<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xml:lang="en-US"
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:ifrs-full="https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full"
  xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:valn="http://valneva.com/20260331"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xhtml="http://www.w3.org/1999/xhtml"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="valn-20260331.xsd" xlink:type="simple"/>
    <context id="c-1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
        </entity>
        <period>
            <startDate>2026-01-01</startDate>
            <endDate>2026-03-31</endDate>
        </period>
    </context>
    <context id="c-2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-03-31</endDate>
        </period>
    </context>
    <context id="c-3">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
        </entity>
        <period>
            <instant>2026-03-31</instant>
        </period>
    </context>
    <context id="c-4">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
        </entity>
        <period>
            <instant>2025-12-31</instant>
        </period>
    </context>
    <context id="c-5">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
        </entity>
        <period>
            <instant>2024-12-31</instant>
        </period>
    </context>
    <context id="c-6">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
        </entity>
        <period>
            <instant>2025-03-31</instant>
        </period>
    </context>
    <context id="c-7">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:IssuedCapitalMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2025-12-31</instant>
        </period>
    </context>
    <context id="c-8">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:SharePremiumMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2025-12-31</instant>
        </period>
    </context>
    <context id="c-9">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:OtherReservesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2025-12-31</instant>
        </period>
    </context>
    <context id="c-10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsExcludingProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2025-12-31</instant>
        </period>
    </context>
    <context id="c-11">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2025-12-31</instant>
        </period>
    </context>
    <context id="c-12">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:OtherReservesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-01-01</startDate>
            <endDate>2026-03-31</endDate>
        </period>
    </context>
    <context id="c-13">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-01-01</startDate>
            <endDate>2026-03-31</endDate>
        </period>
    </context>
    <context id="c-14">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsExcludingProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-01-01</startDate>
            <endDate>2026-03-31</endDate>
        </period>
    </context>
    <context id="c-15">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:IssuedCapitalMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-01-01</startDate>
            <endDate>2026-03-31</endDate>
        </period>
    </context>
    <context id="c-16">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:SharePremiumMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-01-01</startDate>
            <endDate>2026-03-31</endDate>
        </period>
    </context>
    <context id="c-17">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:IssuedCapitalMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2026-03-31</instant>
        </period>
    </context>
    <context id="c-18">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:SharePremiumMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2026-03-31</instant>
        </period>
    </context>
    <context id="c-19">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:OtherReservesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2026-03-31</instant>
        </period>
    </context>
    <context id="c-20">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsExcludingProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2026-03-31</instant>
        </period>
    </context>
    <context id="c-21">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2026-03-31</instant>
        </period>
    </context>
    <context id="c-22">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:IssuedCapitalMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2024-12-31</instant>
        </period>
    </context>
    <context id="c-23">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:SharePremiumMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2024-12-31</instant>
        </period>
