<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>989</ContextCount>
  <ElementCount>25</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>767</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>3</UnitCount>
  <MyReports>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>030000 - Disclosure - Form N-CSR Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/oef/role/NcsrCover</Role>
      <ShortName>Form N-CSR Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>030001 - Disclosure - Shareholder Report</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/oef/role/ShareholderReport</Role>
      <ShortName>Shareholder Report</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>040016 - Document - Shareholder Report, Holdings (Details) DFDR_Dimensional VA International Small Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_1</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFDR_Dimensional VA International Small Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>040020 - Document - Shareholder Report, Holdings (Details) DFD3_Dimensional VA International Value Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_2</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFD3_Dimensional VA International Value Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>040024 - Document - Shareholder Report, Holdings (Details) DFC9_Dimensional VA U.S. Targeted Value Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_3</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFC9_Dimensional VA U.S. Targeted Value Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>040028 - Document - Shareholder Report, Holdings (Details) DFD1_Dimensional VA Short-Term Fixed Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_4</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFD1_Dimensional VA Short-Term Fixed Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>040032 - Document - Shareholder Report, Holdings (Details) DFCM_DFA Two-Year Global Fixed Income Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_5</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFCM_DFA Two-Year Global Fixed Income Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>040036 - Document - Shareholder Report, Holdings (Details) DFD2_Dimensional VA U.S. Large Value Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_6</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFD2_Dimensional VA U.S. Large Value Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>040040 - Document - Shareholder Report, Holdings (Details) DFD4_Dimensional VA Global Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_7</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFD4_Dimensional VA Global Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>040044 - Document - Shareholder Report, Holdings (Details) DFBW_DFA One-Year Fixed Income Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_8</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFBW_DFA One-Year Fixed Income Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>040048 - Document - Shareholder Report, Holdings (Details) DFCY_DFA Five-Year Global Fixed Income Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_9</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFCY_DFA Five-Year Global Fixed Income Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>040052 - Document - Shareholder Report, Holdings (Details) DFDE_DFA Short-Term Municipal Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_10</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFDE_DFA Short-Term Municipal Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>040056 - Document - Shareholder Report, Holdings (Details) DFBZ_DFA Short-Term Government Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_11</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFBZ_DFA Short-Term Government Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>040060 - Document - Shareholder Report, Holdings (Details) DFB1_DFA Intermediate Government Fixed Income Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_12</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFB1_DFA Intermediate Government Fixed Income Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>040064 - Document - Shareholder Report, Holdings (Details) DFDS_Emerging Markets Social Core Equity Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_13</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFDS_Emerging Markets Social Core Equity Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>040068 - Document - Shareholder Report, Holdings (Details) DFB2_DFA Inflation-Protected Securities Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_14</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFB2_DFA Inflation-Protected Securities Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>040072 - Document - Shareholder Report, Holdings (Details) DFC7_DFA California Short-Term Municipal Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_15</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFC7_DFA California Short-Term Municipal Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>040076 - Document - Shareholder Report, Holdings (Details) DFDM_U.S. Social Core Equity 2 Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_16</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFDM_U.S. Social Core Equity 2 Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>040080 - Document - Shareholder Report, Holdings (Details) DFC0_DFA Selectively Hedged Global Fixed Income Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_17</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFC0_DFA Selectively Hedged Global Fixed Income Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>040084 - Document - Shareholder Report, Holdings (Details) DFDN_U.S. Sustainability Core 1 Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_18</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFDN_U.S. Sustainability Core 1 Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>040088 - Document - Shareholder Report, Holdings (Details) DFDU_International Sustainability Core 1 Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_19</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFDU_International Sustainability Core 1 Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>040092 - Document - Shareholder Report, Holdings (Details) DFB8_DFA Short-Term Extended Quality Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_20</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFB8_DFA Short-Term Extended Quality Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>040096 - Document - Shareholder Report, Holdings (Details) DFB9_DFA Intermediate-Term Extended Quality Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_21</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFB9_DFA Intermediate-Term Extended Quality Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>040100 - Document - Shareholder Report, Holdings (Details) DFEH_Dimensional VA Global Moderate