<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:VECA="http://vernal.com/20260505"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  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="veca-20260505.xsd" xlink:type="simple"/>
    <context id="AsOf2026-05-05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002081690</identifier>
        </entity>
        <period>
            <startDate>2026-05-05</startDate>
            <endDate>2026-05-05</endDate>
        </period>
    </context>
    <context id="From2026-05-052026-05-05_custom_UnitsEachConsistingOfOneOrdinaryShareAndOneRightEntitlingHolderToReceiveOnefourth14OfOneOrdinaryShareMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002081690</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">VECA:UnitsEachConsistingOfOneOrdinaryShareAndOneRightEntitlingHolderToReceiveOnefourth14OfOneOrdinaryShareMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-05-05</startDate>
            <endDate>2026-05-05</endDate>
        </period>
    </context>
    <context id="From2026-05-052026-05-05_custom_OrdinarySharesParValue0.0001PerShareMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002081690</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">VECA:OrdinarySharesParValue0.0001PerShareMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-05-05</startDate>
            <endDate>2026-05-05</endDate>
        </period>
    </context>
    <context id="From2026-05-052026-05-05_custom_RightsEachRightEntitlingHolderToReceiveOnefourth14OfOneOrdinaryShareMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002081690</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">VECA:RightsEachRightEntitlingHolderToReceiveOnefourth14OfOneOrdinaryShareMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-05-05</startDate>
            <endDate>2026-05-05</endDate>
        </period>
    </context>
    <dei:AmendmentFlag contextRef="AsOf2026-05-05" id="Fact000003">false</dei:AmendmentFlag>
    <dei:CurrentFiscalYearEndDate contextRef="AsOf2026-05-05" id="Fact000004">--07-31</dei:CurrentFiscalYearEndDate>
    <dei:EntityCentralIndexKey contextRef="AsOf2026-05-05" id="Fact000005">0002081690</dei:EntityCentralIndexKey>
    <dei:EntityTaxIdentificationNumber contextRef="AsOf2026-05-05" id="xdx2ixbrl0015">00-0000000</dei:EntityTaxIdentificationNumber>
    <dei:DocumentType contextRef="AsOf2026-05-05" id="Fact000010">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="AsOf2026-05-05" id="Fact000011">2026-05-05</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName contextRef="AsOf2026-05-05" id="Fact000012">Vernal Capital Acquisition Corp.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode contextRef="AsOf2026-05-05" id="Fact000013">E9</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber contextRef="AsOf2026-05-05" id="Fact000014">001-43269</dei:EntityFileNumber>
    <dei:EntityAddressAddressLine1 contextRef="AsOf2026-05-05" id="Fact000016">244 Fifth Avenue</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2 contextRef="AsOf2026-05-05" id="Fact000017">Suite #1845</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown contextRef="AsOf2026-05-05" id="Fact000018">New York</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince contextRef="AsOf2026-05-05" id="Fact000019">NY</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode contextRef="AsOf2026-05-05" id="Fact000020">10001</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode contextRef="AsOf2026-05-05" id="Fact000021">65</dei:CityAreaCode>
    <dei:LocalPhoneNumber contextRef="AsOf2026-05-05" id="Fact000022">9328 8727</dei:LocalPhoneNumber>
    <dei:WrittenCommunications contextRef="AsOf2026-05-05" id="Fact000023">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial contextRef="AsOf2026-05-05" id="Fact000024">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer contextRef="AsOf2026-05-05" id="Fact000025">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer contextRef="AsOf2026-05-05" id="Fact000026">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="From2026-05-052026-05-05_custom_UnitsEachConsistingOfOneOrdinaryShareAndOneRightEntitlingHolderToReceiveOnefourth14OfOneOrdinaryShareMember"
      id="Fact000027">Units, each consisting of one ordinary share and one right entitling the holder to receive one-fourth (1/4) of one ordinary share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-05-052026-05-05_custom_UnitsEachConsistingOfOneOrdinaryShareAndOneRightEntitlingHolderToReceiveOnefourth14OfOneOrdinaryShareMember"
      id="Fact000028">VECAU</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-05-052026-05-05_custom_UnitsEachConsistingOfOneOrdinaryShareAndOneRightEntitlingHolderToReceiveOnefourth14OfOneOrdinaryShareMember"
      id="Fact000029">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-05-052026-05-05_custom_OrdinarySharesParValue0.0001PerShareMember"
      id="Fact000030">Ordinary Shares, par value $0.0001 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-05-052026-05-05_custom_OrdinarySharesParValue0.0001PerShareMember"
      id="Fact000031">VECA</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-05-052026-05-05_custom_OrdinarySharesParValue0.0001PerShareMember"
      id="Fact000032">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="From2026-05-052026-05-05_custom_RightsEachRightEntitlingHolderToReceiveOnefourth14OfOneOrdinaryShareMember"
      id="Fact000033">Rights, each right entitling the holder to receive one-fourth (1/4) of one ordinary share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="From2026-05-052026-05-05_custom_RightsEachRightEntitlingHolderToReceiveOnefourth14OfOneOrdinaryShareMember"
      id="Fact000034">VECAR</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="From2026-05-052026-05-05_custom_RightsEachRightEntitlingHolderToReceiveOnefourth14OfOneOrdinaryShareMember"
      id="Fact000035">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany contextRef="AsOf2026-05-05" id="Fact000036">true</dei:EntityEmergingGrowthCompany>
    <dei:EntityExTransitionPeriod contextRef="AsOf2026-05-05" id="Fact000037">false</dei:EntityExTransitionPeriod>
</xbrl>
