<?xml version="1.0" encoding="utf-8"?>
<xbrl
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  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:dpcs="http://dpcs.com/20251112"
  xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:us-gaap="http://fasb.org/us-gaap/2025"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="dpcs-20251112.xsd" xlink:type="simple"/>
    <context id="From2025-11-12to2025-11-12">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001857803</identifier>
        </entity>
        <period>
            <startDate>2025-11-12</startDate>
            <endDate>2025-11-12</endDate>
        </period>
    </context>
    <context id="From2025-11-12to2025-11-12_dpcs_CommonClassAOrdinarySharesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001857803</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">dpcs:CommonClassAOrdinarySharesMember</xbrldi:explicitMember>
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        </entity>
        <period>
            <startDate>2025-11-12</startDate>
            <endDate>2025-11-12</endDate>
        </period>
    </context>
    <context id="From2025-11-12to2025-11-12_dpcs_ClassAOrdinarySharesShareMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001857803</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">dpcs:ClassAOrdinarySharesShareMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-11-12</startDate>
            <endDate>2025-11-12</endDate>
        </period>
    </context>
    <context id="From2025-11-12to2025-11-12_dpcs_RedeemableWarrantsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001857803</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">dpcs:RedeemableWarrantsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-11-12</startDate>
            <endDate>2025-11-12</endDate>
        </period>
    </context>
    <unit id="USD">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="Shares">
        <measure>shares</measure>
    </unit>
    <unit id="USDPShares">
        <divide>
            <unitNumerator>
                <measure>iso4217:USD</measure>
            </unitNumerator>
            <unitDenominator>
                <measure>shares</measure>
            </unitDenominator>
        </divide>
    </unit>
    <dei:EntityCentralIndexKey contextRef="From2025-11-12to2025-11-12" id="ixv-445">0001857803</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag contextRef="From2025-11-12to2025-11-12" id="ixv-446">false</dei:AmendmentFlag>
    <dei:CurrentFiscalYearEndDate contextRef="From2025-11-12to2025-11-12" id="ixv-447">--12-31</dei:CurrentFiscalYearEndDate>
    <dei:DocumentType contextRef="From2025-11-12to2025-11-12" id="ixv-491">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="From2025-11-12to2025-11-12" id="ixv-492">2025-11-12</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName contextRef="From2025-11-12to2025-11-12" id="ixv-493">DP Cap Acquisition Corp I</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode contextRef="From2025-11-12to2025-11-12" id="ixv-494">E9</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber contextRef="From2025-11-12to2025-11-12" id="ixv-495">001-41041</dei:EntityFileNumber>
    <dei:EntityAddressAddressLine1 contextRef="From2025-11-12to2025-11-12" id="ixv-496">418 Broadway</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2 contextRef="From2025-11-12to2025-11-12" id="ixv-497">#6895</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown contextRef="From2025-11-12to2025-11-12" id="ixv-498">Albany</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince contextRef="From2025-11-12to2025-11-12" id="ixv-499">NY</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode contextRef="From2025-11-12to2025-11-12" id="ixv-500">12207</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode contextRef="From2025-11-12to2025-11-12" id="ixv-501">929</dei:CityAreaCode>
    <dei:LocalPhoneNumber contextRef="From2025-11-12to2025-11-12" id="ixv-502">392-3578</dei:LocalPhoneNumber>
    <dei:WrittenCommunications contextRef="From2025-11-12to2025-11-12" id="ixv-503">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial contextRef="From2025-11-12to2025-11-12" id="ixv-504">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer contextRef="From2025-11-12to2025-11-12" id="ixv-505">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer contextRef="From2025-11-12to2025-11-12" id="ixv-506">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="From2025-11-12to2025-11-12_dpcs_CommonClassAOrdinarySharesMember"
      id="aid_2_0">Units, each consisting of one Class A ordinary share, par value $0.0001, and one-half of one redeemable warrant</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2025-11-12to2025-11-12_dpcs_CommonClassAOrdinarySharesMember"
      id="aid_2_1">DPCSU</dei:TradingSymbol>
    <dei:Security12bTitle
      contextRef="From2025-11-12to2025-11-12_dpcs_ClassAOrdinarySharesShareMember"
      id="aid_1_0">Class A ordinary shares, par value $0.0001 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2025-11-12to2025-11-12_dpcs_ClassAOrdinarySharesShareMember"
      id="aid_1_1">DPCS</dei:TradingSymbol>
    <dei:Security12bTitle
      contextRef="From2025-11-12to2025-11-12_dpcs_RedeemableWarrantsMember"
      id="aid_3_0">Warrants, each whole warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2025-11-12to2025-11-12_dpcs_RedeemableWarrantsMember"
      id="aid_3_1">DPCSW</dei:TradingSymbol>
    <dei:EntityEmergingGrowthCompany contextRef="From2025-11-12to2025-11-12" id="ixv-513">true</dei:EntityEmergingGrowthCompany>
    <dei:EntityExTransitionPeriod contextRef="From2025-11-12to2025-11-12" id="ixv-514">false</dei:EntityExTransitionPeriod>
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