    </context>
    <context id="c-24">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:OtherReservesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2024-12-31</instant>
        </period>
    </context>
    <context id="c-25">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsExcludingProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2024-12-31</instant>
        </period>
    </context>
    <context id="c-26">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2024-12-31</instant>
        </period>
    </context>
    <context id="c-27">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:OtherReservesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-03-31</endDate>
        </period>
    </context>
    <context id="c-28">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-03-31</endDate>
        </period>
    </context>
    <context id="c-29">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsExcludingProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-03-31</endDate>
        </period>
    </context>
    <context id="c-30">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:IssuedCapitalMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2025-03-31</instant>
        </period>
    </context>
    <context id="c-31">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:SharePremiumMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2025-03-31</instant>
        </period>
    </context>
    <context id="c-32">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:OtherReservesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2025-03-31</instant>
        </period>
    </context>
    <context id="c-33">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsExcludingProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2025-03-31</instant>
        </period>
    </context>
    <context id="c-34">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001836564</identifier>
            <segment>
                <xbrldi:explicitMember dimension="ifrs-full:ComponentsOfEquityAxis">ifrs-full:RetainedEarningsProfitLossForReportingPeriodMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <instant>2025-03-31</instant>
        </period>
    </context>
    <unit id="eur">
        <measure>iso4217:EUR</measure>
    </unit>
    <unit id="eurPerShare">
        <divide>
            <unitNumerator>
                <measure>iso4217:EUR</measure>
            </unitNumerator>
            <unitDenominator>
                <measure>shares</measure>
            </unitDenominator>
        </divide>
    </unit>
    <dei:DocumentType contextRef="c-1" id="f-1">6-K</dei:DocumentType>
    <dei:EntityRegistrantName contextRef="c-1" id="f-2">VALNEVA SE</dei:EntityRegistrantName>
    <dei:DocumentType contextRef="c-1" id="f-3">6-K</dei:DocumentType>
    <dei:EntityRegistrantName contextRef="c-1" id="f-4">VALNEVA SE</dei:EntityRegistrantName>
    <dei:EntityCentralIndexKey contextRef="c-1" id="f-5">0001836564</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag contextRef="c-1" id="f-6">false</dei:AmendmentFlag>
    <dei:DocumentFiscalYearFocus contextRef="c-1" id="f-7">2026</dei:DocumentFiscalYearFocus>
    <dei:DocumentFiscalPeriodFocus contextRef="c-1" id="f-8">Q1</dei:DocumentFiscalPeriodFocus>
    <dei:CurrentFiscalYearEndDate contextRef="c-1" id="f-9">--12-31</dei:CurrentFiscalYearEndDate>
    <dei:DocumentPeriodEndDate contextRef="c-1" id="f-10">2026-03-31</dei:DocumentPeriodEndDate>
    <ifrs-full:RevenueFromSaleOfGoods contextRef="c-1" decimals="-3" id="f-11" unitRef="eur">30517000</ifrs-full:RevenueFromSaleOfGoods>
    <ifrs-full:RevenueFromSaleOfGoods contextRef="c-2" decimals="-3" id="f-12" unitRef="eur">48598000</ifrs-full:RevenueFromSaleOfGoods>
    <ifrs-full:OtherRevenue contextRef="c-1" decimals="-3" id="f-13" unitRef="eur">386000</ifrs-full:OtherRevenue>
    <ifrs-full:OtherRevenue contextRef="c-2" decimals="-3" id="f-14" unitRef="eur">634000</ifrs-full:OtherRevenue>
    <ifrs-full:Revenue contextRef="c-1" decimals="-3" id="f-15" unitRef="eur">30904000</ifrs-full:Revenue>
    <ifrs-full:Revenue contextRef="c-2" decimals="-3" id="f-16" unitRef="eur">49232000</ifrs-full:Revenue>
    <ifrs-full:CostOfSales contextRef="c-1" decimals="-3" id="f-17" unitRef="eur">26180000</ifrs-full:CostOfSales>
    <ifrs-full:CostOfSales contextRef="c-2" decimals="-3" id="f-18" unitRef="eur">23043000</ifrs-full:CostOfSales>
    <ifrs-full:ResearchAndDevelopmentExpense contextRef="c-1" decimals="-3" id="f-19" unitRef="eur">15215000</ifrs-full:ResearchAndDevelopmentExpense>
    <ifrs-full:ResearchAndDevelopmentExpense contextRef="c-2" decimals="-3" id="f-20" unitRef="eur">14953000</ifrs-full:ResearchAndDevelopmentExpense>
    <valn:MarketingAndDistributionExpenses contextRef="c-1" decimals="-3" id="f-21" unitRef="eur">6969000</valn:MarketingAndDistributionExpenses>
