<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>1657</ContextCount>
  <ElementCount>36</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>92</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>3</UnitCount>
  <MyReports>
    <Report instance="d97567dncsr.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="d97567dncsr.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="d97567dncsr.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="d97567dncsr.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="d97567dncsr.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>cik0000893818-20260225.xsd</File>
    <File doctype="N-CSR" isDefinitelyNotFs="true" isNcsr="true" isOEF="true" isRRorOEF="true" isUsgaap="true" original="d97567dncsr.htm">d97567dncsr.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>g97567chartimages_6658470.jpg</File>
    <File>g97567chartimages_6658523.jpg</File>
    <File>g97567chartimages_6658536.jpg</File>
    <File>g97567chartimages_6658589.jpg</File>
    <File>g97567chartimages_6658602.jpg</File>
    <File>g97567chartimages_6658666.jpg</File>
    <File>g97567chartimages_6658667.jpg</File>
    <File>g97567chartimages_6658730.jpg</File>
    <File>g97567chartimages_6658743.jpg</File>
    <File>g97567chartimages_6658794.jpg</File>
    <File>g97567chartimages_6658807.jpg</File>
    <File>g97567chartimages_6658860.jpg</File>
    <File>g97567chartimages_6658873.jpg</File>
    <File>g97567chartimages_6658926.jpg</File>
    <File>g97567chartimages_6658939.jpg</File>
    <File>g97567chartimages_6658992.jpg</File>
    <File>g97567chartimages_6659005.jpg</File>
    <File>g97567chartimages_6659058.jpg</File>
    <File>g97567chartimages_6659071.jpg</File>
    <File>g97567chartimages_6659124.jpg</File>
    <File>g97567chartimages_6659137.jpg</File>
    <File>g97567chartimages_6659200.jpg</File>
    <File>g97567chartimages_6659201.jpg</File>
    <File>g97567chartimages_6659264.jpg</File>
    <File>g97567chartimages_6659277.jpg</File>
    <File>g97567chartimages_6659328.jpg</File>
    <File>g97567chartimages_6659341.jpg</File>
    <File>g97567chartimages_6659404.jpg</File>
    <File>g97567chartimages_6659405.jpg</File>
    <File>g97567chartimages_6659468.jpg</File>
    <File>g97567chartimages_6659481.jpg</File>
    <File>g97567chartimages_6659532.jpg</File>
    <File>g97567chartimages_6659545.jpg</File>
    <File>g97567chartimages_6659608.jpg</File>
    <File>g97567chartimages_6659609.jpg</File>
    <File>g97567chartimages_6659672.jpg</File>
    <File>g97567chartimages_6659685.jpg</File>
    <File>g97567chartimages_6659736.jpg</File>
    <File>g97567chartimages_6659749.jpg</File>
    <File>g97567chartimages_6659812.jpg</File>
    <File>g97567chartimages_6659813.jpg</File>
    <File>g97567chartimages_6659876.jpg</File>
    <File>g97567chartimages_6659889.jpg</File>
    <File>g97567chartimages_6659940.jpg</File>
    <File>g97567chartimages_6659953.jpg</File>
    <File>g97567chartimages_6660016.jpg</File>
    <File>g97567chartimages_6660017.jpg</File>
    <File>g97567chartimages_6660080.jpg</File>
    <File>g97567chartimages_6660093.jpg</File>
    <File>g97567chartimages_6660144.jpg</File>
    <File>g97567images_5649.jpg</File>
    <File>g97567images_5650.jpg</File>
    <File>g97567img5917c9872.jpg</File>
    <File>g97567imgd1248f8d1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="100">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="56">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="3357">http://xbrl.sec.gov/oef/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
