<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>477</ContextCount>
  <ElementCount>455</ElementCount>
  <EntityCount>2</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>106</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Condensed Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ConsolidatedBalanceSheet</Role>
      <ShortName>Condensed Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Condensed Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ConsolidatedBalanceSheet_Parentheticals</Role>
      <ShortName>Condensed Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Unaudited Condensed Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ConsolidatedIncomeStatement</Role>
      <ShortName>Unaudited Condensed Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Unaudited Condensed Statements of Stockholders' Deficit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ShareholdersEquityType2or3</Role>
      <ShortName>Unaudited Condensed Statements of Stockholders' Deficit</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Unaudited Condensed Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ConsolidatedCashFlow</Role>
      <ShortName>Unaudited Condensed Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Disclosure - Organization and Description of Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/OrganizationandDescriptionofBusiness</Role>
      <ShortName>Organization and Description of Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/SummaryofSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Retrospective Adjustments to Company Stock</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/RetrospectiveAdjustmentstoCompanyStock</Role>
      <ShortName>Retrospective Adjustments to Company Stock</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Property and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/PropertyandEquipment</Role>
      <ShortName>Property and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/IntangibleAssets</Role>
      <ShortName>Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Stockholders’ Deficit and Mezzanine Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/StockholdersDeficitandMezzanineEquity</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Related Parties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/RelatedParties</Role>
      <ShortName>Related Parties</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Disaggregation of Revenues</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/DisaggregationofRevenues</Role>
      <ShortName>Disaggregation of Revenues</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Segment Reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/SegmentReporting</Role>
      <ShortName>Segment Reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>996000 - Disclosure - Accounting Policies, by Policy (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/AccountingPoliciesByPolicy</Role>
      <ShortName>Accounting Policies, by Policy (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.freecast.com/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>996001 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/SummaryofSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.freecast.com/role/SummaryofSignificantAccountingPolicies</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>996002 - Disclosure - Property and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/PropertyandEquipmentTables</Role>
      <ShortName>Property and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.freecast.com/role/PropertyandEquipment</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>996003 - Disclosure - Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/IntangibleAssetsTables</Role>
      <ShortName>Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.freecast.com/role/IntangibleAssets</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>996004 - Disclosure - Stockholders’ Deficit and Mezzanine Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/StockholdersDeficitandMezzanineEquityTables</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.freecast.com/role/StockholdersDeficitandMezzanineEquity</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>996005 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.freecast.com/role/Leases</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>996006 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.freecast.com/role/IncomeTaxes</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>996007 - Disclosure - Disaggregation of Revenues (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/DisaggregationofRevenuesTables</Role>
      <ShortName>Disaggregation of Revenues (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.freecast.com/role/DisaggregationofRevenues</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>996008 - Disclosure - Organization and Description of Business (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/OrganizationandDescriptionofBusinessDetails</Role>
      <ShortName>Organization and Description of Business (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/OrganizationandDescriptionofBusiness</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>996009 - Disclosure - Summary of Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/SummaryofSignificantAccountingPoliciesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/SummaryofSignificantAccountingPoliciesTables</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>996010 - Disclosure - Summary of Significant Accounting Policies - Schedule of the Estimated Transaction Price (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleoftheEstimatedTransactionPriceTable</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of the Estimated Transaction Price (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>996011 - Disclosure - Summary of Significant Accounting Policies - Schedule of Class a Common Stock Effects are Anti-Dilutive (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofClassaCommonStockEffectsareAntiDilutiveTable</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Class a Common Stock Effects are Anti-Dilutive (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>996012 - Disclosure - Retrospective Adjustments to Company Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/RetrospectiveAdjustmentstoCompanyStockDetails</Role>
      <ShortName>Retrospective Adjustments to Company Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/RetrospectiveAdjustmentstoCompanyStock</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>996013 - Disclosure - Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/PropertyandEquipmentDetails</Role>
