<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>1242</ContextCount>
  <ElementCount>600</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>293</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>21</UnitCount>
  <MyReports>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995200090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995200100 - Statement - Consolidated statements of profit or loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/StatementConsolidatedStatementsOfProfitOrLoss</Role>
      <ShortName>Consolidated statements of profit or loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995200105 - Statement - Consolidated statements of profit or loss (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/StatementConsolidatedStatementsOfProfitOrLossParenthetical</Role>
      <ShortName>Consolidated statements of profit or loss (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995200200 - Statement - Consolidated statements of comprehensive loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/StatementConsolidatedStatementsOfComprehensiveLoss</Role>
      <ShortName>Consolidated statements of comprehensive loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>995200300 - Statement - Consolidated statements of financial position</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/StatementConsolidatedStatementsOfFinancialPosition</Role>
      <ShortName>Consolidated statements of financial position</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995200305 - Statement - Consolidated statements of financial position (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/StatementConsolidatedStatementsOfFinancialPositionParenthetical</Role>
      <ShortName>Consolidated statements of financial position (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995200400 - Statement - Consolidated statements of cash flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated statements of cash flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995200500 - Statement - Consolidated statements of changes in equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/StatementConsolidatedStatementsOfChangesInEquity</Role>
      <ShortName>Consolidated statements of changes in equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995200505 - Statement - Consolidated statements of changes in equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/StatementConsolidatedStatementsOfChangesInEquityParenthetical</Role>
      <ShortName>Consolidated statements of changes in equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995210101 - Disclosure - General information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureGeneralInformation</Role>
      <ShortName>General information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995210201 - Disclosure - Basis of preparation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureBasisOfPreparation</Role>
      <ShortName>Basis of preparation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995210301 - Disclosure - Summary of significant accounting policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of significant accounting policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995210401 - Disclosure - Financial risk management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinancialRiskManagement</Role>
      <ShortName>Financial risk management</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995210501 - Disclosure - Use of estimates</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureUseOfEstimates</Role>
      <ShortName>Use of estimates</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995210601 - Disclosure - Segment reporting</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSegmentReporting</Role>
      <ShortName>Segment reporting</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995210701 - Disclosure - Revenue</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRevenue</Role>
      <ShortName>Revenue</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995210801 - Disclosure - Expenses by nature</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureExpensesByNature</Role>
      <ShortName>Expenses by nature</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995210901 - Disclosure - Non-underlying items</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNonUnderlyingItems</Role>
      <ShortName>Non-underlying items</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995211001 - Disclosure - Finance cost - net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinanceCostNet</Role>
      <ShortName>Finance cost - net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995211101 - Disclosure - Income tax benefits / (expenses)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpenses</Role>
      <ShortName>Income tax benefits / (expenses)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995211201 - Disclosure - Discontinued operations, assets held for sale and liabilities associated with assets held for sale</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureDiscontinuedOperationsAssetsHeldForSaleAndLiabilitiesAssociatedWithAssetsHeldForSale</Role>
      <ShortName>Discontinued operations, assets held for sale and liabilities associated with assets held for sale</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995211301 - Disclosure - Loss per share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureLossPerShare</Role>
      <ShortName>Loss per share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995211401 - Disclosure - Intangible assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureIntangibleAssets</Role>
      <ShortName>Intangible assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995211501 - Disclosure - Goodwill</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureGoodwill</Role>
      <ShortName>Goodwill</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995211601 - Disclosure - Impairment testing of intangible assets with indefinite useful lives</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureImpairmentTestingOfIntangibleAssetsWithIndefiniteUsefulLives</Role>
      <ShortName>Impairment testing of intangible assets with indefinite useful lives</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995211701 - Disclosure - Property, plant and equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosurePropertyPlantAndEquipment</Role>
      <ShortName>Property, plant and equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995211801 - Disclosure - Right-of-use assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRightOfUseAssets</Role>
      <ShortName>Right-of-use assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995211901 - Disclosure - Other non-current assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherNonCurrentAssets</Role>
