<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.19.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>64</ContextCount>
  <ElementCount>90</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>30</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000000 - Document - Document and Entity Information {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DocumentDocumentandEntityInformationElements</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory></MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>000011 - Document - Risk/Return Summary {Unlabeled} - Vanguard Tax-Managed Balanced Fund (Retail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DocumentRiskReturnSummaryUnlabeledVanguardTax-ManagedBalancedFundRetail</Role>
      <ShortName>Risk/Return Summary- Vanguard Tax-Managed Balanced Fund (Retail)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>000019 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Tax-Managed Balanced Fund (Retail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTax-ManagedBalancedFundRetail</Role>
      <ShortName>Risk/Return Detail Data- Vanguard Tax-Managed Balanced Fund (Retail)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>000021 - Document - Risk/Return Summary {Unlabeled} - Vanguard Tax-Managed Capital Appreciation Fund (Retail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DocumentRiskReturnSummaryUnlabeledVanguardTax-ManagedCapitalAppreciationFundRetail</Role>
      <ShortName>Risk/Return Summary- Vanguard Tax-Managed Capital Appreciation Fund (Retail)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>000029 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Tax-Managed Capital Appreciation Fund (Retail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTax-ManagedCapitalAppreciationFundRetail</Role>
      <ShortName>Risk/Return Detail Data- Vanguard Tax-Managed Capital Appreciation Fund (Retail)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>000031 - Document - Risk/Return Summary {Unlabeled} - Vanguard Tax-Managed Small-Cap Fund (Retail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DocumentRiskReturnSummaryUnlabeledVanguardTax-ManagedSmall-CapFundRetail</Role>
      <ShortName>Risk/Return Summary- Vanguard Tax-Managed Small-Cap Fund (Retail)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>000039 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Tax-Managed Small-Cap Fund (Retail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTax-ManagedSmall-CapFundRetail</Role>
      <ShortName>Risk/Return Detail Data- Vanguard Tax-Managed Small-Cap Fund (Retail)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>000041 - Document - Risk/Return Summary {Unlabeled} - Vanguard Tax-Managed Capital Appreciation Fund (Institutional)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DocumentRiskReturnSummaryUnlabeledVanguardTax-ManagedCapitalAppreciationFundInstitutional</Role>
      <ShortName>Risk/Return Summary- Vanguard Tax-Managed Capital Appreciation Fund (Institutional)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>000049 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Tax-Managed Capital Appreciation Fund (Institutional)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTax-ManagedCapitalAppreciationFundInstitutional</Role>
      <ShortName>Risk/Return Detail Data- Vanguard Tax-Managed Capital Appreciation Fund (Institutional)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>000051 - Document - Risk/Return Summary {Unlabeled} - Vanguard Tax-Managed Small-Cap Fund (Institutional)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DocumentRiskReturnSummaryUnlabeledVanguardTax-ManagedSmall-CapFundInstitutional</Role>
      <ShortName>Risk/Return Summary- Vanguard Tax-Managed Small-Cap Fund (Institutional)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>000059 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Tax-Managed Small-Cap Fund (Institutional)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardTax-ManagedSmall-CapFundInstitutional</Role>
      <ShortName>Risk/Return Detail Data- Vanguard Tax-Managed Small-Cap Fund (Institutional)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>000061 - Document - Risk/Return Summary {Unlabeled} - Vanguard Developed Markets Index Fund (Retail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DocumentRiskReturnSummaryUnlabeledVanguardDevelopedMarketsIndexFundRetail</Role>
      <ShortName>Risk/Return Summary- Vanguard Developed Markets Index Fund (Retail)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>000069 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Developed Markets Index Fund (Retail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardDevelopedMarketsIndexFundRetail</Role>
      <ShortName>Risk/Return Detail Data- Vanguard Developed Markets Index Fund (Retail)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>000071 - Document - Risk/Return Summary {Unlabeled} - Vanguard Developed Markets Index Fund (ETF)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DocumentRiskReturnSummaryUnlabeledVanguardDevelopedMarketsIndexFundETF</Role>
      <ShortName>Risk/Return Summary- Vanguard Developed Markets Index Fund (ETF)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>000079 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Developed Markets Index Fund (ETF)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardDevelopedMarketsIndexFundETF</Role>
      <ShortName>Risk/Return Detail Data- Vanguard Developed Markets Index Fund (ETF)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>000081 - Document - Risk/Return Summary {Unlabeled} - Vanguard Developed Markets Index Fund (Institutional)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DocumentRiskReturnSummaryUnlabeledVanguardDevelopedMarketsIndexFundInstitutional</Role>
      <ShortName>Risk/Return Summary- Vanguard Developed Markets Index Fund (Institutional)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>000089 - Disclosure - Risk/Return Detail Data {Elements} - Vanguard Developed Markets Index Fund (Institutional)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vanguard.com/role/DisclosureRiskReturnDetailDataElementsVanguardDevelopedMarketsIndexFundInstitutional</Role>
      <ShortName>Risk/Return Detail Data- Vanguard Developed Markets Index Fund (Institutional)</ShortName>
      <MenuCategory></MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="taxmanaged-20190426.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>040000 - Disclosure - Risk/Return Detail Data {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/RiskReturnDetailData</Role>
      <ShortName>Risk/Return Detail Data</ShortName>
      <MenuCategory></MenuCategory>
      <Position>18</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>taxmanaged-20190426.xml</File>
    <File>taxmanaged-20190426.xsd</File>
    <File>taxmanaged-20190426_cal.xml</File>
    <File>taxmanaged-20190426_def.xml</File>
    <File>taxmanaged-20190426_lab.xml</File>
    <File>taxmanaged-20190426_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>BarChart1.png</File>
    <File>BarChart2.png</File>
    <File>BarChart3.png</File>
    <File>BarChart4.png</File>
    <File>BarChart5.png</File>
    <File>BarChart6.png</File>
    <File>BarChart7.png</File>
    <File>BarChart8.png</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2018-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/rr/2018-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
