XML 26 R2.htm IDEA: XBRL DOCUMENT v3.26.1
Shareholder Report
 6 Months Ended
Apr. 30, 2026
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name DFA INVESTMENT DIMENSIONS GROUP INC.
Entity Central Index Key 0000355437
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional VA International Small Portfolio
Class Name Institutional
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional VA International Small Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$20
0.38%1,2
[1],[2]
Expenses Paid, Amount $ 20
Expense Ratio, Percent 0.38% [1],[2]
Net Assets $ 423,013,835
Holdings Count | $ / shares 3,616
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$423,013,835
Number of Holdings
3,616
Portfolio Turnover Rate
14%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
BAWAG Group AG
0.5%
Swiss Prime Site AG
0.4%
Gaztransport Et Technigaz SA
0.4%
Finning International, Inc.
0.3%
DPM Metals, Inc.
0.3%
Accelleron Industries AG
0.3%
Belimo Holding AG
0.3%
NKT AS
0.3%
Rexel SA
0.3%
PSP Swiss Property AG
0.3%
Top Countries
(% of Total Investments) †
Japan
21.7%
Canada
14.4%
United Kingdom
11.1%
Switzerland
7.6%
Germany
7.2%
Australia
6.2%
France
6.0%
Italy
3.8%
Sweden
2.8%
Denmark
2.5%
[3]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional VA International Value Portfolio
Class Name Institutional
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional VA International Value Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$15
0.27%1,2
[4],[5]
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.27% [4],[5]
Net Assets $ 769,272,313
Holdings Count | $ / shares 511
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$769,272,313
Number of Holdings
511
Portfolio Turnover Rate
7%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
Shell PLC
4.0%
TotalEnergies SE
2.8%
Banco Santander SA
2.3%
HSBC Holdings PLC
1.6%
Toyota Motor Corp.
1.6%
Toronto-Dominion Bank
1.3%
Zurich Insurance Group AG
1.2%
BASF SE
1.2%
Suncor Energy, Inc.
1.2%
Engie SA
1.2%
Top Countries
(% of Total Investments) †
Japan
20.5%
United Kingdom
13.9%
Canada
11.8%
France
10.4%
Germany
8.3%
Switzerland
7.8%
Australia
6.1%
Netherlands
4.4%
Spain
3.2%
Italy
2.6%
[6]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional VA U.S. Targeted Value Portfolio
Class Name Institutional
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional VA U.S. Targeted Value Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$15
0.28%1,2
[7],[8]
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.28% [7],[8]
Net Assets $ 850,347,649
Holdings Count | $ / shares 1,092
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$850,347,649
Number of Holdings
1,092
Portfolio Turnover Rate
19%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
WESCO International, Inc.
0.8%
APA Corp.
0.7%
Ovintiv, Inc.
0.7%
Viatris, Inc.
0.7%
Toll Brothers, Inc.
0.6%
Performance Food Group Co.
0.6%
Ally Financial, Inc.
0.6%
BorgWarner, Inc.
0.6%
CNH Industrial NV
0.6%
First Horizon Corp.
0.5%
Sector Allocation
(% of Total Investments) †
Financials
28.5%
Industrials
17.3%
Consumer Discretionary
13.9%
Energy
11.3%
Consumer Staples
6.9%
Information Technology
6.9%
Health Care
6.3%
Materials
5.7%
Communication Services
1.9%
Real Estate
0.8%
Utilities
0.5%
[9]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional VA Short-Term Fixed Portfolio
Class Name Institutional
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional VA Short-Term Fixed Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$6
0.12%1,2
[10],[11]
Expenses Paid, Amount $ 6
Expense Ratio, Percent 0.12% [10],[11]
Net Assets $ 417,934,262
Holdings Count | $ / shares 149
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$417,934,262
Number of Holdings
149
Portfolio Turnover Rate
36%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
Commercial Paper
45.8%
Bonds
34.7%
U.S. Treasury Obligations
18.1%
Agency Obligations
1.4%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
59.8%
1 to 3 Years
40.2%
[12]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Two-Year Global Fixed Income Portfolio
Class Name Institutional
Trading Symbol DFGFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Two-Year Global Fixed Income Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$8
0.16%1
[13]
Expenses Paid, Amount $ 8
Expense Ratio, Percent 0.16% [13]
Net Assets $ 4,679,185,472
Holdings Count | $ / shares 233
Investment Company Portfolio Turnover 32.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$4,679,185,472
Number of Holdings
233
Portfolio Turnover Rate
32%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top Countries
(% of Total Investments) †
United States
21.7%
Canada
19.9%
Supranational
12.8%
Australia
8.3%
Netherlands
8.3%
New Zealand
5.8%
Sweden
5.6%
Singapore
4.4%
Germany
4.1%
Finland
3.4%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
35.0%
1 to 3 Years
64.8%
3 to 5 Years
0.2%
[14]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional VA U.S. Large Value Portfolio
Class Name Institutional
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional VA U.S. Large Value Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$11
0.20%1,2
[15],[16]
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.20% [15],[16]
Net Assets $ 832,217,763
Holdings Count | $ / shares 383
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$832,217,763
Number of Holdings
383
Portfolio Turnover Rate
8%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
JPMorgan Chase & Co.
4.4%
Exxon Mobil Corp.
3.5%
Amazon.com, Inc.
3.1%
Micron Technology, Inc.
2.8%
Johnson & Johnson
2.2%
Cisco Systems, Inc.
1.9%
Berkshire Hathaway, Inc. B
1.8%
UnitedHealth Group, Inc.
1.6%
Chevron Corp.
1.5%
Verizon Communications, Inc.