      <ShortName>Other non-current assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995212001 - Disclosure - Inventories</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureInventories</Role>
      <ShortName>Inventories</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995212101 - Disclosure - Trade receivables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureTradeReceivables</Role>
      <ShortName>Trade receivables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995212201 - Disclosure - Other current assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentAssets</Role>
      <ShortName>Other current assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995212301 - Disclosure - Cash and bank balances</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureCashAndBankBalances</Role>
      <ShortName>Cash and bank balances</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995212401 - Disclosure - Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureBorrowings</Role>
      <ShortName>Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995212501 - Disclosure - Lease liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureLeaseLiabilities</Role>
      <ShortName>Lease liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995212601 - Disclosure - Provisions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureProvisions</Role>
      <ShortName>Provisions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995212701 - Disclosure - Employee benefits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureEmployeeBenefits</Role>
      <ShortName>Employee benefits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995212801 - Disclosure - Other current liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentLiabilities</Role>
      <ShortName>Other current liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995212901 - Disclosure - Share capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureShareCapital</Role>
      <ShortName>Share capital</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995213001 - Disclosure - Other reserve</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherReserve</Role>
      <ShortName>Other reserve</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995213101 - Disclosure - Non-controlling interests</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNonControllingInterests</Role>
      <ShortName>Non-controlling interests</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995213201 - Disclosure - Share-based payment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureShareBasedPayment</Role>
      <ShortName>Share-based payment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995213301 - Disclosure - Related party transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>Related party transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995213401 - Disclosure - Notes to consolidated statements of cash flows</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNotesToConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Notes to consolidated statements of cash flows</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995213501 - Disclosure - Subsequent events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSubsequentEvents</Role>
      <ShortName>Subsequent events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>99920302 - Disclosure - Summary of significant accounting policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of significant accounting policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>99930303 - Disclosure - Summary of significant accounting policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of significant accounting policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>99930403 - Disclosure - Financial risk management (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinancialRiskManagementTables</Role>
      <ShortName>Financial risk management (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureFinancialRiskManagement</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>99930603 - Disclosure - Segment reporting (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSegmentReportingTables</Role>
      <ShortName>Segment reporting (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureSegmentReporting</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>99930703 - Disclosure - Revenue (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRevenueTables</Role>
      <ShortName>Revenue (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureRevenue</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>99930803 - Disclosure - Expenses by nature (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureExpensesByNatureTables</Role>
      <ShortName>Expenses by nature (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureExpensesByNature</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>99930903 - Disclosure - Non-underlying items (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNonUnderlyingItemsTables</Role>
      <ShortName>Non-underlying items (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureNonUnderlyingItems</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>99931003 - Disclosure - Finance cost - net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinanceCostNetTables</Role>
      <ShortName>Finance cost - net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureFinanceCostNet</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>99931103 - Disclosure - Income tax benefits / (expenses) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesTables</Role>
      <ShortName>Income tax benefits / (expenses) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpenses</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>99931203 - Disclosure - Discontinued operations, assets held for sale and liabilities associated with assets held for sale (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureDiscontinuedOperationsAssetsHeldForSaleAndLiabilitiesAssociatedWithAssetsHeldForSaleTables</Role>
      <ShortName>Discontinued operations, assets held for sale and liabilities associated with assets held for sale (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureDiscontinuedOperationsAssetsHeldForSaleAndLiabilitiesAssociatedWithAssetsHeldForSale</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>99931303 - Disclosure - Loss per share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureLossPerShareTables</Role>
      <ShortName>Loss per share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureLossPerShare</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>99931403 - Disclosure - Intangible assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureIntangibleAssetsTables</Role>
      <ShortName>Intangible assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureIntangibleAssets</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>99931503 - Disclosure - Goodwill (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureGoodwillTables</Role>