    <valn:MarketingAndDistributionExpenses contextRef="c-2" decimals="-3" id="f-22" unitRef="eur">10393000</valn:MarketingAndDistributionExpenses>
    <ifrs-full:GeneralAndAdministrativeExpense contextRef="c-1" decimals="-3" id="f-23" unitRef="eur">8169000</ifrs-full:GeneralAndAdministrativeExpense>
    <ifrs-full:GeneralAndAdministrativeExpense contextRef="c-2" decimals="-3" id="f-24" unitRef="eur">8964000</ifrs-full:GeneralAndAdministrativeExpense>
    <ifrs-full:OtherOperatingIncomeExpense contextRef="c-1" decimals="-3" id="f-25" unitRef="eur">1934000</ifrs-full:OtherOperatingIncomeExpense>
    <ifrs-full:OtherOperatingIncomeExpense contextRef="c-2" decimals="-3" id="f-26" unitRef="eur">2160000</ifrs-full:OtherOperatingIncomeExpense>
    <ifrs-full:ProfitLossFromOperatingActivities contextRef="c-1" decimals="-3" id="f-27" unitRef="eur">-23696000</ifrs-full:ProfitLossFromOperatingActivities>
    <ifrs-full:ProfitLossFromOperatingActivities contextRef="c-2" decimals="-3" id="f-28" unitRef="eur">-5960000</ifrs-full:ProfitLossFromOperatingActivities>
    <ifrs-full:FinanceIncome contextRef="c-1" decimals="-3" id="f-29" unitRef="eur">526000</ifrs-full:FinanceIncome>
    <ifrs-full:FinanceIncome contextRef="c-2" decimals="-3" id="f-30" unitRef="eur">511000</ifrs-full:FinanceIncome>
    <ifrs-full:FinanceCosts contextRef="c-1" decimals="-3" id="f-31" unitRef="eur">5092000</ifrs-full:FinanceCosts>
    <ifrs-full:FinanceCosts contextRef="c-2" decimals="-3" id="f-32" unitRef="eur">5979000</ifrs-full:FinanceCosts>
    <ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss contextRef="c-1" decimals="-3" id="f-33" unitRef="eur">-2988000</ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss>
    <ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss contextRef="c-2" decimals="-3" id="f-34" unitRef="eur">3670000</ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss>
    <ifrs-full:ProfitLossBeforeTax contextRef="c-1" decimals="-3" id="f-35" unitRef="eur">-31249000</ifrs-full:ProfitLossBeforeTax>
    <ifrs-full:ProfitLossBeforeTax contextRef="c-2" decimals="-3" id="f-36" unitRef="eur">-7758000</ifrs-full:ProfitLossBeforeTax>
    <ifrs-full:IncomeTaxExpenseContinuingOperations contextRef="c-1" decimals="-3" id="f-37" unitRef="eur">824000</ifrs-full:IncomeTaxExpenseContinuingOperations>
    <ifrs-full:IncomeTaxExpenseContinuingOperations contextRef="c-2" decimals="-3" id="f-38" unitRef="eur">1474000</ifrs-full:IncomeTaxExpenseContinuingOperations>
    <ifrs-full:ProfitLoss contextRef="c-1" decimals="-3" id="f-39" unitRef="eur">-32073000</ifrs-full:ProfitLoss>
    <ifrs-full:ProfitLoss contextRef="c-2" decimals="-3" id="f-40" unitRef="eur">-9232000</ifrs-full:ProfitLoss>
    <ifrs-full:BasicEarningsLossPerShare
      contextRef="c-1"
      decimals="2"
      id="f-41"
      unitRef="eurPerShare">-0.18</ifrs-full:BasicEarningsLossPerShare>
    <ifrs-full:BasicEarningsLossPerShare
      contextRef="c-2"
      decimals="2"
      id="f-42"
      unitRef="eurPerShare">-0.06</ifrs-full:BasicEarningsLossPerShare>
    <ifrs-full:DilutedEarningsLossPerShare
      contextRef="c-1"
      decimals="2"
      id="f-43"
      unitRef="eurPerShare">-0.18</ifrs-full:DilutedEarningsLossPerShare>
    <ifrs-full:DilutedEarningsLossPerShare
      contextRef="c-2"
      decimals="2"
      id="f-44"
      unitRef="eurPerShare">-0.06</ifrs-full:DilutedEarningsLossPerShare>
    <ifrs-full:ProfitLoss contextRef="c-1" decimals="-3" id="f-45" unitRef="eur">-32073000</ifrs-full:ProfitLoss>
    <ifrs-full:ProfitLoss contextRef="c-2" decimals="-3" id="f-46" unitRef="eur">-9232000</ifrs-full:ProfitLoss>
    <ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation contextRef="c-1" decimals="-3" id="f-47" unitRef="eur">-207000</ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation>
    <ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation contextRef="c-2" decimals="-3" id="f-48" unitRef="eur">983000</ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation>
    <ifrs-full:OtherComprehensiveIncome contextRef="c-1" decimals="-3" id="f-49" unitRef="eur">-207000</ifrs-full:OtherComprehensiveIncome>
    <ifrs-full:OtherComprehensiveIncome contextRef="c-2" decimals="-3" id="f-50" unitRef="eur">983000</ifrs-full:OtherComprehensiveIncome>
    <ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent contextRef="c-1" decimals="-3" id="f-51" unitRef="eur">-32280000</ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent>
    <ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent contextRef="c-2" decimals="-3" id="f-52" unitRef="eur">-8249000</ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent>
    <ifrs-full:NoncurrentAssets contextRef="c-3" decimals="-3" id="f-53" unitRef="eur">170574000</ifrs-full:NoncurrentAssets>
    <ifrs-full:NoncurrentAssets contextRef="c-4" decimals="-3" id="f-54" unitRef="eur">176296000</ifrs-full:NoncurrentAssets>