      <ShortName>Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/PropertyandEquipmentTables</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>996014 - Disclosure - Property and Equipment - Schedule of Property and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofPropertyandEquipmentNetTable</Role>
      <ShortName>Property and Equipment - Schedule of Property and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>996015 - Disclosure - Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/IntangibleAssetsDetails</Role>
      <ShortName>Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/IntangibleAssetsTables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>996016 - Disclosure - Intangible Assets - Schedule of Intangible Assets, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofIntangibleAssetsNetTable</Role>
      <ShortName>Intangible Assets - Schedule of Intangible Assets, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>996017 - Disclosure - Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/DebtDetails</Role>
      <ShortName>Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/Debt</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>996018 - Disclosure - Stockholders’ Deficit and Mezzanine Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/StockholdersDeficitandMezzanineEquityDetails</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/StockholdersDeficitandMezzanineEquityTables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>996019 - Disclosure - Stockholders’ Deficit and Mezzanine Equity - Schedule of Redemption Value of Shares of Series A Preferred Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofRedemptionValueofSharesofSeriesAPreferredStockTable</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity - Schedule of Redemption Value of Shares of Series A Preferred Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>996020 - Disclosure - Stockholders’ Deficit and Mezzanine Equity - Schedule of Outstanding Stock Warrants (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofOutstandingStockWarrantsTable</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity - Schedule of Outstanding Stock Warrants (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>996021 - Disclosure - Stockholders’ Deficit and Mezzanine Equity - Schedule of Classes of Outstanding Stock Warrants (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofClassesofOutstandingStockWarrantsTable</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity - Schedule of Classes of Outstanding Stock Warrants (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>996022 - Disclosure - Stockholders’ Deficit and Mezzanine Equity - Schedule of Outstanding Stock Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofOutstandingStockOptionsTable</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity - Schedule of Outstanding Stock Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>996023 - Disclosure - Stockholders’ Deficit and Mezzanine Equity - Schedule of Vesting Terms of Outstanding Stock Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofVestingTermsofOutstandingStockOptionsTable</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity - Schedule of Vesting Terms of Outstanding Stock Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>996024 - Disclosure - Stockholders’ Deficit and Mezzanine Equity - Schedule of Weighted average Grant Share-Based Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofWeightedaverageGrantShareBasedAwardsTable</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity - Schedule of Weighted average Grant Share-Based Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>996025 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/CommitmentsandContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/CommitmentsandContingencies</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>996026 - Disclosure - Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/LeasesDetails</Role>
      <ShortName>Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/LeasesTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>996027 - Disclosure - Leases - Schedule of Lease Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofLeaseAssetsandLiabilitiesTable</Role>
      <ShortName>Leases - Schedule of Lease Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>996028 - Disclosure - Leases - Schedule of Components of Lease Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofComponentsofLeaseExpenseTable</Role>
      <ShortName>Leases - Schedule of Components of Lease Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>996029 - Disclosure - Leases - Schedule of Supplemental Disclosures of Cash Flow Information Related to Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofSupplementalDisclosuresofCashFlowInformationRelatedtoLeasesTable</Role>
      <ShortName>Leases - Schedule of Supplemental Disclosures of Cash Flow Information Related to Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>996030 - Disclosure - Leases - Schedule of Weighted Average Lease Term and Discount Rates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofWeightedAverageLeaseTermandDiscountRatesTable</Role>
      <ShortName>Leases - Schedule of Weighted Average Lease Term and Discount Rates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>996031 - Disclosure - Leases - Schedule of Future Payments Due Under Leases Reconciled to Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofFuturePaymentsDueUnderLeasesReconciledtoLeaseLiabilitiesTable</Role>
      <ShortName>Leases - Schedule of Future Payments Due Under Leases Reconciled to Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>996032 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/IncomeTaxesTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>996033 - Disclosure - Income Taxes - Schedule of Reconciliation of the Statutory U.S. Federal Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofReconciliationoftheStatutoryUSFederalRateTable</Role>
      <ShortName>Income Taxes - Schedule of Reconciliation of the Statutory U.S. Federal Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>996034 - Disclosure - Income Taxes - Schedule of Significant Portion of the Deferred Tax Assets / (Liabilities) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofSignificantPortionoftheDeferredTaxAssetsLiabilitiesTable</Role>
