<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>1029</ContextCount>
  <ElementCount>35</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>127</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>3</UnitCount>
  <MyReports>
    <Report instance="equityseries_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="equityseries_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="equityseries_ncsrs.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="equityseries_ncsrs.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="equityseries_ncsrs.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 doctype="N-CSRS" isDefinitelyNotFs="true" isNcsr="true" isOEF="true" isRRorOEF="true" isUsgaap="true" original="equityseries_ncsrs.htm">equityseries_ncsrs.htm</File>
    <File>gabelli-20260331.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>geif_001.jpg</File>
    <File>gfgif_001.jpg</File>
    <File>gfgif_002.jpg</File>
    <File>ggfsf_001.jpg</File>
    <File>ggfsf_002.jpg</File>
    <File>gscgf_001.jpg</File>
    <File>i0ce8eb2a615f7f7379afc785.jpg</File>
    <File>i115de64a741a2ec3b887d714.jpg</File>
    <File>i1829a71e082eeb32c572c6e5.jpg</File>
    <File>i1edb6382a41a83c48e18d6df.jpg</File>
    <File>i2bebba21325ae00d4d0857fd.jpg</File>
    <File>i330e7f9a94bdbda50e58ec8f.jpg</File>
    <File>i333c0169e2b4bb78d517de8a.jpg</File>
    <File>i3d6477a134072d6728f96c68.jpg</File>
    <File>i4a5f14b16dbf487089c990b4.jpg</File>
    <File>i60f1f18c283fdc0a68512939.jpg</File>
    <File>i6116866b506586c6e4b4d10b.jpg</File>
    <File>i71c1316bac11de6e3db79198.jpg</File>
    <File>i78dcc8b2048724ebb3aeaeb2.jpg</File>
    <File>i97cc8ad5fa027883022a16f2.jpg</File>
    <File>ib96b62cbc25e75238df6a41a.jpg</File>
    <File>id816f4695786c86ee6352990.jpg</File>
    <File>id917fe5f52883432be0a038d.jpg</File>
    <File>ide84e4ef1c1ab1bc18b3d9d9.jpg</File>
    <File>if2fb9c5c0ffa441dfa228a71.jpg</File>
    <File>ifde133edcbb6593a16f1fb6c.jpg</File>
    <File>iff3a7f4ed9994ec1a554d8ac.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="32">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="54">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="1416">http://xbrl.sec.gov/oef/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