    <ifrs-full:IntangibleAssetsOtherThanGoodwill contextRef="c-3" decimals="-3" id="f-55" unitRef="eur">21631000</ifrs-full:IntangibleAssetsOtherThanGoodwill>
    <ifrs-full:IntangibleAssetsOtherThanGoodwill contextRef="c-4" decimals="-3" id="f-56" unitRef="eur">22349000</ifrs-full:IntangibleAssetsOtherThanGoodwill>
    <ifrs-full:RightofuseAssets contextRef="c-3" decimals="-3" id="f-57" unitRef="eur">17954000</ifrs-full:RightofuseAssets>
    <ifrs-full:RightofuseAssets contextRef="c-4" decimals="-3" id="f-58" unitRef="eur">18558000</ifrs-full:RightofuseAssets>
    <ifrs-full:PropertyPlantAndEquipment contextRef="c-3" decimals="-3" id="f-59" unitRef="eur">115654000</ifrs-full:PropertyPlantAndEquipment>
    <ifrs-full:PropertyPlantAndEquipment contextRef="c-4" decimals="-3" id="f-60" unitRef="eur">119474000</ifrs-full:PropertyPlantAndEquipment>
    <ifrs-full:DeferredTaxAssets contextRef="c-3" decimals="-3" id="f-61" unitRef="eur">7759000</ifrs-full:DeferredTaxAssets>
    <ifrs-full:DeferredTaxAssets contextRef="c-4" decimals="-3" id="f-62" unitRef="eur">8326000</ifrs-full:DeferredTaxAssets>
    <ifrs-full:OtherNoncurrentAssets contextRef="c-3" decimals="-3" id="f-63" unitRef="eur">7577000</ifrs-full:OtherNoncurrentAssets>
    <ifrs-full:OtherNoncurrentAssets contextRef="c-4" decimals="-3" id="f-64" unitRef="eur">7590000</ifrs-full:OtherNoncurrentAssets>
    <ifrs-full:CurrentAssets contextRef="c-3" decimals="-3" id="f-65" unitRef="eur">201439000</ifrs-full:CurrentAssets>
    <ifrs-full:CurrentAssets contextRef="c-4" decimals="-3" id="f-66" unitRef="eur">222540000</ifrs-full:CurrentAssets>
    <ifrs-full:Inventories contextRef="c-3" decimals="-3" id="f-67" unitRef="eur">50584000</ifrs-full:Inventories>
    <ifrs-full:Inventories contextRef="c-4" decimals="-3" id="f-68" unitRef="eur">50232000</ifrs-full:Inventories>
    <ifrs-full:TradeAndOtherCurrentReceivables contextRef="c-3" decimals="-3" id="f-69" unitRef="eur">10132000</ifrs-full:TradeAndOtherCurrentReceivables>
    <ifrs-full:TradeAndOtherCurrentReceivables contextRef="c-4" decimals="-3" id="f-70" unitRef="eur">27813000</ifrs-full:TradeAndOtherCurrentReceivables>
    <ifrs-full:OtherCurrentAssets contextRef="c-3" decimals="-3" id="f-71" unitRef="eur">35458000</ifrs-full:OtherCurrentAssets>
    <ifrs-full:OtherCurrentAssets contextRef="c-4" decimals="-3" id="f-72" unitRef="eur">34846000</ifrs-full:OtherCurrentAssets>
    <ifrs-full:CashAndCashEquivalents contextRef="c-3" decimals="-3" id="f-73" unitRef="eur">105265000</ifrs-full:CashAndCashEquivalents>
    <ifrs-full:CashAndCashEquivalents contextRef="c-4" decimals="-3" id="f-74" unitRef="eur">109650000</ifrs-full:CashAndCashEquivalents>
    <ifrs-full:Assets contextRef="c-3" decimals="-3" id="f-75" unitRef="eur">372013000</ifrs-full:Assets>
    <ifrs-full:Assets contextRef="c-4" decimals="-3" id="f-76" unitRef="eur">398836000</ifrs-full:Assets>
    <ifrs-full:IssuedCapital contextRef="c-3" decimals="-3" id="f-77" unitRef="eur">26082000</ifrs-full:IssuedCapital>
    <ifrs-full:IssuedCapital contextRef="c-4" decimals="-3" id="f-78" unitRef="eur">26031000</ifrs-full:IssuedCapital>
    <ifrs-full:SharePremium contextRef="c-3" decimals="-3" id="f-79" unitRef="eur">676820000</ifrs-full:SharePremium>
    <ifrs-full:SharePremium contextRef="c-4" decimals="-3" id="f-80" unitRef="eur">675940000</ifrs-full:SharePremium>
    <ifrs-full:OtherReserves contextRef="c-3" decimals="-3" id="f-81" unitRef="eur">84991000</ifrs-full:OtherReserves>
    <ifrs-full:OtherReserves contextRef="c-4" decimals="-3" id="f-82" unitRef="eur">83318000</ifrs-full:OtherReserves>
    <ifrs-full:RetainedEarningsExcludingProfitLossForReportingPeriod contextRef="c-3" decimals="-3" id="f-83" unitRef="eur">-679121000</ifrs-full:RetainedEarningsExcludingProfitLossForReportingPeriod>
    <ifrs-full:RetainedEarningsExcludingProfitLossForReportingPeriod contextRef="c-4" decimals="-3" id="f-84" unitRef="eur">-563928000</ifrs-full:RetainedEarningsExcludingProfitLossForReportingPeriod>
    <ifrs-full:RetainedEarningsProfitLossForReportingPeriod contextRef="c-3" decimals="-3" id="f-85" unitRef="eur">-32073000</ifrs-full:RetainedEarningsProfitLossForReportingPeriod>
    <ifrs-full:RetainedEarningsProfitLossForReportingPeriod contextRef="c-4" decimals="-3" id="f-86" unitRef="eur">-115192000</ifrs-full:RetainedEarningsProfitLossForReportingPeriod>
    <ifrs-full:Equity contextRef="c-3" decimals="-3" id="f-87" unitRef="eur">76699000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-4" decimals="-3" id="f-88" unitRef="eur">106168000</ifrs-full:Equity>
    <ifrs-full:NoncurrentLiabilities contextRef="c-3" decimals="-3" id="f-89" unitRef="eur">201095000</ifrs-full:NoncurrentLiabilities>
    <ifrs-full:NoncurrentLiabilities contextRef="c-4" decimals="-3" id="f-90" unitRef="eur">199334000</ifrs-full:NoncurrentLiabilities>
    <ifrs-full:LongtermBorrowings contextRef="c-3" decimals="-3" id="f-91" unitRef="eur">164062000</ifrs-full:LongtermBorrowings>