1.2%
Sector Allocation
(% of Total Investments) †
Financials
21.1%
Industrials
14.3%
Health Care
13.8%
Information Technology
13.0%
Energy
12.4%
Materials
8.0%
Consumer Discretionary
7.0%
Communication Services
5.4%
Consumer Staples
4.7%
Real Estate
0.3%
[17]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional VA Global Bond Portfolio
Class Name Institutional
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional VA Global Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$10
0.21%1,2
[18],[19]
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.21% [18],[19]
Net Assets $ 364,618,203
Holdings Count | $ / shares 235
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$364,618,203
Number of Holdings
235
Portfolio Turnover Rate
12%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top Countries
(% of Total Investments) †
Canada
19.8%
Supranational
16.6%
Germany
11.8%
Netherlands
9.8%
United States
8.9%
Australia
8.2%
France
5.3%
New Zealand
5.2%
Finland
3.9%
Belgium
3.1%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
3.4%
1 to 3 Years
26.6%
3 to 5 Years
70.0%
[20]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA One-Year Fixed Income Portfolio
Class Name Institutional
Trading Symbol DFIHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA One-Year Fixed Income Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$6
0.12%1
[21]
Expenses Paid, Amount $ 6
Expense Ratio, Percent 0.12% [21]
Net Assets $ 4,573,739,467
Holdings Count | $ / shares 161
Investment Company Portfolio Turnover 43.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$4,573,739,467
Number of Holdings
161
Portfolio Turnover Rate
43%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
Commercial Paper
49.0%
Bonds
29.0%
U.S. Treasury Obligations
21.6%
Agency Obligations
0.4%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
62.9%
1 to 3 Years
37.1%
[22]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Five-Year Global Fixed Income Portfolio
Class Name Institutional
Trading Symbol DFGBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Five-Year Global Fixed Income Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$10
0.21%1
[23]
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.21% [23]
Net Assets $ 9,483,466,997
Holdings Count | $ / shares 278
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$9,483,466,997
Number of Holdings
278
Portfolio Turnover Rate
12%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top Countries
(% of Total Investments) †
Canada
19.7%
Supranational
18.4%
Germany
11.7%
Netherlands
9.5%
Australia
8.6%
United States
6.7%
Finland
5.2%
France
5.1%
New Zealand
4.7%
Belgium
3.1%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
5.0%
1 to 3 Years
26.1%
3 to 5 Years
68.9%
[24]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Short-Term Municipal Bond Portfolio
Class Name Institutional
Trading Symbol DFSMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Short-Term Municipal Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.19%1
[25]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.19% [25]
Net Assets $ 1,376,559,253
Holdings Count | $ / shares 604
Investment Company Portfolio Turnover 64.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,376,559,253
Number of Holdings
604
Portfolio Turnover Rate
64%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
48.4%
School District
22.9%
General
5.5%
Education
3.7%
Medical
3.5%
Transportation
3.3%
Higher Education
3.1%
Water
3.1%
Commercial Paper
2.8%
Power
2.4%
Utilities
0.8%
Airport
0.4%
Facilities
0.1%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
64.3%
1 to 3 Years
23.5%
3 to 5 Years
3.2%
5 to 10 Years
8.4%
Greater than 10 Years
0.6%
[26]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Short-Term Government Portfolio
Class Name Institutional
Trading Symbol DFFGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Short-Term Government Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.17%1
[27]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.17% [27]
Net Assets $ 1,807,654,742
Holdings Count | $ / shares 29
Investment Company Portfolio Turnover 28.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,807,654,742
Number of Holdings
29
Portfolio Turnover Rate
28%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
U.S. Treasury Obligations
91.1%
Agency Obligations
8.9%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
33.4%
1 to 3 Years
66.6%
[28]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Intermediate Government Fixed Income Portfolio
Class Name Institutional
Trading Symbol DFIGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Intermediate Government Fixed Income Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$5
0.11%1
[29]
Expenses Paid, Amount $ 5
Expense Ratio, Percent 0.11% [29]
Net Assets $ 6,067,183,563
Holdings Count | $ / shares 122
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$6,067,183,563
Number of Holdings
122
Portfolio Turnover Rate
3%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
U.S. Treasury Obligations
66.4%
Agency Obligations
33.6%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
9.5%
1 to 3 Years
15.2%
3 to 5 Years
22.6%
5 to 10 Years
13.8%
Greater than 10 Years
38.9%
[30]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Social Core Equity Portfolio
Class Name Institutional
Trading Symbol DFESX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Emerging Markets Social Core Equity Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$23
0.43%1
[31]
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.43% [31]
Net Assets $ 2,099,427,589
Holdings Count | $ / shares 6,079
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$2,099,427,589
Number of Holdings
6,079
Portfolio Turnover Rate
8%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
Taiwan Semiconductor Manufacturing Co. Ltd. (2330 TT)
10.0%
Samsung Electronics Co. Ltd.
4.8%
SK Hynix, Inc.
4.1%
Tencent Holdings Ltd.
1.8%
Alibaba Group Holding Ltd.
1.2%
Taiwan Semiconductor Manufacturing Co. Ltd. (TSM US), Sponsored ADR
0.7%
China Construction Bank Corp. H
0.7%
MediaTek, Inc.
0.6%
PDD Holdings, Inc.
0.6%
Ping An Insurance Group Co. of China Ltd. H
0.5%
Top Countries
(% of Total Investments) †
Taiwan
28.4%
China
22.4%
South Korea
18.1%
India
11.8%
South Africa
3.0%
Brazil
2.8%
Saudi Arabia
2.3%
Mexico
1.8%
United Arab Emirates
1.3%
Poland
1.2%
[32]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Inflation-Protected Securities Portfolio
Class Name Institutional
Trading Symbol DIPSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Inflation-Protected Securities Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$5
0.11%1
[33]
Expenses Paid, Amount $ 5
Expense Ratio, Percent 0.11% [33]
Net Assets $ 5,139,205,595
Holdings Count | $ / shares 28
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$5,139,205,595
Number of Holdings
28
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
U.S. Treasury Obligations
100.0%
Stated Maturity Allocation
(% of Total Investments)
1 to 3 Years
34.6%
3 to 5 Years
13.8%
5 to 10 Years
23.9%
Greater than 10 Years
27.7%
[34]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA California Short-Term Municipal Bond Portfolio
Class Name Institutional
Trading Symbol DFCMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA California Short-Term Municipal Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.19%1,2
[35],[36]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.19% [35],[36]
Net Assets $ 891,231,610
Holdings Count | $ / shares 378
Investment Company Portfolio Turnover 28.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$891,231,610
Number of Holdings
378
Portfolio Turnover Rate
28%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
27.2%
School District
26.5%
General
16.3%
Water
9.2%
Higher Education
6.5%
Medical
4.4%
Commercial Paper
3.6%
Power
2.2%
Education
1.7%
Transportation
1.0%
Airport
0.7%
Pollution
0.4%
Mello-Roos
0.3%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
38.8%
1 to 3 Years
34.4%
3 to 5 Years
8.2%
5 to 10 Years
16.1%
Greater than 10 Years
2.5%
[37]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name U.S. Social Core Equity 2 Portfolio
Class Name Institutional
Trading Symbol DFUEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the U.S. Social Core Equity 2 Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$11
0.21%1
[38]
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.21% [38]
Net Assets $ 2,380,545,281
Holdings Count | $ / shares 2,062
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$2,380,545,281
Number of Holdings
2,062
Portfolio Turnover Rate
3%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
NVIDIA Corp.
6.7%
Apple, Inc.
5.2%
Microsoft Corp.
4.6%
Amazon.com, Inc.
3.9%
Meta Platforms, Inc. A
2.3%
Alphabet, Inc. A
2.1%
Alphabet, Inc. C
1.6%
JPMorgan Chase & Co.
1.3%
Broadcom, Inc.
1.2%
Caterpillar, Inc.
0.8%
Sector Allocation
(% of Total Investments)  †
Information Technology
31.9%
Financials
17.0%
Industrials
14.6%
Consumer Discretionary
11.6%
Communication Services
8.8%
Consumer Staples
5.0%
Health Care
4.1%
Materials
3.2%
Energy
2.5%
Utilities
1.0%
Real Estate
0.3%
[39]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Selectively Hedged Global Fixed Income Portfolio
Class Name Institutional
Trading Symbol DFSHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Selectively Hedged Global Fixed Income Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$8
0.17%1
[40]
Expenses Paid, Amount $ 8
Expense Ratio, Percent 0.17% [40]
Net Assets $ 1,054,897,013
Holdings Count | $ / shares 491
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,054,897,013
Number of Holdings
491
Portfolio Turnover Rate
27%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top Countries
(% of Total Investments) †
United States
25.6%
Canada
13.8%
France
8.7%
Supranational
7.9%
Germany
6.5%
Australia
6.4%
United Kingdom
4.7%
Sweden
3.8%
New Zealand
3.7%
Netherlands
3.6%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
10.8%
1 to 3 Years
25.7%
3 to 5 Years
63.5%
[41]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name U.S. Sustainability Core 1 Portfolio
Class Name Institutional
Trading Symbol DFSIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the U.S. Sustainability Core 1 Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.17%1
[42]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.17% [42]
Net Assets $ 8,342,530,038
Holdings Count | $ / shares 1,834
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$8,342,530,038
Number of Holdings
1,834
Portfolio Turnover Rate
3%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
NVIDIA Corp.
6.6%
Apple, Inc.
5.6%
Amazon.com, Inc.
3.4%
Alphabet, Inc. A
2.9%
Meta Platforms, Inc. A
2.9%
Broadcom, Inc.
