<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>13</ContextCount>
  <ElementCount>86</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>12</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="fxisi-form.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.FederatedInvestors.com/role/DocumentDocumentandEntityInformationElements</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory></MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="fxisi-form.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>000019 - Disclosure - Risk/Return Detail Data {Elements} - Federated Hermes Strategic Income Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.FederatedInvestors.com/role/DisclosureRiskReturnDetailDataElementsFederatedHermesStrategicIncomeFund</Role>
      <ShortName>Risk/Return Detail Data- Federated Hermes Strategic Income Fund</ShortName>
      <MenuCategory></MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="fxisi-form.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.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>3</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Warning">[ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 51 fact(s) appearing in ix:hidden were eligible for transformation: rr:ExpenseExampleNoRedemptionYear01, rr:ExpenseExampleNoRedemptionYear03, rr:ExpenseExampleNoRedemptionYear05, rr:ExpenseExampleNoRedemptionYear10, rr:ExpenseExampleYear01, rr:ExpenseExampleYear03, rr:ExpenseExampleYear05, rr:ExpenseExampleYear10, rr:HighestQuarterlyReturnLabel, rr:LowestQuarterlyReturnLabel, rr:ProspectusDate -  fxisi-form.htm 14, 23, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74</Log>
  </Logs>
  <InputFiles>
    <File doctype="485BPOS" original="fxisi-form.htm">fxisi-form.htm</File>
    <File>exhibit28-e1.htm</File>
    <File>exhibit28-g1.htm</File>
    <File>exhibit28-g2.htm</File>
    <File>exhibit28-h1a.htm</File>
    <File>exhibit28-h1b.htm</File>
    <File>exhibit28-h2.htm</File>
    <File>exhibit28-h3.htm</File>
    <File>exhibit28-h4a.htm</File>
    <File>exhibit28-h4b.htm</File>
    <File>exhibit28-h5a.htm</File>
    <File>exhibit28-h5b.htm</File>
    <File>exhibit28-h5c.htm</File>
    <File>exhibit28-j2.htm</File>
    <File>exhibit28-n.htm</File>
    <File>fhfisi-20230126.xsd</File>
    <File>fhfisi-20230126_cal.xml</File>
    <File>fhfisi-20230126_def.xml</File>
    <File>fhfisi-20230126_lab.xml</File>
    <File>fhfisi-20230126_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>fhilogok11p_2.jpg</File>
    <File>img701cc0771.gif</File>
    <File>imgeff1b9541.gif</File>
    <File>sifpro28089_6.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="14">http://xbrl.sec.gov/dei/2021</BaseTaxonomy>
    <BaseTaxonomy items="211">http://xbrl.sec.gov/rr/2021</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