    <ifrs-full:LongtermBorrowings contextRef="c-4" decimals="-3" id="f-92" unitRef="eur">161261000</ifrs-full:LongtermBorrowings>
    <ifrs-full:NoncurrentLeaseLiabilities contextRef="c-3" decimals="-3" id="f-93" unitRef="eur">24432000</ifrs-full:NoncurrentLeaseLiabilities>
    <ifrs-full:NoncurrentLeaseLiabilities contextRef="c-4" decimals="-3" id="f-94" unitRef="eur">25343000</ifrs-full:NoncurrentLeaseLiabilities>
    <valn:NonCurrentRefundLiabilities contextRef="c-3" decimals="-3" id="f-95" unitRef="eur">6734000</valn:NonCurrentRefundLiabilities>
    <valn:NonCurrentRefundLiabilities contextRef="c-4" decimals="-3" id="f-96" unitRef="eur">6684000</valn:NonCurrentRefundLiabilities>
    <ifrs-full:NoncurrentProvisions contextRef="c-3" decimals="-3" id="f-97" unitRef="eur">1198000</ifrs-full:NoncurrentProvisions>
    <ifrs-full:NoncurrentProvisions contextRef="c-4" decimals="-3" id="f-98" unitRef="eur">1392000</ifrs-full:NoncurrentProvisions>
    <ifrs-full:DeferredTaxLiabilities contextRef="c-3" decimals="-3" id="f-99" unitRef="eur">4430000</ifrs-full:DeferredTaxLiabilities>
    <ifrs-full:DeferredTaxLiabilities contextRef="c-4" decimals="-3" id="f-100" unitRef="eur">4409000</ifrs-full:DeferredTaxLiabilities>
    <ifrs-full:OtherNoncurrentLiabilities contextRef="c-3" decimals="-3" id="f-101" unitRef="eur">239000</ifrs-full:OtherNoncurrentLiabilities>
    <ifrs-full:OtherNoncurrentLiabilities contextRef="c-4" decimals="-3" id="f-102" unitRef="eur">246000</ifrs-full:OtherNoncurrentLiabilities>
    <ifrs-full:CurrentLiabilities contextRef="c-3" decimals="-3" id="f-103" unitRef="eur">94219000</ifrs-full:CurrentLiabilities>
    <ifrs-full:CurrentLiabilities contextRef="c-4" decimals="-3" id="f-104" unitRef="eur">93334000</ifrs-full:CurrentLiabilities>
    <ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings contextRef="c-3" decimals="-3" id="f-105" unitRef="eur">18271000</ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings>
    <ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings contextRef="c-4" decimals="-3" id="f-106" unitRef="eur">17905000</ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings>
    <ifrs-full:TradeAndOtherCurrentPayables contextRef="c-3" decimals="-3" id="f-107" unitRef="eur">21806000</ifrs-full:TradeAndOtherCurrentPayables>
    <ifrs-full:TradeAndOtherCurrentPayables contextRef="c-4" decimals="-3" id="f-108" unitRef="eur">24540000</ifrs-full:TradeAndOtherCurrentPayables>
    <ifrs-full:CurrentTaxLiabilities contextRef="c-3" decimals="-3" id="f-109" unitRef="eur">65000</ifrs-full:CurrentTaxLiabilities>
    <ifrs-full:CurrentTaxLiabilities contextRef="c-4" decimals="-3" id="f-110" unitRef="eur">1000</ifrs-full:CurrentTaxLiabilities>
    <valn:CurrentTaxAndEmployeeRelatedLiabilities contextRef="c-3" decimals="-3" id="f-111" unitRef="eur">22295000</valn:CurrentTaxAndEmployeeRelatedLiabilities>
    <valn:CurrentTaxAndEmployeeRelatedLiabilities contextRef="c-4" decimals="-3" id="f-112" unitRef="eur">19555000</valn:CurrentTaxAndEmployeeRelatedLiabilities>
    <ifrs-full:CurrentLeaseLiabilities contextRef="c-3" decimals="-3" id="f-113" unitRef="eur">2740000</ifrs-full:CurrentLeaseLiabilities>
    <ifrs-full:CurrentLeaseLiabilities contextRef="c-4" decimals="-3" id="f-114" unitRef="eur">2739000</ifrs-full:CurrentLeaseLiabilities>
    <ifrs-full:CurrentContractLiabilities contextRef="c-3" decimals="-3" id="f-115" unitRef="eur">427000</ifrs-full:CurrentContractLiabilities>
    <ifrs-full:CurrentContractLiabilities contextRef="c-4" decimals="-3" id="f-116" unitRef="eur">432000</ifrs-full:CurrentContractLiabilities>
    <valn:CurrentRefundLiabilities contextRef="c-3" decimals="-3" id="f-117" unitRef="eur">10869000</valn:CurrentRefundLiabilities>
    <valn:CurrentRefundLiabilities contextRef="c-4" decimals="-3" id="f-118" unitRef="eur">10814000</valn:CurrentRefundLiabilities>
    <ifrs-full:CurrentProvisions contextRef="c-3" decimals="-3" id="f-119" unitRef="eur">12334000</ifrs-full:CurrentProvisions>
    <ifrs-full:CurrentProvisions contextRef="c-4" decimals="-3" id="f-120" unitRef="eur">11659000</ifrs-full:CurrentProvisions>
    <ifrs-full:OtherCurrentLiabilities contextRef="c-3" decimals="-3" id="f-121" unitRef="eur">5411000</ifrs-full:OtherCurrentLiabilities>
    <ifrs-full:OtherCurrentLiabilities contextRef="c-4" decimals="-3" id="f-122" unitRef="eur">5689000</ifrs-full:OtherCurrentLiabilities>
    <ifrs-full:Liabilities contextRef="c-3" decimals="-3" id="f-123" unitRef="eur">295314000</ifrs-full:Liabilities>
    <ifrs-full:Liabilities contextRef="c-4" decimals="-3" id="f-124" unitRef="eur">292668000</ifrs-full:Liabilities>
    <ifrs-full:EquityAndLiabilities contextRef="c-3" decimals="-3" id="f-125" unitRef="eur">372013000</ifrs-full:EquityAndLiabilities>
    <ifrs-full:EquityAndLiabilities contextRef="c-4" decimals="-3" id="f-126" unitRef="eur">398836000</ifrs-full:EquityAndLiabilities>