      <ShortName>Income Taxes - Schedule of Significant Portion of the Deferred Tax Assets / (Liabilities) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>996035 - Disclosure - Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/RelatedPartiesDetails</Role>
      <ShortName>Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/RelatedParties</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>996036 - Disclosure - Disaggregation of Revenues (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/DisaggregationofRevenuesDetails</Role>
      <ShortName>Disaggregation of Revenues (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/DisaggregationofRevenuesTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>996037 - Disclosure - Disaggregation of Revenues - Schedule of Net Sales Disaggregated by Significant Products and Services (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofNetSalesDisaggregatedbySignificantProductsandServicesTable</Role>
      <ShortName>Disaggregation of Revenues - Schedule of Net Sales Disaggregated by Significant Products and Services (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>996038 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/SubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/SubsequentEvents</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996039 - Disclosure - Summary of Significant Accounting Policies - Schedule of the Following Table Provides the Number of Class A Common Stock Equivalents (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleoftheFollowingTableProvidestheNumberofClassACommonStockEquivalentsTable</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of the Following Table Provides the Number of Class A Common Stock Equivalents (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996040 - Disclosure - Segment Reporting (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/SegmentReportingDetails</Role>
      <ShortName>Segment Reporting (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.freecast.com/role/SegmentReporting</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996041 - Disclosure - Property and Equipment - Schedule of Property and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofPropertyandEquipmentNetTable0</Role>
      <ShortName>Property and Equipment - Schedule of Property and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996042 - Disclosure - Stockholders’ Deficit and Mezzanine Equity - Schedule of Outstanding Stock Warrants (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofOutstandingStockWarrantsTable0</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity - Schedule of Outstanding Stock Warrants (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996043 - Disclosure - Stockholders’ Deficit and Mezzanine Equity - Schedule of Classes of Outstanding Stock Warrants (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofClassesofOutstandingStockWarrantsTable0</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity - Schedule of Classes of Outstanding Stock Warrants (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996044 - Disclosure - Stockholders’ Deficit and Mezzanine Equity - Schedule of Outstanding Stock Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofOutstandingStockOptionsTable0</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity - Schedule of Outstanding Stock Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996045 - Disclosure - Stockholders’ Deficit and Mezzanine Equity - Schedule of Vesting Terms (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofVestingTermsTable</Role>
      <ShortName>Stockholders’ Deficit and Mezzanine Equity - Schedule of Vesting Terms (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996046 - Disclosure - Leases - Schedule of Classification of Operating and Finance Lease (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofClassificationofOperatingandFinanceLeaseTable</Role>
      <ShortName>Leases - Schedule of Classification of Operating and Finance Lease (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996047 - Disclosure - Leases - Schedule of Future Payments Due Under Leases Reconciled to Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofFuturePaymentsDueUnderLeasesReconciledtoLeaseLiabilitiesTable0</Role>
      <ShortName>Leases - Schedule of Future Payments Due Under Leases Reconciled to Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ea0298077-s1_freecast.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996048 - Disclosure - Disaggregation of Revenues - Schedule of Net Sales Disaggregated by Significant Products and Services (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.freecast.com/role/ScheduleofNetSalesDisaggregatedbySignificantProductsandServicesTable0</Role>
      <ShortName>Disaggregation of Revenues - Schedule of Net Sales Disaggregated by Significant Products and Services (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ea029807701ex-fee.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>995210 - Document - Submission</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ffd/role/document/submissionTable</Role>
      <ShortName>Submission</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ea029807701ex-fee.htm">
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>995211 - Document - Offerings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ffd/role/document/feesOfferingTable</Role>
      <ShortName>Offerings</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="ea029807701ex-fee.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>995215 - Document - Fees Summary</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ffd/role/document/feesSummaryTable</Role>
      <ShortName>Fees Summary</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>cast-20260331.xsd</File>
    <File>cast-20260331_cal.xml</File>
    <File>cast-20260331_def.xml</File>
    <File>cast-20260331_lab.xml</File>
    <File>cast-20260331_pre.xml</File>
    <File doctype="S-1" isDefinitelyFs="true" isUsgaap="true" original="ea0298077-s1_freecast.htm">ea0298077-s1_freecast.htm</File>
    <File doctype="EX-FILING FEES" original="ea029807701ex-fee.htm">ea029807701ex-fee.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>ea029807701_img1.jpg</File>
    <File>ea029807701_img2.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1492">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="2">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="9">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="19">http://xbrl.sec.gov/ffd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