2.4%
Microsoft Corp.
2.3%
Alphabet, Inc. C
2.2%
JPMorgan Chase & Co.
1.6%
Eli Lilly & Co.
1.2%
Sector Allocation
(% of Total Investments) †
Information Technology
26.5%
Financials
17.0%
Industrials
13.6%
Consumer Discretionary
12.0%
Communication Services
10.4%
Health Care
10.0%
Consumer Staples
4.6%
Materials
2.6%
Energy
2.1%
Utilities
0.9%
Real Estate
0.3%
[43]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name International Sustainability Core 1 Portfolio
Class Name Institutional
Trading Symbol DFSPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the International Sustainability Core 1 Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$12
0.23%1
[44]
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.23% [44]
Net Assets $ 4,407,558,814
Holdings Count | $ / shares 3,516
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$4,407,558,814
Number of Holdings
3,516
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
ASML Holding NV
2.1%
Novartis AG
1.1%
Roche Holding AG
1.1%
AstraZeneca PLC
0.8%
LVMH Moet Hennessy Louis Vuitton SE
0.7%
Novo Nordisk AS B
0.6%
Toyota Motor Corp.
0.6%
ABB Ltd.
0.6%
Banco Santander SA
0.6%
Siemens Energy AG
0.6%
Top Countries
(% of Total Investments) †
Japan
19.9%
United Kingdom
12.0%
Canada
11.7%
Switzerland
8.7%
France
7.8%
Germany
7.5%
Netherlands
5.9%
Australia
5.0%
Sweden
3.7%
Spain
3.3%
[45]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Short-Term Extended Quality Portfolio
Class Name Institutional
Trading Symbol DFEQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Short-Term Extended Quality Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.18%1
[46]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.18% [46]
Net Assets $ 5,869,201,964
Holdings Count | $ / shares 761
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$5,869,201,964
Number of Holdings
761
Portfolio Turnover Rate
24%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
Bonds
90.7%
Commercial Paper
6.9%
U.S. Treasury Obligations
2.4%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
20.5%
1 to 3 Years
23.2%
3 to 5 Years
56.3%
[47]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Intermediate-Term Extended Quality Portfolio
Class Name Institutional
Trading Symbol DFTEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Intermediate-Term Extended Quality Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.19%1
[48]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.19% [48]
Net Assets $ 1,811,933,353
Holdings Count | $ / shares 650
Investment Company Portfolio Turnover 9.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,811,933,353
Number of Holdings
650
Portfolio Turnover Rate
9%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
Bonds
98.6%
U.S. Treasury Obligations
1.4%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
0.2%
1 to 3 Years
3.1%
3 to 5 Years
29.1%
5 to 10 Years
30.7%
Greater than 10 Years
36.9%
[49]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional VA Global Moderate Allocation Portfolio
Class Name Institutional
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional VA Global Moderate Allocation Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$14
0.28%1,2,3
[50],[51],[52]
Expenses Paid, Amount $ 14
Expense Ratio, Percent 0.28% [50],[51],[52]
Net Assets $ 287,713,698
Holdings Count | $ / shares 12
Investment Company Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$287,713,698
Number of Holdings
12
Portfolio Turnover Rate
4%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
U.S. Core Equity 2 Portfolio
32.3%
Dimensional    VA Global Bond Portfolio
12.3%
DFA Selectively Hedged Global Fixed Income Portfolio
12.3%
U.S. Core Equity 1 Portfolio
11.6%
International Core Equity 2 Portfolio
10.9%
Emerging Markets Core Equity 2 Portfolio
6.1%
Dimensional VA Short-Term Fixed Portfolio
4.8%
DFA Two-Year Global Fixed Income Portfolio
4.8%
Dimensional    VA U.S. Large Value Portfolio
2.3%
Dimensional    VA International Value Portfolio
1.2%
[53]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA California Intermediate-Term Municipal Bond Portfolio
Class Name Institutional
Trading Symbol DCIBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA California Intermediate-Term Municipal Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$10
0.21%1
[54]
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.21% [54]
Net Assets $ 434,942,087
Holdings Count | $ / shares 380
Investment Company Portfolio Turnover 17.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$434,942,087
Number of Holdings
380
Portfolio Turnover Rate
17%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
28.8%
School District
24.9%
General
18.5%
Water
9.5%
Medical
6.8%
Higher Education
5.8%
Power
3.5%
Airport
1.0%
Transportation
0.6%
Education
0.5%
Mello-Roos
0.1%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
6.2%
1 to 3 Years
17.1%
3 to 5 Years
17.0%
5 to 10 Years
17.8%
Greater than 10 Years
41.9%
[55]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Investment Grade Portfolio
Class Name Institutional
Trading Symbol DFAPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Investment Grade Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.19%1
[56]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.19% [56]
Net Assets $ 12,610,459,817
Holdings Count | $ / shares 923
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$12,610,459,817
Number of Holdings
923
Portfolio Turnover Rate
12%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
Bonds
50.8%
U.S. Treasury Obligations
39.7%
Agency Obligations
9.5%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
8.7%
1 to 3 Years
10.2%
3 to 5 Years
24.5%
5 to 10 Years
22.3%
Greater than 10 Years
34.3%
[57]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA LTIP Portfolio
Class Name Institutional
Trading Symbol DRXIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA LTIP Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$6
0.12%1
[58]
Expenses Paid, Amount $ 6
Expense Ratio, Percent 0.12% [58]
Net Assets $ 404,422,582
Holdings Count | $ / shares 4
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$404,422,582
Number of Holdings
4
Portfolio Turnover Rate
2%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
U.S. Treasury Obligations
100.0%
Stated Maturity Allocation
(% of Total Investments)
Greater than 10 Years
100.0%
[59]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA International Government Fixed Income Portfolio (formerly, DFA World ex U.S. Government Fixed Income Portfolio)
Class Name Institutional
Trading Symbol DWFIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA International Government Fixed Income Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$10
0.20%1,2
[60],[61]
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.20% [60],[61]
Net Assets $ 1,040,249,743
Holdings Count | $ / shares 115
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,040,249,743
Number of Holdings
115
Portfolio Turnover Rate
13%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top Countries
(% of Total Investments) †
France
24.1%
Japan
19.4%
Canada
18.1%
Australia
9.2%
Supranational
6.5%
New Zealand
4.9%
Denmark
3.7%
Switzerland
3.0%
Germany
2.5%
United Kingdom
2.1%
Stated Maturity Allocation
(% of Total Investments)
3 to 5 Years
3.8%
5 to 10 Years
75.8%
Greater than 10 Years
20.4%
[62]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Intermediate-Term Municipal Bond Portfolio
Class Name Institutional
Trading Symbol DFTIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Intermediate-Term Municipal Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.19%1,2
[63],[64]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.19% [63],[64]
Net Assets $ 1,288,053,288
Holdings Count | $ / shares 691
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,288,053,288
Number of Holdings
691
Portfolio Turnover Rate
13%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
44.7%
School District
14.1%
General
10.6%
Water
6.8%
Medical
6.4%
Higher Education
4.2%
Transportation
3.6%
Power
3.6%
Utilities
2.7%
Education
1.9%
Airport
1.2%
Development
0.2%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
10.5%
1 to 3 Years
22.6%
3 to 5 Years
11.1%
5 to 10 Years
13.7%
Greater than 10 Years
42.1%
[65]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name International Social Core Equity Portfolio
Class Name Institutional
Trading Symbol DSCLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the International Social Core Equity Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$14
0.26%1
[66]
Expenses Paid, Amount $ 14
Expense Ratio, Percent 0.26% [66]
Net Assets $ 2,159,531,550
Holdings Count | $ / shares 3,958
Investment Company Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$2,159,531,550
Number of Holdings
3,958
Portfolio Turnover Rate
4%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
ASML Holding NV
1.1%
Royal Bank of Canada
0.8%
SoftBank Group Corp.