      <ShortName>Goodwill (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureGoodwill</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>99931603 - Disclosure - Impairment testing of intangible assets with indefinite useful lives (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureImpairmentTestingOfIntangibleAssetsWithIndefiniteUsefulLivesTables</Role>
      <ShortName>Impairment testing of intangible assets with indefinite useful lives (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureImpairmentTestingOfIntangibleAssetsWithIndefiniteUsefulLives</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>99931703 - Disclosure - Property, plant and equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosurePropertyPlantAndEquipmentTables</Role>
      <ShortName>Property, plant and equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosurePropertyPlantAndEquipment</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>99931803 - Disclosure - Right-of-use assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRightOfUseAssetsTables</Role>
      <ShortName>Right-of-use assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureRightOfUseAssets</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>99931903 - Disclosure - Other non-current assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherNonCurrentAssetsTables</Role>
      <ShortName>Other non-current assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureOtherNonCurrentAssets</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>99932003 - Disclosure - Inventories (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureInventoriesTables</Role>
      <ShortName>Inventories (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureInventories</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>99932103 - Disclosure - Trade receivables (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureTradeReceivablesTables</Role>
      <ShortName>Trade receivables (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureTradeReceivables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>99932203 - Disclosure - Other current assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentAssetsTables</Role>
      <ShortName>Other current assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentAssets</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>99932303 - Disclosure - Cash and bank balances (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureCashAndBankBalancesTables</Role>
      <ShortName>Cash and bank balances (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureCashAndBankBalances</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>99932403 - Disclosure - Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureBorrowingsTables</Role>
      <ShortName>Borrowings (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureBorrowings</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>99932503 - Disclosure - Lease liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureLeaseLiabilitiesTables</Role>
      <ShortName>Lease liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureLeaseLiabilities</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>99932603 - Disclosure - Provisions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureProvisionsTables</Role>
      <ShortName>Provisions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureProvisions</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>99932703 - Disclosure - Employee benefits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureEmployeeBenefitsTables</Role>
      <ShortName>Employee benefits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureEmployeeBenefits</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>99932803 - Disclosure - Other current liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentLiabilitiesTables</Role>
      <ShortName>Other current liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentLiabilities</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>99932903 - Disclosure - Share capital (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureShareCapitalTables</Role>
      <ShortName>Share capital (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureShareCapital</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>99933003 - Disclosure - Other reserve (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherReserveTables</Role>
      <ShortName>Other reserve (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureOtherReserve</ParentRole>
      <Position>74</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>99933103 - Disclosure - Non-controlling interests (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNonControllingInterestsTables</Role>
      <ShortName>Non-controlling interests (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureNonControllingInterests</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>99933203 - Disclosure - Share-based payment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureShareBasedPaymentTables</Role>
      <ShortName>Share-based payment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureShareBasedPayment</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>99933303 - Disclosure - Related party transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRelatedPartyTransactionsTables</Role>
      <ShortName>Related party transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureRelatedPartyTransactions</ParentRole>
      <Position>77</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>99933403 - Disclosure - Notes to consolidated statements of cash flows (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNotesToConsolidatedStatementsOfCashFlowsTables</Role>
      <ShortName>Notes to consolidated statements of cash flows (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureNotesToConsolidatedStatementsOfCashFlows</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>99940201 - Disclosure - Basis of preparation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureBasisOfPreparationDetails</Role>
      <ShortName>Basis of preparation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureBasisOfPreparation</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>99940301 - Disclosure - Summary of significant accounting policies - Summary of new standards, amendments and interpretations not yet effective (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfNewStandardsAmendmentsAndInterpretationsNotYetEffectiveDetails</Role>
      <ShortName>Summary of significant accounting policies - Summary of new standards, amendments and interpretations not yet effective (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>99940302 - Disclosure - Summary of significant accounting policies - Summary of principal foreign currency exchange rates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfPrincipalForeignCurrencyExchangeRatesDetails</Role>