    <ifrs-full:ProfitLoss contextRef="c-1" decimals="-3" id="f-127" unitRef="eur">-32073000</ifrs-full:ProfitLoss>
    <ifrs-full:ProfitLoss contextRef="c-2" decimals="-3" id="f-128" unitRef="eur">-9232000</ifrs-full:ProfitLoss>
    <ifrs-full:OtherAdjustmentsForNoncashItems contextRef="c-1" decimals="-3" id="f-129" unitRef="eur">14533000</ifrs-full:OtherAdjustmentsForNoncashItems>
    <ifrs-full:OtherAdjustmentsForNoncashItems contextRef="c-2" decimals="-3" id="f-130" unitRef="eur">10262000</ifrs-full:OtherAdjustmentsForNoncashItems>
    <valn:IncreaseDecreaseInNonCurrentOperatingAssetsAndLiabilities contextRef="c-1" decimals="-3" id="f-131" unitRef="eur">3000</valn:IncreaseDecreaseInNonCurrentOperatingAssetsAndLiabilities>
    <valn:IncreaseDecreaseInNonCurrentOperatingAssetsAndLiabilities contextRef="c-2" decimals="-3" id="f-132" unitRef="eur">409000</valn:IncreaseDecreaseInNonCurrentOperatingAssetsAndLiabilities>
    <ifrs-full:IncreaseDecreaseInWorkingCapital contextRef="c-1" decimals="-3" id="f-133" unitRef="eur">-17224000</ifrs-full:IncreaseDecreaseInWorkingCapital>
    <ifrs-full:IncreaseDecreaseInWorkingCapital contextRef="c-2" decimals="-3" id="f-134" unitRef="eur">9175000</ifrs-full:IncreaseDecreaseInWorkingCapital>
    <ifrs-full:CashFlowsFromUsedInOperations contextRef="c-1" decimals="-3" id="f-135" unitRef="eur">-312000</ifrs-full:CashFlowsFromUsedInOperations>
    <ifrs-full:CashFlowsFromUsedInOperations contextRef="c-2" decimals="-3" id="f-136" unitRef="eur">-7736000</ifrs-full:CashFlowsFromUsedInOperations>
    <ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities contextRef="c-1" decimals="-3" id="f-137" unitRef="eur">1000</ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities>
    <ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities contextRef="c-2" decimals="-3" id="f-138" unitRef="eur">411000</ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities>
    <ifrs-full:CashFlowsFromUsedInOperatingActivities contextRef="c-1" decimals="-3" id="f-139" unitRef="eur">-313000</ifrs-full:CashFlowsFromUsedInOperatingActivities>
    <ifrs-full:CashFlowsFromUsedInOperatingActivities contextRef="c-2" decimals="-3" id="f-140" unitRef="eur">-8148000</ifrs-full:CashFlowsFromUsedInOperatingActivities>
    <ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities contextRef="c-1" decimals="-3" id="f-141" unitRef="eur">247000</ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities>
    <ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities contextRef="c-2" decimals="-3" id="f-142" unitRef="eur">1402000</ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities>
    <ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities contextRef="c-1" decimals="-3" id="f-143" unitRef="eur">5000</ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities>
    <ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities contextRef="c-2" decimals="-3" id="f-144" unitRef="eur">71000</ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities>
    <valn:ProceedsFromSaleAndPurchaseOfMMFInvestments contextRef="c-1" decimals="-3" id="f-145" unitRef="eur">437000</valn:ProceedsFromSaleAndPurchaseOfMMFInvestments>
    <valn:ProceedsFromSaleAndPurchaseOfMMFInvestments contextRef="c-2" decimals="-3" id="f-146" unitRef="eur">0</valn:ProceedsFromSaleAndPurchaseOfMMFInvestments>
    <ifrs-full:InterestReceivedClassifiedAsInvestingActivities contextRef="c-1" decimals="-3" id="f-147" unitRef="eur">89000</ifrs-full:InterestReceivedClassifiedAsInvestingActivities>
    <ifrs-full:InterestReceivedClassifiedAsInvestingActivities contextRef="c-2" decimals="-3" id="f-148" unitRef="eur">511000</ifrs-full:InterestReceivedClassifiedAsInvestingActivities>
    <ifrs-full:CashFlowsFromUsedInInvestingActivities contextRef="c-1" decimals="-3" id="f-149" unitRef="eur">275000</ifrs-full:CashFlowsFromUsedInInvestingActivities>
    <ifrs-full:CashFlowsFromUsedInInvestingActivities contextRef="c-2" decimals="-3" id="f-150" unitRef="eur">-961000</ifrs-full:CashFlowsFromUsedInInvestingActivities>
    <valn:ProceedsRepaymentsFromTheIssuanceOfCommonSharesNetOfEquityTransactionCosts contextRef="c-1" decimals="-3" id="f-151" unitRef="eur">920000</valn:ProceedsRepaymentsFromTheIssuanceOfCommonSharesNetOfEquityTransactionCosts>
    <valn:ProceedsRepaymentsFromTheIssuanceOfCommonSharesNetOfEquityTransactionCosts contextRef="c-2" decimals="-3" id="f-152" unitRef="eur">0</valn:ProceedsRepaymentsFromTheIssuanceOfCommonSharesNetOfEquityTransactionCosts>
    <valn:ProceedsFromBorrowingsNetOfTransactionCost contextRef="c-1" decimals="-3" id="f-153" unitRef="eur">-516000</valn:ProceedsFromBorrowingsNetOfTransactionCost>
    <valn:ProceedsFromBorrowingsNetOfTransactionCost contextRef="c-2" decimals="-3" id="f-154" unitRef="eur">0</valn:ProceedsFromBorrowingsNetOfTransactionCost>
