<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>93</ContextCount>
  <ElementCount>89</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>45</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="d871679d485bpos.htm">
      <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.johnhancock.com/role/DocumentDocumentandEntityInformationElements</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="d871679d485bpos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>000019 - Disclosure - Risk/Return Detail Data {Elements} - Fundamental All Cap Core Fund (Class A C I R2 R4 R6)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.johnhancock.com/role/DisclosureRiskReturnDetailDataElementsFundamentalAllCapCoreFundClassACIR2R4R6</Role>
      <ShortName>Risk/Return Detail Data- Fundamental All Cap Core Fund (Class A C I R2 R4 R6)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="d871679d485bpos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>000029 - Disclosure - Risk/Return Detail Data {Elements} - Multi-Asset Absolute Return Fund (Class A C I R2 R6)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.johnhancock.com/role/DisclosureRiskReturnDetailDataElementsMulti-AssetAbsoluteReturnFundClassACIR2R6</Role>
      <ShortName>Risk/Return Detail Data- Multi-Asset Absolute Return Fund (Class A C I R2 R6)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="d871679d485bpos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>000039 - Disclosure - Risk/Return Detail Data {Elements} - Multi-Asset Absolute Return Fund (Class NAV)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.johnhancock.com/role/DisclosureRiskReturnDetailDataElementsMulti-AssetAbsoluteReturnFundClassNAV</Role>
      <ShortName>Risk/Return Detail Data- Multi-Asset Absolute Return Fund (Class NAV)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="d871679d485bpos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.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>Risk/Return</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 doctype="485BPOS" isN1a="true" isRR="true" isRRorOEF="true" original="d871679d485bpos.htm">d871679d485bpos.htm</File>
    <File>jhf-20241122.xsd</File>
    <File>jhf-20241122_cal.xml</File>
    <File>jhf-20241122_def.xml</File>
    <File>jhf-20241122_lab.xml</File>
    <File>jhf-20241122_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>g466944dsp001a.jpg</File>
    <File>g466944dsp053.jpg</File>
    <File>g466944dsp081.jpg</File>
    <File>g466944dsp88.jpg</File>
    <File>g466944g0626232836372.jpg</File>
    <File>g466944stamp001.jpg</File>
    <File>g482199orgchart.jpg</File>
    <File>g487418jhim_blk.jpg</File>
    <File>g487418mim_blk.gif</File>
    <File>g487418moodysglobal.jpg</File>
    <File>g871679facc_8.jpg</File>
    <File>g871679gears_3.jpg</File>
    <File>g871679img0d68dd821.jpg</File>
    <File>g871679img2e1d62332.jpg</File>
    <File>g871679img41a71f692.jpg</File>
    <File>g871679img5b44aad63.jpg</File>
    <File>g871679img6f3235763.jpg</File>
    <File>g871679img84e9227d2.jpg</File>
    <File>g871679imgb027747c1.jpg</File>
    <File>g871679imgca7106751.jpg</File>
    <File>g871679jhim_blk.gif</File>
    <File>g871679leaf_3.jpg</File>
    <File>g871679mim_blk.gif</File>
    <File>g871679paperlesslogo_1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="19">http://xbrl.sec.gov/dei/2023</BaseTaxonomy>
    <BaseTaxonomy items="465">http://xbrl.sec.gov/rr/2023</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
