DFA INVESTMENT DIMENSIONS GROUP INC [Member] DFA MN Municipal Bond Portfolio DFA Oregon Municipal Bond Portfolio Institutional Class Shares Prospectus ETF Class Shares Prospectus DFA MN Municipal Bond Portfolio DFA Oregon Municipal Bond Portfolio U.S. Large Company Portfolio Institutional Class Institutional Class U.S. LARGE COMPANY PORTFOLIO ETF Class doc_ DFA_ MN_ Municipal_ Bond_ Portfolio Member S000066100 Member doc_ ETF_ Class_ Shares_ Prospectus Member DFAINVESTMENTDIMENSIONSGROUPINCMember doc_ Institutional_ Class_ Shares_ Prospectus Member S000058180 Member doc_ DFA_ Oregon_ Municipal_ Bond_ Portfolio Member S000001014 Member C000268948 Member C000002765 Member C000213638 Member C000190799 Member