      <ShortName>Summary of significant accounting policies - Summary of principal foreign currency exchange rates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>99940303 - Disclosure - Summary of significant accounting policies - Summary of scope of consolidation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfScopeOfConsolidationDetails</Role>
      <ShortName>Summary of significant accounting policies - Summary of scope of consolidation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>99940304 - Disclosure - Summary of significant accounting policies - Summary of depreciation over the estimated useful lives of the assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfDepreciationOverEstimatedUsefulLivesOfAssetsDetails</Role>
      <ShortName>Summary of significant accounting policies - Summary of depreciation over the estimated useful lives of the assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>99940305 - Disclosure - Summary of significant accounting policies - Summary of intangible assets with a definite useful life (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSummaryOfSignificantAccountingPoliciesSummaryOfIntangibleAssetsWithDefiniteUsefulLifeDetails</Role>
      <ShortName>Summary of significant accounting policies - Summary of intangible assets with a definite useful life (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>99940306 - Disclosure - Summary of significant accounting policies - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails</Role>
      <ShortName>Summary of significant accounting policies - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>99940401 - Disclosure - Financial risk management - Summary of assets and liabilities that are measured at fair value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinancialRiskManagementSummaryOfAssetsAndLiabilitiesThatAreMeasuredAtFairValueDetails</Role>
      <ShortName>Financial risk management - Summary of assets and liabilities that are measured at fair value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>99940402 - Disclosure - Financial risk management - Sensitivity analysis of possible change in the main foreign currencies against the Euro (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinancialRiskManagementSensitivityAnalysisOfPossibleChangeInMainForeignCurrenciesAgainstEuroDetails</Role>
      <ShortName>Financial risk management - Sensitivity analysis of possible change in the main foreign currencies against the Euro (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>99940403 - Disclosure - Financial risk management - Sensitivity analysis of reasonably possible change in interest rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinancialRiskManagementSensitivityAnalysisOfReasonablyPossibleChangeInInterestRateDetails</Role>
      <ShortName>Financial risk management - Sensitivity analysis of reasonably possible change in interest rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>99940404 - Disclosure - Financial risk management - Trade receivables, credit risk management (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinancialRiskManagementTradeReceivablesCreditRiskManagementDetails</Role>
      <ShortName>Financial risk management - Trade receivables, credit risk management (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>99940405 - Disclosure - Financial risk management - Maturity analysis for financial liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinancialRiskManagementMaturityAnalysisForFinancialLiabilitiesDetails</Role>
      <ShortName>Financial risk management - Maturity analysis for financial liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>99940406 - Disclosure - Financial risk management - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinancialRiskManagementAdditionalInformationDetails</Role>
      <ShortName>Financial risk management - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>99940601 - Disclosure - Segment reporting - Summary of financial information by segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSegmentReportingSummaryOfFinancialInformationBySegmentDetails</Role>
      <ShortName>Segment reporting - Summary of financial information by segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>99940602 - Disclosure - Segment reporting - Summary of non-current assets by geography (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSegmentReportingSummaryOfNonCurrentAssetsByGeographyDetails</Role>
      <ShortName>Segment reporting - Summary of non-current assets by geography (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>99940701 - Disclosure - Revenue - Summary of revenue by sales channel (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRevenueSummaryOfRevenueBySalesChannelDetails</Role>
      <ShortName>Revenue - Summary of revenue by sales channel (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>99940702 - Disclosure - Revenue - Summary of revenue by geographic area (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRevenueSummaryOfRevenueByGeographicAreaDetails</Role>
      <ShortName>Revenue - Summary of revenue by geographic area (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>99940801 - Disclosure - Expenses by nature - Summary of total expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureExpensesByNatureSummaryOfTotalExpensesDetails</Role>
      <ShortName>Expenses by nature - Summary of total expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>99940802 - Disclosure - Expenses by nature - Summary of personnel costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureExpensesByNatureSummaryOfPersonnelCostsDetails</Role>
      <ShortName>Expenses by nature - Summary of personnel costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>99940803 - Disclosure - Expenses by nature - Summary of lease expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureExpensesByNatureSummaryOfLeaseExpensesDetails</Role>
      <ShortName>Expenses by nature - Summary of lease expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>99940804 - Disclosure - Expenses by nature - Summary of provisions and impairment losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureExpensesByNatureSummaryOfProvisionsAndImpairmentLossesDetails</Role>
      <ShortName>Expenses by nature - Summary of provisions and impairment losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>99940901 - Disclosure - Non-underlying items - Summary of non-underlying items (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNonUnderlyingItemsSummaryOfNonUnderlyingItemsDetails</Role>
      <ShortName>Non-underlying items - Summary of non-underlying items (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>99941001 - Disclosure - Finance cost - net - Summary of finance cost - net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureFinanceCostNetSummaryOfFinanceCostNetDetails</Role>