Allocation Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_22</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFEH_Dimensional VA Global Moderate Allocation Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>040104 - Document - Shareholder Report, Holdings (Details) DFC6_DFA California Intermediate-Term Municipal Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_23</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFC6_DFA California Intermediate-Term Municipal Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>040108 - Document - Shareholder Report, Holdings (Details) DFBG_DFA Investment Grade Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_24</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFBG_DFA Investment Grade Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>040112 - Document - Shareholder Report, Holdings (Details) DFB5_DFA LTIP Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_25</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFB5_DFA LTIP Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>040116 - Document - Shareholder Report, Holdings (Details) DFC1_DFA International Government Fixed Income Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_26</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFC1_DFA International Government Fixed Income Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>040120 - Document - Shareholder Report, Holdings (Details) DFC8_DFA Intermediate-Term Municipal Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_27</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFC8_DFA Intermediate-Term Municipal Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>040124 - Document - Shareholder Report, Holdings (Details) DFDX_International Social Core Equity Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_28</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFDX_International Social Core Equity Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>040128 - Document - Shareholder Report, Holdings (Details) DFEB_U.S. Large Cap Growth Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_29</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFEB_U.S. Large Cap Growth Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>040132 - Document - Shareholder Report, Holdings (Details) DFED_U.S. Small Cap Growth Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_30</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFED_U.S. Small Cap Growth Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>040136 - Document - Shareholder Report, Holdings (Details) DFEF_International Large Cap Growth Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_31</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFEF_International Large Cap Growth Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>040140 - Document - Shareholder Report, Holdings (Details) DFEG_International Small Cap Growth Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_32</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFEG_International Small Cap Growth Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>040144 - Document - Shareholder Report, Holdings (Details) DFFI_DFA Short-Duration Real Return Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_33</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFFI_DFA Short-Duration Real Return Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>040148 - Document - Shareholder Report, Holdings (Details) DFFJ_DFA Municipal Real Return Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_34</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFFJ_DFA Municipal Real Return Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>040152 - Document - Shareholder Report, Holdings (Details) DFFL_DFA Municipal Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_35</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFFL_DFA Municipal Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>040156 - Document - Shareholder Report, Holdings (Details) DFFM_Dimensional VIT Inflation-Protected Securities Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_36</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFFM_Dimensional VIT Inflation-Protected Securities Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>040160 - Document - Shareholder Report, Holdings (Details) DFFP_DFA Targeted Credit Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_37</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFFP_DFA Targeted Credit Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>040164 - Document - Shareholder Report, Holdings (Details) DFFN_DFA NY Municipal Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_38</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFFN_DFA NY Municipal Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>040168 - Document - Shareholder Report, Holdings (Details) DFGA_Dimensional Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_39</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGA_Dimensional Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>040172 - Document - Shareholder Report, Holdings (Details) DFGM_Dimensional 2045 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_40</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGM_Dimensional 2045 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>040176 - Document - Shareholder Report, Holdings (Details) DFGN_Dimensional 2050 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_41</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGN_Dimensional 2050 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>040180 - Document - Shareholder Report, Holdings (Details) DFGP_Dimensional 2055 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_42</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGP_Dimensional 2055 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>040184 - Document - Shareholder Report, Holdings (Details) DFGQ_Dimensional 2060 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_43</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGQ_Dimensional 2060 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>040188 - Document - Shareholder Report, Holdings (Details) DFGE_Dimensional 2015 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_44</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGE_Dimensional 2015 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>040192 - Document - Shareholder Report, Holdings (Details) DFGF_Dimensional 2020 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_45</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGF_Dimensional 2020 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>040196 - Document - Shareholder Report, Holdings (Details) DFGH_Dimensional 2025 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_46</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGH_Dimensional 2025 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>040200 - Document - Shareholder Report, Holdings (Details) DFGI_Dimensional 2030 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_47</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGI_Dimensional 