectively, the “Portfolios”), each a series of DFA Investment Dimensions Group Inc. or Dimensional Investment Group Inc. (collectively, the “Funds”), is to notify shareholders that the Boards of Directors of the Funds approved reductions to the Portfolios’ management fees and reduced expense limitation amounts for the DFA Oregon Municipal Bond Portfolio and U.S. Large Company Portfolio, effective as of July 1, 2026, as described below. |
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| Institutional Class Shares Prospectus | U.S. Large Company Portfolio | |||||||||
| Prospectus [Line Items] | |||||||||
| Supplement to Prospectus [Text Block] |
SUPPLEMENT TO THE STATUTORY
The purpose of this supplement to the Statutory Prospectuses dated February 28, 2026, as amended, of the portfolios listed above (each, a “Portfolio” and collectively, the “Portfolios”), each a series of DFA Investment Dimensions Group Inc. or Dimensional Investment Group Inc. (collectively, the “Funds”), is to notify shareholders that the Boards of Directors of the Funds approved reductions to the Portfolios’ management fees and reduced expense limitation amounts for the DFA Oregon Municipal Bond Portfolio and U.S. Large Company Portfolio, effective as of July 1, 2026, as described below. |
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| ETF Class Shares Prospectus | U.S. Large Company Portfolio | |||||||||
| Prospectus [Line Items] | |||||||||
| Supplement to Prospectus [Text Block] |
SUPPLEMENT TO THE STATUTORY
The purpose of this supplement to the Statutory Prospectuses dated February 28, 2026, as amended, of the portfolios listed above (each, a “Portfolio” and collectively, the “Portfolios”), each a series of DFA Investment Dimensions Group Inc. or Dimensional Investment Group Inc. (collectively, the “Funds”), is to notify shareholders that the Boards of Directors of the Funds approved reductions to the Portfolios’ management fees and reduced expense limitation amounts for the DFA Oregon Municipal Bond Portfolio and U.S. Large Company Portfolio, effective as of July 1, 2026, as described below. |