0.6%
Banco Bilbao Vizcaya Argentaria SA
0.6%
Deutsche Telekom AG
0.6%
BASF SE
0.6%
HSBC Holdings PLC
0.5%
Engie SA
0.5%
Toronto-Dominion Bank
0.5%
Mitsubishi UFJ Financial Group, Inc.
0.4%
Top Countries
(% of Total Investments) †
Japan
24.1%
Canada
12.5%
United Kingdom
9.8%
Germany
7.6%
France
7.1%
Australia
5.8%
Switzerland
5.8%
Netherlands
4.3%
Italy
3.8%
Spain
3.3%
[67]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name U.S. Large Cap Growth Portfolio
Class Name Institutional
Trading Symbol DUSLX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the U.S. Large Cap Growth Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.18%1
[68]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.18% [68]
Net Assets $ 4,339,938,389
Holdings Count | $ / shares 118
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$4,339,938,389
Number of Holdings
118
Portfolio Turnover Rate
8%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
NVIDIA Corp.
7.6%
Apple, Inc.
6.4%
Broadcom, Inc.
5.4%
Eli Lilly & Co.
4.5%
Visa, Inc. A
3.9%
Mastercard, Inc. A
3.1%
Caterpillar, Inc.
2.8%
Microsoft Corp.
2.6%
Walmart, Inc.
2.5%
Lam Research Corp.
2.4%
Sector Allocation
(% of Total Investments)  †
Information Technology
36.8%
Industrials
14.9%
Consumer Staples
10.9%
Health Care
9.4%
Consumer Discretionary
8.5%
Financials
8.0%
Communication Services
8.0%
Utilities
1.5%
Energy
1.4%
Materials
0.6%
[69]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name U.S. Small Cap Growth Portfolio
Class Name Institutional
Trading Symbol DSCGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the U.S. Small Cap Growth Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$16
0.31%1
[70]
Expenses Paid, Amount $ 16
Expense Ratio, Percent 0.31% [70]
Net Assets $ 1,922,803,121
Holdings Count | $ / shares 553
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,922,803,121
Number of Holdings
553
Portfolio Turnover Rate
11%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
Sterling Infrastructure, Inc.
0.8%
Hasbro, Inc.
0.8%
IES Holdings, Inc.
0.7%
Exelixis, Inc.
0.7%
Murphy USA, Inc.
0.6%
TTM Technologies, Inc.
0.6%
Allison Transmission Holdings, Inc.
0.6%
BJ’s Wholesale Club Holdings, Inc.
0.6%
Powell Industries, Inc.
0.6%
Aramark
0.6%
Sector Allocation
(% of Total Investments) †
Industrials
26.7%
Consumer Discretionary
17.7%
Information Technology
14.2%
Health Care
11.5%
Financials
11.0%
Materials
6.2%
Consumer Staples
5.1%
Energy
4.1%
Communication Services
2.9%
Utilities
0.3%
Real Estate
0.3%
[71]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name International Large Cap Growth Portfolio
Class Name Institutional
Trading Symbol DILRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the International Large Cap Growth Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$13
0.26%1
[72]
Expenses Paid, Amount $ 13
Expense Ratio, Percent 0.26% [72]
Net Assets $ 1,410,951,776
Holdings Count | $ / shares 457
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,410,951,776
Number of Holdings
457
Portfolio Turnover Rate
6%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
ASML Holding NV
3.8%
Roche Holding AG
2.8%
LVMH Moet Hennessy Louis Vuitton SE
1.6%
Nestle SA
1.5%
Siemens Energy AG
1.5%
Rheinmetall AG
1.3%
Safran SA
1.3%
AstraZeneca PLC
1.3%
Rolls-Royce Holdings PLC
1.3%
Sony Group Corp.
1.2%
Top Countries
(% of Total Investments) †
Japan
22.4%
United Kingdom
12.5%
Canada
11.5%
Germany
9.1%
France
8.3%
Switzerland
7.9%
Australia
6.0%
Netherlands
4.4%
Spain
3.4%
Sweden
3.0%
[73]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name International Small Cap Growth Portfolio
Class Name Institutional
Trading Symbol DISMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the International Small Cap Growth Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$23
0.45%1
[74]
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.45% [74]
Net Assets $ 316,205,379
Holdings Count | $ / shares 1,326
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$316,205,379
Number of Holdings
1,326
Portfolio Turnover Rate
11%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
VAT Group AG
1.0%
Finning International, Inc.
1.0%
Babcock International Group PLC
0.9%
Belimo Holding AG
0.9%
Accelleron Industries AG
0.8%
Gaztransport Et Technigaz SA
0.8%
Games Workshop Group PLC
0.7%
GEA Group AG
0.7%
BAWAG Group AG
0.7%
Orion OYJ B
0.7%
Top Countries
(% of Total Investments) †
Japan
21.3%
Canada
14.0%
United Kingdom
12.6%
Switzerland
8.6%
Germany
6.0%
Australia
5.9%
France
5.8%
Italy
4.6%
Spain
2.7%
Finland
2.7%
[75]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Short-Duration Real Return Portfolio
Class Name Institutional
Trading Symbol DFAIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Short-Duration Real Return Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$11
0.22%1
[76]
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.22% [76]
Net Assets $ 2,195,493,607
Holdings Count | $ / shares 708
Investment Company Portfolio Turnover 25.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$2,195,493,607
Number of Holdings
708
Portfolio Turnover Rate
25%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top Countries
(% of Total Investments) †
United States
49.0%
Supranational
5.9%
Australia
5.7%
France
5.4%
Canada
5.1%
Germany
4.5%
Japan
3.5%
New Zealand
3.0%
United Kingdom
2.9%
Sweden
2.6%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
17.4%
1 to 3 Years
20.0%
3 to 5 Years
62.5%
5 to 10 Years
0.1%
[77]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Municipal Real Return Portfolio
Class Name Institutional
Trading Symbol DMREX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Municipal Real Return Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$12
0.24%1
[78]
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.24% [78]
Net Assets $ 1,801,682,231
Holdings Count | $ / shares 604
Investment Company Portfolio Turnover 33.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,801,682,231
Number of Holdings
604
Portfolio Turnover Rate
33%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
55.2%
School District
16.8%
General
7.5%
Water
5.1%
Education
3.7%
Higher Education
3.3%
Transportation
2.9%
Power
2.2%
Medical
1.2%
Utilities
1.2%
Commercial Paper
0.8%
Airport
0.1%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
37.2%
1 to 3 Years
39.1%
3 to 5 Years
5.8%
5 to 10 Years
9.5%
Greater than 10 Years
8.4%
[79]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Municipal Bond Portfolio
Class Name Institutional
Trading Symbol DFMPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Municipal Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$10
0.21%1
[80]
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.21% [80]
Net Assets $ 468,308,612
Holdings Count | $ / shares 375
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$468,308,612
Number of Holdings
375
Portfolio Turnover Rate
23%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
52.1%
School District
18.7%
Water
8.1%
General
5.4%
Transportation
4.9%
Utilities
2.9%
Power
2.6%
Education
2.2%
Higher Education
1.4%
Commercial Paper
0.8%
Medical
0.6%
Facilities
0.2%
Airport
0.1%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
22.4%
1 to 3 Years
19.6%
3 to 5 Years
11.1%
5 to 10 Years
9.9%
Greater than 10 Years
37.0%
[81]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional VIT Inflation-Protected Securities Portfolio
Class Name Institutional
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional VIT Inflation-Protected Securities Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$5
0.11%1,2
[82],[83]
Expenses Paid, Amount $ 5
Expense Ratio, Percent 0.11% [82],[83]
Net Assets $ 241,001,035
Holdings Count | $ / shares 24
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$241,001,035
Number of Holdings
24
Portfolio Turnover Rate
19%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
U.S. Treasury Obligations
100.0%
Stated Maturity Allocation
(% of Total Investments)
1 to 3 Years
17.5%
3 to 5 Years
19.0%
5 to 10 Years
43.2%
Greater than 10 Years
20.3%
[84]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Targeted Credit Portfolio
Class Name Institutional
Trading Symbol DTCPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Targeted Credit Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$10
0.20%1,2
[85],[86]
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.20% [85],[86]
Net Assets $ 836,132,004
Holdings Count | $ / shares 411