    <ifrs-full:PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities contextRef="c-1" decimals="-3" id="f-155" unitRef="eur">685000</ifrs-full:PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities>
    <ifrs-full:PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities contextRef="c-2" decimals="-3" id="f-156" unitRef="eur">685000</ifrs-full:PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities>
    <ifrs-full:InterestPaidClassifiedAsFinancingActivities contextRef="c-1" decimals="-3" id="f-157" unitRef="eur">4409000</ifrs-full:InterestPaidClassifiedAsFinancingActivities>
    <ifrs-full:InterestPaidClassifiedAsFinancingActivities contextRef="c-2" decimals="-3" id="f-158" unitRef="eur">4896000</ifrs-full:InterestPaidClassifiedAsFinancingActivities>
    <ifrs-full:CashFlowsFromUsedInFinancingActivities contextRef="c-1" decimals="-3" id="f-159" unitRef="eur">-4689000</ifrs-full:CashFlowsFromUsedInFinancingActivities>
    <ifrs-full:CashFlowsFromUsedInFinancingActivities contextRef="c-2" decimals="-3" id="f-160" unitRef="eur">-5582000</ifrs-full:CashFlowsFromUsedInFinancingActivities>
    <ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges contextRef="c-1" decimals="-3" id="f-161" unitRef="eur">-4727000</ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges>
    <ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges contextRef="c-2" decimals="-3" id="f-162" unitRef="eur">-14690000</ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges>
    <ifrs-full:CashAndCashEquivalents contextRef="c-4" decimals="-3" id="f-163" unitRef="eur">109650000</ifrs-full:CashAndCashEquivalents>
    <ifrs-full:CashAndCashEquivalents contextRef="c-5" decimals="-3" id="f-164" unitRef="eur">168271000</ifrs-full:CashAndCashEquivalents>
    <ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents contextRef="c-1" decimals="-3" id="f-165" unitRef="eur">342000</ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents>
    <ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents contextRef="c-2" decimals="-3" id="f-166" unitRef="eur">-590000</ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents>
    <ifrs-full:CashAndCashEquivalents contextRef="c-3" decimals="-3" id="f-167" unitRef="eur">105265000</ifrs-full:CashAndCashEquivalents>
    <ifrs-full:CashAndCashEquivalents contextRef="c-6" decimals="-3" id="f-168" unitRef="eur">152990000</ifrs-full:CashAndCashEquivalents>
    <valn:InterestPaidOnLeaseLiabilityClassifiedAsFinancingActivities contextRef="c-1" decimals="-5" id="f-169" unitRef="eur">200000</valn:InterestPaidOnLeaseLiabilityClassifiedAsFinancingActivities>
    <valn:InterestPaidOnLeaseLiabilityClassifiedAsFinancingActivities contextRef="c-2" decimals="-5" id="f-170" unitRef="eur">200000</valn:InterestPaidOnLeaseLiabilityClassifiedAsFinancingActivities>
    <ifrs-full:Equity contextRef="c-7" decimals="-3" id="f-171" unitRef="eur">26031000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-8" decimals="-3" id="f-172" unitRef="eur">675940000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-9" decimals="-3" id="f-173" unitRef="eur">83318000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-10" decimals="-3" id="f-174" unitRef="eur">-563928000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-11" decimals="-3" id="f-175" unitRef="eur">-115192000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-4" decimals="-3" id="f-176" unitRef="eur">106168000</ifrs-full:Equity>
    <ifrs-full:ComprehensiveIncome contextRef="c-12" decimals="-3" id="f-177" unitRef="eur">-207000</ifrs-full:ComprehensiveIncome>
    <ifrs-full:ComprehensiveIncome contextRef="c-13" decimals="-3" id="f-178" unitRef="eur">-32073000</ifrs-full:ComprehensiveIncome>
    <ifrs-full:ComprehensiveIncome contextRef="c-1" decimals="-3" id="f-179" unitRef="eur">-32280000</ifrs-full:ComprehensiveIncome>
    <ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings contextRef="c-14" decimals="-3" id="f-180" unitRef="eur">-115192000</ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings>
    <ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings contextRef="c-13" decimals="-3" id="f-181" unitRef="eur">115192000</ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings>
    <ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings contextRef="c-1" decimals="-3" id="f-182" unitRef="eur">0</ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings>
    <valn:IncreaseDecreaseThroughShareBasedPaymentTransactionsValueOfServicesEquity contextRef="c-12" decimals="-3" id="f-183" unitRef="eur">1880000</valn:IncreaseDecreaseThroughShareBasedPaymentTransactionsValueOfServicesEquity>
    <valn:IncreaseDecreaseThroughShareBasedPaymentTransactionsValueOfServicesEquity contextRef="c-1" decimals="-3" id="f-184" unitRef="eur">1880000</valn:IncreaseDecreaseThroughShareBasedPaymentTransactionsValueOfServicesEquity>