2030 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>040204 - Document - Shareholder Report, Holdings (Details) DFGJ_Dimensional 2035 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_48</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGJ_Dimensional 2035 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>040208 - Document - Shareholder Report, Holdings (Details) DFGL_Dimensional 2040 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_49</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFGL_Dimensional 2040 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>040212 - Document - Shareholder Report, Holdings (Details) DFFQ_DFA Social Fixed Income Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_50</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFFQ_DFA Social Fixed Income Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>040216 - Document - Shareholder Report, Holdings (Details) DFFR_DFA Diversified Fixed Income Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_51</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFFR_DFA Diversified Fixed Income Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>040220 - Document - Shareholder Report, Holdings (Details) DFFY_Dimensional VA Equity Allocation Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_52</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFFY_Dimensional VA Equity Allocation Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>040224 - Document - Shareholder Report, Holdings (Details) DFFZ_DFA MN Municipal Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_53</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFFZ_DFA MN Municipal Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>040228 - Document - Shareholder Report, Holdings (Details) DFF4_DFA California Municipal Real Return Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_54</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFF4_DFA California Municipal Real Return Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>040232 - Document - Shareholder Report, Holdings (Details) DFHA_DFA Global Core Plus Fixed Income Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_55</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHA_DFA Global Core Plus Fixed Income Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>040236 - Document - Shareholder Report, Holdings (Details) DFHB_Emerging Markets Sustainability Core 1 Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_56</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHB_Emerging Markets Sustainability Core 1 Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>040240 - Document - Shareholder Report, Holdings (Details) DFHE_DFA Global Sustainability Fixed Income Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_57</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHE_DFA Global Sustainability Fixed Income Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>040244 - Document - Shareholder Report, Holdings (Details) DFHG_DFA Oregon Municipal Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_58</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHG_DFA Oregon Municipal Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>040248 - Document - Shareholder Report, Holdings (Details) DFHI_DFA Selective State Municipal Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_59</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHI_DFA Selective State Municipal Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>040252 - Document - Shareholder Report, Holdings (Details) DFHJ_Global Social Core Equity Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_60</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHJ_Global Social Core Equity Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>040256 - Document - Shareholder Report, Holdings (Details) DFHL_Dimensional 2065 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_61</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHL_Dimensional 2065 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>040260 - Document - Shareholder Report, Holdings (Details) DFHM_U.S. Sustainability Targeted Value Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_62</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHM_U.S. Sustainability Targeted Value Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>040264 - Document - Shareholder Report, Holdings (Details) DFHN_DFA Global Core Plus Real Return Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_63</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHN_DFA Global Core Plus Real Return Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>040268 - Document - Shareholder Report, Holdings (Details) DFHW_DFA Short-Term Selective State Municipal Bond Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_64</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHW_DFA Short-Term Selective State Municipal Bond Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>040272 - Document - Shareholder Report, Holdings (Details) DFHZ_Dimensional 2070 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_65</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHZ_Dimensional 2070 Target Date Retirement Income Fund_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="bdidgi-efp25666_ncsrs.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>040276 - Document - Shareholder Report, Holdings (Details) DFHX_Dimensional World ex U.S. Sustainability Targeted Value Portfolio_Institutional_TSR SemiAnnual {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tsr/role/ShareholderReportHoldingsDetails_66</Role>
      <ShortName>Shareholder Report, Holdings (Details) DFHX_Dimensional World ex U.S. Sustainability Targeted Value Portfolio_Institutional_TSR SemiAnnual</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="N-CSRS" isDefinitelyNotFs="true" isNcsr="true" isOEF="true" isRRorOEF="true" isUsgaap="true" original="bdidgi-efp25666_ncsrs.htm">bdidgi-efp25666_ncsrs.htm</File>
    <File>tsr-20260430.xsd</File>
    <File>tsr-20260430_def.xml</File>
    <File>tsr-20260430_lab.xml</File>
    <File>tsr-20260430_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img05e75e3a2.jpg</File>
    <File>img131d1ac72.jpg</File>
    <File>img141882_202410280931781.jpg</File>
    <File>img141883_202410280932496.jpg</File>
    <File>img1956a8492.jpg</File>
    <File>img4065ebf42.jpg</File>
    <File>img4aff95e62.jpg</File>
    <File>img4e1d48241.gif</File>
    <File>img572295a51.gif</File>
    <File>img70980c481.gif</File>
    <File>imga763e4c82.jpg</File>
    <File>imgacbe9dcc1.gif</File>
    <File>imgc90770931.gif</File>
    <File>imgd6c6d7b41.gif</File>
    <File>imge6d26e5b2.jpg</File>
    <File>imgf5cade3f1.gif</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="132">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="138">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="1781">http://xbrl.sec.gov/oef/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