      <ShortName>Finance cost - net - Summary of finance cost - net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>99941101 - Disclosure - Income tax benefits / (expenses) - Summary of income tax (expenses) / benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesSummaryOfIncomeTaxExpensesBenefitsDetails</Role>
      <ShortName>Income tax benefits / (expenses) - Summary of income tax (expenses) / benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesTables</ParentRole>
      <Position>102</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>99941102 - Disclosure - Income tax benefits / (expenses) - Summary of effective tax rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesSummaryOfEffectiveTaxRateDetails</Role>
      <ShortName>Income tax benefits / (expenses) - Summary of effective tax rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesTables</ParentRole>
      <Position>103</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>99941103 - Disclosure - Income tax benefits / (expenses) - Summary of Group's theoretical tax and its income taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesSummaryOfGroupSTheoreticalTaxAndItsIncomeTaxesDetails</Role>
      <ShortName>Income tax benefits / (expenses) - Summary of Group's theoretical tax and its income taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesTables</ParentRole>
      <Position>104</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>99941104 - Disclosure - Income tax benefits / (expenses) - Summary of deferred tax assets and deferred tax liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesSummaryOfDeferredTaxAssetsAndDeferredTaxLiabilitiesDetails</Role>
      <ShortName>Income tax benefits / (expenses) - Summary of deferred tax assets and deferred tax liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesTables</ParentRole>
      <Position>105</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>99941105 - Disclosure - Income tax benefits / (expenses) - Summary of tax losses carried forward (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesSummaryOfTaxLossesCarriedForwardDetails</Role>
      <ShortName>Income tax benefits / (expenses) - Summary of tax losses carried forward (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureIncomeTaxBenefitsExpensesTables</ParentRole>
      <Position>106</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>99941201 - Disclosure - Discontinued operations, assets held for sale and liabilities associated with assets held for sale - Sale of the Caruso Brand (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureDiscontinuedOperationsAssetsHeldForSaleAndLiabilitiesAssociatedWithAssetsHeldForSaleSaleOfCarusoBrandDetails</Role>
      <ShortName>Discontinued operations, assets held for sale and liabilities associated with assets held for sale - Sale of the Caruso Brand (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>99941202 - Disclosure - Discontinued operations, assets held for sale and liabilities associated with assets held for sale - Held for sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureDiscontinuedOperationsAssetsHeldForSaleAndLiabilitiesAssociatedWithAssetsHeldForSaleHeldForSaleDetails</Role>
      <ShortName>Discontinued operations, assets held for sale and liabilities associated with assets held for sale - Held for sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureDiscontinuedOperationsAssetsHeldForSaleAndLiabilitiesAssociatedWithAssetsHeldForSaleTables</ParentRole>
      <Position>108</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>99941301 - Disclosure - Loss per share - Summary of basic and diluted net loss per share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureLossPerShareSummaryOfBasicAndDilutedNetLossPerShareDetails</Role>
      <ShortName>Loss per share - Summary of basic and diluted net loss per share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>99941302 - Disclosure - Loss per share - Summary of outstanding shares of potentially dilutive securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureLossPerShareSummaryOfOutstandingSharesOfPotentiallyDilutiveSecuritiesDetails</Role>
      <ShortName>Loss per share - Summary of outstanding shares of potentially dilutive securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>99941401 - Disclosure - Intangible assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureIntangibleAssetsDetails</Role>
      <ShortName>Intangible assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureIntangibleAssetsTables</ParentRole>
      <Position>111</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>99941501 - Disclosure - Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureGoodwillDetails</Role>
      <ShortName>Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureGoodwillTables</ParentRole>
      <Position>112</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>99941601 - Disclosure - Impairment testing of intangible assets with indefinite useful lives - Summary of the intangible assets with indefinite useful lives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureImpairmentTestingOfIntangibleAssetsWithIndefiniteUsefulLivesSummaryOfIntangibleAssetsWithIndefiniteUsefulLivesDetails</Role>
      <ShortName>Impairment testing of intangible assets with indefinite useful lives - Summary of the intangible assets with indefinite useful lives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>113</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>99941602 - Disclosure - Impairment testing of intangible assets with indefinite useful lives - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureImpairmentTestingOfIntangibleAssetsWithIndefiniteUsefulLivesAdditionalInformationDetails</Role>
      <ShortName>Impairment testing of intangible assets with indefinite useful lives - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>99941701 - Disclosure - Property, plant and equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosurePropertyPlantAndEquipmentDetails</Role>
      <ShortName>Property, plant and equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosurePropertyPlantAndEquipmentTables</ParentRole>
      <Position>115</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>99941801 - Disclosure - Right-of-use assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRightOfUseAssetsDetails</Role>
      <ShortName>Right-of-use assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureRightOfUseAssetsTables</ParentRole>
      <Position>116</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>99941901 - Disclosure - Other non-current assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherNonCurrentAssetsDetails</Role>
      <ShortName>Other non-current assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureOtherNonCurrentAssetsTables</ParentRole>
      <Position>117</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>99941902 - Disclosure - Other non-current assets - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherNonCurrentAssetsAdditionalInformationDetails</Role>