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$836,132,004
Number of Holdings
411
Portfolio Turnover Rate
24%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top Countries
(% of Total Investments) †
United States
40.9%
Canada
13.4%
France
7.5%
Germany
6.0%
United Kingdom
4.8%
Australia
4.4%
Spain
3.8%
Japan
3.8%
Sweden
3.4%
Netherlands
2.8%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
10.5%
1 to 3 Years
16.6%
3 to 5 Years
72.9%
[87]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA NY Municipal Bond Portfolio
Class Name Institutional
Trading Symbol DNYMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA NY Municipal Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$12
0.25%1,2
[88],[89]
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.25% [88],[89]
Net Assets $ 183,869,436
Holdings Count | $ / shares 136
Investment Company Portfolio Turnover 29.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$183,869,436
Number of Holdings
136
Portfolio Turnover Rate
29%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
35.7%
General
26.0%
School District
18.2%
Transportation
6.1%
Higher Education
5.4%
Airport
3.7%
Water
1.5%
Education
1.3%
Development
1.2%
Utilities
0.5%
Medical
0.4%
Stated Maturity Allocation  
(% of Total Investments)  
Less than 1 Year
43.9%
1 to 3 Years
14.7%
3 to 5 Years
9.9%
5 to 10 Years
24.0%
Greater than 10 Years
7.5%
[90]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional Retirement Income Fund
Class Name Institutional
Trading Symbol TDIFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.18%1,2
[91],[92]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.18% [91],[92]
Net Assets $ 58,419,123
Holdings Count | $ / shares 8
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$58,419,123
Number of Holdings
8
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
DFA Inflation-Protected Securities Portfolio
47.9%
DFA One-Year Fixed Income Portfolio
31.9%
U.S. Large Company Portfolio
7.1%
U.S. Core Equity 1 Portfolio
7.1%
Large Cap International Portfolio
2.7%
Emerging Markets Core Equity 2 Portfolio
2.0%
International Core Equity 2 Portfolio
1.3%
[93]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2045 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DRIIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2045 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.18%1
[94]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.18% [94]
Net Assets $ 236,303,507
Holdings Count | $ / shares 9
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$236,303,507
Number of Holdings
9
Portfolio Turnover Rate
6%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
U.S. Large Company Portfolio
26.9%
U.S. Core Equity 1 Portfolio
26.8%
Large Cap International Portfolio
10.0%
DFA Two-Year Global Fixed Income Portfolio
9.5%
DFA Short-Term Extended Quality Portfolio
9.5%
Emerging Markets Core Equity 2 Portfolio
7.5%
International Core Equity 2 Portfolio
5.0%
DFA LTIP Portfolio
4.8%
[95]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2050 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DRIJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2050 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$10
0.19%1
[96]
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.19% [96]
Net Assets $ 209,136,742
Holdings Count | $ / shares 8
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$209,136,742
Number of Holdings
8
Portfolio Turnover Rate
10%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
U.S. Core Equity 1 Portfolio
31.3%
U.S. Large Company Portfolio
31.3%
Large Cap International Portfolio
11.6%
Emerging Markets Core Equity 2 Portfolio
8.8%
International Core Equity 2 Portfolio
5.8%
DFA Short-Term Extended Quality Portfolio
5.6%
DFA Two-Year Global Fixed Income Portfolio
5.6%
[97]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2055 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DRIKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2055 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$10
0.19%1
[98]
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.19% [98]
Net Assets $ 150,664,201
Holdings Count | $ / shares 7
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$150,664,201
Number of Holdings
7
Portfolio Turnover Rate
10%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
U.S. Core Equity 1 Portfolio
33.6%
U.S. Large Company Portfolio
33.5%
Large Cap International Portfolio
12.4%
Emerging Markets Core Equity 2 Portfolio
9.3%
International Core Equity 2 Portfolio
6.2%
DFA Short-Term Extended Quality Portfolio
2.5%
DFA Two-Year Global Fixed Income Portfolio
2.5%
[99]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2060 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DRILX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2060 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$11
0.21%1,2
[100],[101]
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.21% [100],[101]
Net Assets $ 130,184,870
Holdings Count | $ / shares 8
Investment Company Portfolio Turnover 9.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$130,184,870
Number of Holdings
8
Portfolio Turnover Rate
9%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
U.S. Large Company Portfolio
33.5%
U.S. Core Equity 1 Portfolio
33.5%
Large Cap International Portfolio
12.4%
Emerging Markets Core Equity 2 Portfolio
9.4%
International Core Equity 2 Portfolio
6.2%
DFA Two-Year Global Fixed Income Portfolio
2.5%
DFA Short-Term Extended Quality Portfolio
2.5%
[102]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2015 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DRIQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2015 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.18%1,2
[103],[104]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.18% [103],[104]
Net Assets $ 21,626,180
Holdings Count | $ / shares 8
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$21,626,180
Number of Holdings
8
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
DFA Inflation-Protected Securities Portfolio
76.0%
U.S. Large Company Portfolio
8.5%
U.S. Core Equity 1 Portfolio
8.4%
Large Cap International Portfolio
3.1%
Emerging Markets Core Equity 2 Portfolio
2.4%
International Core Equity 2 Portfolio
1.6%
[105]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2020 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DRIRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2020 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.18%1,2
[106],[107]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.18% [106],[107]
Net Assets $ 56,429,723
Holdings Count | $ / shares 7
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$56,429,723
Number of Holdings
7
Portfolio Turnover Rate
3%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
DFA Inflation-Protected Securities Portfolio
65.7%
DFA LTIP Portfolio
9.1%
U.S. Core Equity 1 Portfolio
8.9%
U.S. Large Company Portfolio
8.9%
Large Cap International Portfolio
3.3%
Emerging Markets Core Equity 2 Portfolio
2.5%
International Core Equity 2 Portfolio
1.6%
[108]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2025 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DRIUX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2025 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.17%1
[109]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.17% [109]
Net Assets $ 111,830,910
Holdings Count | $ / shares 8
Investment Company Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$111,830,910
Number of Holdings
8
Portfolio Turnover Rate
4%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
DFA Inflation-Protected Securities Portfolio
56.9%
DFA LTIP Portfolio
17.9%
U.S. Core Equity 1 Portfolio
8.9%
U.S. Large Company Portfolio
8.9%
Large Cap International Portfolio
3.3%
Emerging Markets Core Equity 2 Portfolio
2.5%
International Core Equity 2 Portfolio
1.6%
[110]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2030 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DRIWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2030 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.17%1
[111]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.17% [111]
Net Assets $ 154,019,987
Holdings Count | $ / shares 10
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$154,019,987
Number of Holdings
10
Portfolio Turnover Rate
6%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
DFA Inflation-Protected Securities Portfolio
31.3%