    <ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions contextRef="c-15" decimals="-3" id="f-185" unitRef="eur">51000</ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions>
    <ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions contextRef="c-16" decimals="-3" id="f-186" unitRef="eur">881000</ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions>
    <ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions contextRef="c-1" decimals="-3" id="f-187" unitRef="eur">931000</ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions>
    <ifrs-full:Equity contextRef="c-17" decimals="-3" id="f-188" unitRef="eur">26082000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-18" decimals="-3" id="f-189" unitRef="eur">676820000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-19" decimals="-3" id="f-190" unitRef="eur">84991000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-20" decimals="-3" id="f-191" unitRef="eur">-679121000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-21" decimals="-3" id="f-192" unitRef="eur">-32073000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-3" decimals="-3" id="f-193" unitRef="eur">76699000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-22" decimals="-3" id="f-194" unitRef="eur">24378000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-23" decimals="-3" id="f-195" unitRef="eur">647600000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-24" decimals="-3" id="f-196" unitRef="eur">73203000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-25" decimals="-3" id="f-197" unitRef="eur">-551682000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-26" decimals="-3" id="f-198" unitRef="eur">-12247000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-5" decimals="-3" id="f-199" unitRef="eur">181253000</ifrs-full:Equity>
    <ifrs-full:ComprehensiveIncome contextRef="c-27" decimals="-3" id="f-200" unitRef="eur">983000</ifrs-full:ComprehensiveIncome>
    <ifrs-full:ComprehensiveIncome contextRef="c-28" decimals="-3" id="f-201" unitRef="eur">-9232000</ifrs-full:ComprehensiveIncome>
    <ifrs-full:ComprehensiveIncome contextRef="c-2" decimals="-3" id="f-202" unitRef="eur">-8249000</ifrs-full:ComprehensiveIncome>
    <ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings contextRef="c-29" decimals="-3" id="f-203" unitRef="eur">-12247000</ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings>
    <ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings contextRef="c-28" decimals="-3" id="f-204" unitRef="eur">12247000</ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings>
    <ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings contextRef="c-2" decimals="-3" id="f-205" unitRef="eur">0</ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings>
    <valn:IncreaseDecreaseThroughShareBasedPaymentTransactionsValueOfServicesEquity contextRef="c-27" decimals="-3" id="f-206" unitRef="eur">2249000</valn:IncreaseDecreaseThroughShareBasedPaymentTransactionsValueOfServicesEquity>
    <valn:IncreaseDecreaseThroughShareBasedPaymentTransactionsValueOfServicesEquity contextRef="c-2" decimals="-3" id="f-207" unitRef="eur">2249000</valn:IncreaseDecreaseThroughShareBasedPaymentTransactionsValueOfServicesEquity>
    <ifrs-full:Equity contextRef="c-30" decimals="-3" id="f-208" unitRef="eur">24378000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-31" decimals="-3" id="f-209" unitRef="eur">647600000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-32" decimals="-3" id="f-210" unitRef="eur">76434000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-33" decimals="-3" id="f-211" unitRef="eur">-563928000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-34" decimals="-3" id="f-212" unitRef="eur">-9232000</ifrs-full:Equity>
    <ifrs-full:Equity contextRef="c-6" decimals="-3" id="f-213" unitRef="eur">175253000</ifrs-full:Equity>
    <link:footnoteLink
      xlink:role="http://www.xbrl.org/2003/role/link"
      xlink:type="extended">
        <link:loc
          xlink:href="#f-157"
          xlink:label="f-157"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#f-158"
          xlink:label="f-158"
          xlink:type="locator"/>
        <link:footnote id="fn-1" xlink:label="fn-1" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="color:#626262;font-family:'Gotham Light',sans-serif;font-size:8pt;font-weight:400;line-height:120%"> </xhtml:span><xhtml:span style="color:#626262;font-family:'Gotham Light',sans-serif;font-size:6.5pt;font-style:italic;font-weight:400;line-height:120%">(1) </xhtml:span>Cash flows relating to the interest on the lease liabilities amounted to &#x20ac;0.2&#160;million as at March&#160;31, 2026 (2025: &#x20ac;0.2&#160;million)</link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="f-157"
          xlink:to="fn-1"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="f-158"
          xlink:to="fn-1"
          xlink:type="arc"/>
    </link:footnoteLink>
</xbrl>
