<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>15003</ContextCount>
  <ElementCount>36</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>545</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>3</UnitCount>
  <MyReports>
    <Report instance="primary-document.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="primary-document.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="primary-document.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>040010 - Disclosure - Shareholder Report, Line Graph (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails</Role>
      <ShortName>Shareholder Report, Line Graph (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="primary-document.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>040015 - Disclosure - Shareholder Report, Average Annual Return (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails</Role>
      <ShortName>Shareholder Report, Average Annual Return (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="primary-document.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>040020 - Disclosure - Shareholder Report, Holdings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails</Role>
      <ShortName>Shareholder Report, Holdings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>blk-20260331.xsd</File>
    <File doctype="N-CSR" isDefinitelyNotFs="true" isNcsr="true" isOEF="true" isRRorOEF="true" isUsgaap="true" original="primary-document.htm">primary-document.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>i040e343168a6f28b30ccb500.jpg</File>
    <File>i0a39d52cd5e12fbf34551a92.jpg</File>
    <File>i0a3d9525ba26fe5c4c7ec677.jpg</File>
    <File>i0b4887e3f569ad8ea9695364.jpg</File>
    <File>i15a87901aa70fc491a7b24b9.jpg</File>
    <File>i1ddd5b24579908285e76745a.jpg</File>
    <File>i1eb7e871582720572a679754.jpg</File>
    <File>i23e4e16d312119921cc87162.jpg</File>
    <File>i2bc069a903619cabbfc0b0be.jpg</File>
    <File>i2cbe792a3fe78ac9bac26788.jpg</File>
    <File>i3f37e22177d294eb33140d0c.jpg</File>
    <File>i459ecb41b45d0c4f8e2b8d04.jpg</File>
    <File>i49e0435af1ef8c1245c18b1c.jpg</File>
    <File>i4e7e296e32888bfbb2f2ea03.jpg</File>
    <File>i5502c020b973fb11b7ca7417.jpg</File>
    <File>i5f9a5281d22e35e223fe6de1.jpg</File>
    <File>i648b4ea30d25bbc53cda3f16.jpg</File>
    <File>i6c3c2f252952d911a2534d8c.jpg</File>
    <File>i6e56ec916cd6ded16429253d.jpg</File>
    <File>i71e39b4c467e6b845637f862.jpg</File>
    <File>i742d5eb0db086c8fba31db79.jpg</File>
    <File>i77dc0c09357670620fbc53e8.jpg</File>
    <File>i7d731854dec8fbdf7e75687f.jpg</File>
    <File>i7ef3cf85f7f4b1271513dd6f.jpg</File>
    <File>i80002e2fb3467c70f27d6ae0.jpg</File>
    <File>i804cbd12c1a9bfe964bf25eb.jpg</File>
    <File>i873e3f03067d47cab3951063.jpg</File>
    <File>i8cb214fe1846033a8cb0230e.jpg</File>
    <File>i927835a41e9c11bb492c68ce.jpg</File>
    <File>i94245c6aa76d80c1b8177f4d.jpg</File>
    <File>i9454bee52ab1721184637244.jpg</File>
    <File>i98cb5e57102a80e0a78afef3.jpg</File>
    <File>i9b9b8057360702b9674f3a8d.jpg</File>
    <File>i9eedf0ef98381a64728712ff.jpg</File>
    <File>ia9548918531eac74559c7677.jpg</File>
    <File>ibf80850a41ac3829f987c089.jpg</File>
    <File>ic07f22b449e381c1ff748486.jpg</File>
    <File>ic1627e3a6e7d8011cfa18e27.jpg</File>
    <File>ic1a6b051ceaf016fa0f9fa85.jpg</File>
    <File>ic565a55a453d32ed65046f8a.jpg</File>
    <File>id074b6891348524a5bb8b137.jpg</File>
    <File>id1ddcbd9d4e32da88370afdb.jpg</File>
    <File>id81d84ce422727e0d8370733.jpg</File>
    <File>ida2c5cb43c3fa77db8b8a3e5.jpg</File>
    <File>idafd11799ab52e656cdfa880.jpg</File>
    <File>idfec617bac430dad6a6c0dc0.jpg</File>
    <File>iea9558a2e5eb1b0e6d89717d.jpg</File>
    <File>ieda73d0f577d1dfcc511c330.jpg</File>
    <File>if4061cee1844f47aee9a90d0.jpg</File>
    <File>ifc63f6f4ec2cc0cb7bcc328c.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="92">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="144">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="16030">http://xbrl.sec.gov/oef/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