DFA LTIP Portfolio
28.7%
U.S. Core Equity 1 Portfolio
12.7%
U.S. Large Company Portfolio
12.7%
Large Cap International Portfolio
4.8%
Emerging Markets Core Equity 2 Portfolio
3.6%
International Core Equity 2 Portfolio
2.4%
DFA Short-Term Extended Quality Portfolio
1.9%
DFA Two-Year Global Fixed Income Portfolio
1.9%
[112]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2035 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DRIGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2035 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.17%1
[113]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.17% [113]
Net Assets $ 196,400,165
Holdings Count | $ / shares 10
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$196,400,165
Number of Holdings
10
Portfolio Turnover Rate
6%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
DFA LTIP Portfolio
32.1%
U.S. Core Equity 1 Portfolio
17.3%
U.S. Large Company Portfolio
17.3%
DFA Inflation-Protected Securities Portfolio
9.6%
Large Cap International Portfolio
6.5%
Emerging Markets Core Equity 2 Portfolio
4.9%
DFA Short-Term Extended Quality Portfolio
4.5%
DFA Two-Year Global Fixed Income Portfolio
4.5%
International Core Equity 2 Portfolio
3.3%
[114]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2040 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DRIHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2040 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$9
0.18%1
[115]
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.18% [115]
Net Assets $ 202,773,072
Holdings Count | $ / shares 9
Investment Company Portfolio Turnover 6.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$202,773,072
Number of Holdings
9
Portfolio Turnover Rate
6%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
DFA LTIP Portfolio
22.6%
U.S. Large Company Portfolio
22.4%
U.S. Core Equity 1 Portfolio
22.3%
Large Cap International Portfolio
8.4%
DFA Short-Term Extended Quality Portfolio
7.0%
DFA Two-Year Global Fixed Income Portfolio
6.9%
Emerging Markets Core Equity 2 Portfolio
6.2%
International Core Equity 2 Portfolio
4.2%
[116]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Social Fixed Income Portfolio
Class Name Institutional
Trading Symbol DSFIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Social Fixed Income Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$10
0.21%1
[117]
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.21% [117]
Net Assets $ 716,224,387
Holdings Count | $ / shares 422
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$716,224,387
Number of Holdings
422
Portfolio Turnover Rate
13%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Security Type
(% of Total Investments) †
Bonds
50.9%
U.S. Treasury Obligations
42.3%
Agency Obligations
6.8%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
8.5%
1 to 3 Years
10.5%
3 to 5 Years
22.1%
5 to 10 Years
24.5%
Greater than 10 Years
34.4%
[118]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Diversified Fixed Income Portfolio
Class Name Institutional
Trading Symbol DFXIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Diversified Fixed Income Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$7
0.15%1,2
[119],[120]
Expenses Paid, Amount $ 7
Expense Ratio, Percent 0.15% [119],[120]
Net Assets $ 1,678,094,040
Holdings Count | $ / shares 8
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,678,094,040
Number of Holdings
8
Portfolio Turnover Rate
3%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
DFA Intermediate Government Fixed Income Portfolio
50.1%
DFA Two-Year Global Fixed Income Portfolio
30.0%
U.S. Treasury Inflation-Indexed Notes    0.125% due 01/15/32
5.1%
U.S. Treasury Inflation-Indexed Notes    1.750% due 01/15/34
5.0%
U.S. Treasury Inflation-Indexed Bonds    3.375% due 04/15/32
4.8%
U.S. Treasury Inflation-Indexed Notes    0.125% due 07/15/31
3.0%
U.S. Treasury Inflation-Indexed Notes    2.125% due 01/15/35
2.0%
[121]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional VA Equity Allocation Portfolio
Class Name Institutional
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional VA Equity Allocation Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$16
0.31%1,2,3
[122],[123],[124]
Expenses Paid, Amount $ 16
Expense Ratio, Percent 0.31% [122],[123],[124]
Net Assets $ 304,659,877
Holdings Count | $ / shares 10
Investment Company Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$304,659,877
Number of Holdings
10
Portfolio Turnover Rate
4%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
U.S. Core Equity 1 Portfolio
28.2%
U.S. Large Company Portfolio
22.6%
Dimensional VA U.S. Targeted Value Portfolio
12.7%
International Core Equity 2 Portfolio
11.9%
Emerging Markets Core Equity 2 Portfolio
9.2%
Dimensional    VA U.S. Large Value Portfolio
7.1%
Dimensional VA International Small Portfolio
3.7%
Dimensional    VA International Value Portfolio
2.8%
DFA Real Estate Securities Portfolio
1.3%
DFA International Real Estate Securities Portfolio
0.5%
[125]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA MN Municipal Bond Portfolio
Class Name Institutional
Trading Symbol DMNBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA MN Municipal Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$15
0.30%1,2
[126],[127]
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.30% [126],[127]
Net Assets $ 27,756,143
Holdings Count | $ / shares 86
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$27,756,143
Number of Holdings
86
Portfolio Turnover Rate
24%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
64.1%
School District
27.6%
Education
2.0%
Medical
1.5%
Higher Education
1.3%
Water
1.2%
Airport
1.1%
General
0.7%
Utilities
0.5%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
38.4%
1 to 3 Years
47.6%
3 to 5 Years
3.2%
5 to 10 Years
10.0%
Greater than 10 Years
0.8%
[128]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA California Municipal Real Return Portfolio
Class Name Institutional
Trading Symbol DCARX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA California Municipal Real Return Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$13
0.25%1
[129]
Expenses Paid, Amount $ 13
Expense Ratio, Percent 0.25% [129]
Net Assets $ 396,418,661
Holdings Count | $ / shares 338
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$396,418,661
Number of Holdings
338
Portfolio Turnover Rate
27%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
29.6%
School District
24.2%
General
21.7%
Higher Education
7.2%
Water
6.2%
Power
3.1%
Medical
2.9%
Commercial Paper
2.8%
Education
1.3%
Transportation
0.7%
Mello-Roos
0.2%
Airport
0.1%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
27.9%
1 to 3 Years
44.2%
3 to 5 Years
9.1%
5 to 10 Years
11.5%
Greater than 10 Years
7.3%
[130]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Global Core Plus Fixed Income Portfolio
Class Name Institutional
Trading Symbol DGCFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Global Core Plus Fixed Income Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$11
0.23%1,2
[131],[132]
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.23% [131],[132]
Net Assets $ 2,913,097,730
Holdings Count | $ / shares 662
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$2,913,097,730
Number of Holdings
662
Portfolio Turnover Rate
21%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top Countries
(% of Total Investments) †
United States
53.6%
Canada
14.5%
Australia
6.4%
France
5.9%
Japan
5.1%
Germany
3.2%
United Kingdom
1.8%
Netherlands
1.3%
Italy
1.2%
Supranational
1.2%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
2.5%
1 to 3 Years
5.3%
3 to 5 Years
10.3%
5 to 10 Years
53.2%
Greater than 10 Years
28.7%
[133]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Sustainability Core 1 Portfolio
Class Name Institutional
Trading Symbol DESIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Emerging Markets Sustainability Core 1 Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$22
0.42%1,2
[134],[135]
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.42% [134],[135]
Net Assets $ 1,300,939,767
Holdings Count | $ / shares 4,887
Investment Company Portfolio Turnover 3.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,300,939,767
Number of Holdings
4,887
Portfolio Turnover Rate
3%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
Taiwan Semiconductor Manufacturing Co. Ltd. (2330 TT)
5.7%
Samsung Electronics Co. Ltd. (005930KS)
3.2%
Tencent Holdings Ltd.
3.0%
Taiwan Semiconductor Manufacturing Co. Ltd. (TSM US), Sponsored ADR
2.2%
SK Hynix, Inc.
1.8%
Samsung Electronics Co. Ltd. (SMSN LI), GDR
1.4%
Alibaba Group Holding Ltd.
1.3%
MediaTek, Inc.
0.8%
Delta Electronics, Inc.
0.6%
Hon Hai Precision Industry Co. Ltd.
0.6%
Top Countries
(% of Total Investments) †
China
25.0%
Taiwan
24.2%
South Korea
19.0%
India
12.2%
Brazil
4.1%
South Africa
2.4%
Saudi Arabia
2.3%
Mexico
1.9%
United Arab Emirates
1.5%
Poland
1.2%
[136]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Global Sustainability Fixed Income Portfolio
Class Name Institutional
Trading Symbol DGSFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Global Sustainability Fixed Income Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$11
0.22%1
[137]
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.22% [137]
Net Assets $ 689,592,903
Holdings Count | $ / shares 246
Investment Company Portfolio Turnover 17.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$689,592,903
Number of Holdings
246
Portfolio Turnover Rate
17%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top Countries
(% of Total Investments) †
United States
29.8%
Canada
15.4%
Supranational
14.3%
Japan
6.6%
Australia
5.9%
France
5.9%
Germany
4.4%
United Kingdom
4.0%
Netherlands
3.7%
Belgium
3.1%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
3.2%
1 to 3 Years
19.0%
3 to 5 Years
10.1%
5 to 10 Years
24.6%
Greater than 10 Years
43.1%
[138]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Oregon Municipal Bond Portfolio
Class Name Institutional
Trading Symbol DOGMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Oregon Municipal Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$15
0.30%1,2
[139],[140]
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.30% [139],[140]
Net Assets $ 99,865,081
Holdings Count | $ / shares 160
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$99,865,081
Number of Holdings
160
Portfolio Turnover Rate
8%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
Medical
32.5%
Transportation
17.1%
Higher Education
12.1%
General
11.3%
General Obligation
10.0%
School District
7.3%
Water
5.0%
Development
3.2%
Utilities
1.0%
Power
0.5%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
17.0%
1 to 3 Years
18.0%
3 to 5 Years
10.4%
5 to 10 Years
23.0%
Greater than 10 Years
31.6%
[141]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Selective State Municipal Bond Portfolio
Class Name Institutional
Trading Symbol DSSMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Selective State Municipal Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$11
0.23%1,2
[142],[143]
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.23% [142],[143]
Net Assets $ 574,551,180
Holdings Count | $ / shares 601
Investment Company Portfolio Turnover 22.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$574,551,180
Number of Holdings
601
Portfolio Turnover Rate
22%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
30.2%
Medical
16.7%
School District
15.3%
General
8.7%
Transportation
6.1%
Power
5.4%
Water
5.2%
Higher Education
3.7%
Utilities
2.9%
Commercial Paper
2.3%
Education
1.8%
Airport
1.1%
Development
0.3%
Bond Bank
0.1%
Housing
0.1%
Facilities
0.1%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
15.2%
1 to 3 Years
11.2%
3 to 5 Years
9.4%
5 to 10 Years
19.2%
Greater than 10 Years
45.0%
[144]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Global Social Core Equity Portfolio
Class Name Institutional
Trading Symbol DGBEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Global Social Core Equity Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$17
0.32%1,2
[145],[146]
Expenses Paid, Amount $ 17
Expense Ratio, Percent 0.32% [145],[146]
Net Assets $ 97,180,073
Holdings Count | $ / shares 4
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$97,180,073
Number of Holdings
4
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
U.S. Social Core Equity 2 Portfolio
61.5%
International Social Core Equity Portfolio
25.6%
Emerging Markets Social Core Equity Portfolio
12.9%
[147]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2065 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DTDRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2065 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$11
0.21%1,2
[148],[149]
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.21% [148],[149]
Net Assets $ 50,741,019
Holdings Count | $ / shares 8
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$50,741,019
Number of Holdings
8
Portfolio Turnover Rate
8%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
U.S. Core Equity 1 Portfolio
33.5%
U.S. Large Company Portfolio
33.5%
Large Cap International Portfolio
12.4%
Emerging Markets Core Equity 2 Portfolio
9.4%
International Core Equity 2 Portfolio
6.2%
DFA Short-Term Extended Quality Portfolio
2.5%
DFA Two-Year Global Fixed Income Portfolio
2.5%
[150]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name U.S. Sustainability Targeted Value Portfolio
Class Name Institutional
Trading Symbol DAABX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the U.S. Sustainability Targeted Value Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$17
0.32%1
[151]
Expenses Paid, Amount $ 17
Expense Ratio, Percent 0.32% [151]
Net Assets $ 592,277,439
Holdings Count | $ / shares 902
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$592,277,439
Number of Holdings
902
Portfolio Turnover Rate
13%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
Viatris, Inc.
1.1%
TTM Technologies, Inc.
1.0%
WESCO International, Inc.
0.9%
Ball Corp.
0.9%
Toll Brothers, Inc.
0.8%
Amkor Technology, Inc.
0.8%
CNH Industrial NV
0.8%
TD SYNNEX Corp.
0.8%
BorgWarner, Inc.
0.7%
Arrow Electronics, Inc.
0.6%
Sector Allocation
(% of Total Investments) †
Financials
28.3%
Industrials
18.2%
Consumer Discretionary
16.0%
Information Technology
10.3%
Health Care
8.6%
Materials
5.5%
Consumer Staples
5.2%
Energy
3.4%
Communication Services
3.0%
Real Estate
1.1%
Utilities
0.4%
[152]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Global Core Plus Real Return Portfolio
Class Name Institutional
Trading Symbol DFAAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Global Core Plus Real Return Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$14
0.29%1,2
[153],[154]
Expenses Paid, Amount $ 14
Expense Ratio, Percent 0.29% [153],[154]
Net Assets $ 306,676,521
Holdings Count | $ / shares 323
Investment Company Portfolio Turnover 26.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$306,676,521
Number of Holdings
323
Portfolio Turnover Rate
26%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top Countries
(% of Total Investments) †
United States
54.8%
Canada
13.0%
France
7.4%
Japan
5.4%
Australia
4.5%
United Kingdom
3.6%
Germany
2.3%
Netherlands
1.1%
Denmark
1.0%
Finland
1.0%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
3.0%
1 to 3 Years
5.7%
3 to 5 Years
9.2%
5 to 10 Years
55.6%
Greater than 10 Years
26.5%
[155]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name DFA Short-Term Selective State Municipal Bond Portfolio
Class Name Institutional
Trading Symbol DFABX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the DFA Short-Term Selective State Municipal Bond Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$12
0.25%1,2
[156],[157]
Expenses Paid, Amount $ 12
Expense Ratio, Percent 0.25% [156],[157]
Net Assets $ 187,763,137
Holdings Count | $ / shares 367
Investment Company Portfolio Turnover 56.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$187,763,137
Number of Holdings
367
Portfolio Turnover Rate
56%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Sector Allocation
(% of Total Investments) †
General Obligation
36.9%
School District
23.6%
Medical
8.7%
General
7.6%
Higher Education
5.5%
Education
4.8%
Water
3.8%
Power
2.9%
Transportation
2.2%
Commercial Paper
1.8%
Utilities
1.4%
Airport
0.5%
Bond Bank
0.3%
Stated Maturity Allocation
(% of Total Investments)
Less than 1 Year
66.2%
1 to 3 Years
20.4%
3 to 5 Years
3.2%
5 to 10 Years
9.1%
Greater than 10 Years
1.1%
[158]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional 2070 Target Date Retirement Income Fund
Class Name Institutional
Trading Symbol DFARX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional 2070 Target Date Retirement Income Fund (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$11
0.21%1,2
[159],[160]
Expenses Paid, Amount $ 11
Expense Ratio, Percent 0.21% [159],[160]
Net Assets $ 1,026,236
Holdings Count | $ / shares 8
Investment Company Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$1,026,236
Number of Holdings
8
Portfolio Turnover Rate
4%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Portfolio Allocation
(% of Total Investments) †
U.S. Core Equity 1 Portfolio
33.5%
U.S. Large Company Portfolio
33.5%
Large Cap International Portfolio
12.3%
Emerging Markets Core Equity 2 Portfolio
9.3%
International Core Equity 2 Portfolio
6.3%
DFA Two-Year Global Fixed Income Portfolio
2.9%
DFA Short-Term Extended Quality Portfolio
2.2%
[161]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
Institutional  
Shareholder Report [Line Items]  
Fund Name Dimensional World ex U.S. Sustainability Targeted Value Portfolio
Class Name Institutional
Trading Symbol DADIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Dimensional World ex U.S. Sustainability Targeted Value Portfolio (the “Portfolio”) for the period of November 1, 2025 to April 30, 2026.
Additional Information [Text Block] You can find additional information about the Portfolio at https://www.dimensional.com/us-en/document-center. You can also request this information at no cost by contacting us collect at (512) 306-7400.
Additional Information Phone Number (512) 306-7400
Additional Information Website https://www.dimensional.com/us-en/document-center
Expenses [Text Block]
WHAT WERE THE Portfolio COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Institutional
$28
0.52%1,2
[162],[163]
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.52% [162],[163]
Net Assets $ 165,538,446
Holdings Count | $ / shares 2,151
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
KEY Portfolio STATISTICS (as of April 30, 2026)
Net Assets
$165,538,446
Number of Holdings
2,151
Portfolio Turnover Rate
13%
Holdings [Text Block]
WHAT DID THE Portfolio INVEST IN? (as of April 30, 2026)
Top 10 Holdings
(% of Total Investments) †
Unimicron Technology Corp.
0.9%
Helvetia Baloise Holding AG
0.6%
Bank of Ireland Group PLC
0.6%
Cie Generale des Etablissements Michelin SCA
0.6%
Magna International, Inc.
0.6%
Julius Baer Group Ltd.
0.6%
Mitsui Kinzoku Co. Ltd.
0.6%
NN Group NV
0.6%
Resonac Holdings Corp.
0.5%
Banco BPM SpA
0.5%
Top Countries
(% of Total Investments) †
Japan
16.2%
China
8.8%
United Kingdom
8.5%
Taiwan
7.3%
Canada
7.1%
Switzerland
6.2%
France
4.8%
South Korea
4.7%
India
4.4%
Australia
4.1%
[164]
Updated Prospectus Web Address https://www.dimensional.com/us-en/document-center
[1]
1 Does not include any fees or charges imposed by the variable insurance contract. If such fees and charges were included, the expenses would be higher.
[2]
2 Annualized
[3]
† Excludes money market funds and collateral for loaned securities, if any.
[4]
1 Does not include any fees or charges imposed by the variable insurance contract. If such fees and charges were included, the expenses would be higher.
[5]
2 Annualized
[6]
† Excludes money market funds and collateral for loaned securities, if any.
[7]
1 Does not include any fees or charges imposed by the variable insurance contract. If such fees and charges were included, the expenses would be higher.
[8]
2 Annualized
[9]
† Excludes money market funds and collateral for loaned securities, if any.
[10]
1 Does not include any fees or charges imposed by the variable insurance contract. If such fees and charges were included, the expenses would be higher.
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2 Annualized
[12]
† Excludes money market funds and collateral for loaned securities, if any.
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1 Annualized
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† Excludes money market funds and collateral for loaned securities, if any.
[15]
1 Does not include any fees or charges imposed by the variable insurance contract. If such fees and charges were included, the expenses would be higher.
[16]
2 Annualized
[17]
† Excludes money market funds and collateral for loaned securities, if any.
[18]
1 Does not include any fees or charges imposed by the variable insurance contract. If such fees and charges were included, the expenses would be higher.
[19]
2 Annualized
[20]
† Excludes money market funds and collateral for loaned securities, if any.
[21]
1 Annualized
[22]
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1 Annualized
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1 Annualized
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1 Annualized
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[29]
1 Annualized
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1 Annualized
[32]
† Excludes money market funds and collateral for loaned securities, if any.
[33]
1 Annualized
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[35]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[36]
2 Annualized
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[38]
1 Annualized
[39]
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[40]
1 Annualized
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1 Annualized
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1 Annualized
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[48]
1 Annualized
[49]
† Excludes money market funds and collateral for loaned securities, if any.
[50]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[51]
2 Does not include any fees or charges imposed by the variable insurance contract. If such fees and charges were included, the expenses would be higher.
[52]
3 Annualized
[53]
† Excludes money market funds, if any.
[54]
1 Annualized
[55]
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[56]
1 Annualized
[57]
† Excludes money market funds and collateral for loaned securities, if any.
[58]
1 Annualized
[59]
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[60]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[61]
2 Annualized
[62]
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[63]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[64]
2 Annualized
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[66]
1 Annualized
[67]
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1 Annualized
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[82]
1 Does not include any fees or charges imposed by the variable insurance contract. If such fees and charges were included, the expenses would be higher.
[83]
2 Annualized
[84]
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[85]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[86]
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[87]
† Excludes money market funds and collateral for loaned securities, if any.
[88]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[89]
2 Annualized
[90]
† Excludes money market funds, if any.
[91]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[92]
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[93]
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[100]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
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2 Annualized
[102]
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[103]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
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2 Annualized
[105]
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1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
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[108]
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[115]
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[117]
1 Annualized
[118]
† Excludes money market funds and collateral for loaned securities, if any.
[119]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[120]
2 Annualized
[121]
† Excludes money market funds, if any.
[122]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[123]
2 Does not include any fees or charges imposed by the variable insurance contract. If such fees and charges were included, the expenses would be higher.
[124]
3 Annualized
[125]
† Excludes money market funds, if any.
[126]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[127]
2 Annualized
[128]
† Excludes money market funds, if any.
[129]
1 Annualized
[130]
† Excludes money market funds, if any.
[131]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[132]
2 Annualized
[133]
† Excludes money market funds and collateral for loaned securities, if any.
[134]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[135]
2 Annualized
[136]
† Excludes money market funds and collateral for loaned securities, if any.
[137]
1 Annualized
[138]
† Excludes money market funds and collateral for loaned securities, if any.
[139]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[140]
2 Annualized
[141]
† Excludes money market funds, if any.
[142]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[143]
2 Annualized
[144]
† Excludes money market funds, if any.
[145]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[146]
2 Annualized
[147]
† Excludes money market funds, if any.
[148]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[149]
2 Annualized
[150]
† Excludes money market funds, if any.
[151]
1 Annualized
[152]
† Excludes money market funds and collateral for loaned securities, if any.
[153]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[154]
2 Annualized
[155]
† Excludes money market funds and collateral for loaned securities, if any.
[156]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[157]
2 Annualized
[158]
† Excludes money market funds, if any.
[159]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[160]
2 Annualized
[161]
† Excludes money market funds, if any.
[162]
1 Reflects Fee Waivers and/or Expense Assumptions, without which expenses would have been higher.
[163]
2 Annualized
[164]
† Excludes money market funds and collateral for loaned securities, if any.