      <ShortName>Other non-current assets - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>99942001 - Disclosure - Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureInventoriesDetails</Role>
      <ShortName>Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureInventoriesTables</ParentRole>
      <Position>119</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>99942002 - Disclosure - Inventories - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureInventoriesAdditionalInformationDetails</Role>
      <ShortName>Inventories - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>99942101 - Disclosure - Trade receivables - Summary of trade receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureTradeReceivablesSummaryOfTradeReceivablesDetails</Role>
      <ShortName>Trade receivables - Summary of trade receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>121</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R122.htm</HtmlFileName>
      <LongName>99942102 - Disclosure - Trade receivables - Summary of breakdown for the loss allowance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureTradeReceivablesSummaryOfBreakdownForLossAllowanceDetails</Role>
      <ShortName>Trade receivables - Summary of breakdown for the loss allowance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>122</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R123.htm</HtmlFileName>
      <LongName>99942103 - Disclosure - Trade receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureTradeReceivablesDetails</Role>
      <ShortName>Trade receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureTradeReceivablesTables</ParentRole>
      <Position>123</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R124.htm</HtmlFileName>
      <LongName>99942201 - Disclosure - Other current assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentAssetsDetails</Role>
      <ShortName>Other current assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentAssetsTables</ParentRole>
      <Position>124</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R125.htm</HtmlFileName>
      <LongName>99942301 - Disclosure - Cash and bank balances - Summary of cash and bank balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureCashAndBankBalancesSummaryOfCashAndBankBalancesDetails</Role>
      <ShortName>Cash and bank balances - Summary of cash and bank balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>125</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R126.htm</HtmlFileName>
      <LongName>99942401 - Disclosure - Borrowings - Summary of breakdown for non-current and current borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureBorrowingsSummaryOfBreakdownForNonCurrentAndCurrentBorrowingsDetails</Role>
      <ShortName>Borrowings - Summary of breakdown for non-current and current borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>126</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R127.htm</HtmlFileName>
      <LongName>99942402 - Disclosure - Borrowings - Summary of assets pledged as security (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureBorrowingsSummaryOfAssetsPledgedAsSecurityDetails</Role>
      <ShortName>Borrowings - Summary of assets pledged as security (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>127</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R128.htm</HtmlFileName>
      <LongName>99942403 - Disclosure - Borrowings - Summary of main terms of the borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureBorrowingsSummaryOfMainTermsOfBorrowingsDetails</Role>
      <ShortName>Borrowings - Summary of main terms of the borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>128</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R129.htm</HtmlFileName>
      <LongName>99942404 - Disclosure - Borrowings - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureBorrowingsAdditionalInformationDetails</Role>
      <ShortName>Borrowings - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>129</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R130.htm</HtmlFileName>
      <LongName>99942501 - Disclosure - Lease liabilities - Schedule of lease liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureLeaseLiabilitiesScheduleOfLeaseLiabilitiesDetails</Role>
      <ShortName>Lease liabilities - Schedule of lease liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>130</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R131.htm</HtmlFileName>
      <LongName>99942502 - Disclosure - Lease liabilities - Disclosure of maturity analysis of operating lease payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureLeaseLiabilitiesDisclosureOfMaturityAnalysisOfOperatingLeasePaymentsDetails</Role>
      <ShortName>Lease liabilities - Disclosure of maturity analysis of operating lease payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>131</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R132.htm</HtmlFileName>
      <LongName>99942601 - Disclosure - Provisions - Summary of movement of the provisions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureProvisionsSummaryOfMovementOfProvisionsDetails</Role>
      <ShortName>Provisions - Summary of movement of the provisions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>132</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R133.htm</HtmlFileName>
      <LongName>99942602 - Disclosure - Provisions - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureProvisionsAdditionalInformationDetails</Role>
      <ShortName>Provisions - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>133</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R134.htm</HtmlFileName>
      <LongName>99942701 - Disclosure - Employee benefits - Schedule of employee benefits of the Group (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureEmployeeBenefitsScheduleOfEmployeeBenefitsOfGroupDetails</Role>
      <ShortName>Employee benefits - Schedule of employee benefits of the Group (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>134</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R135.htm</HtmlFileName>
      <LongName>99942702 - Disclosure - Employee benefits - Schedule of changes in long-term employee benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureEmployeeBenefitsScheduleOfChangesInLongTermEmployeeBenefitsDetails</Role>
      <ShortName>Employee benefits - Schedule of changes in long-term employee benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>135</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R136.htm</HtmlFileName>
      <LongName>99942703 - Disclosure - Employee benefits - Schedule of defined-benefit obligations by type of benefit plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureEmployeeBenefitsScheduleOfDefinedBenefitObligationsByTypeOfBenefitPlanDetails</Role>
      <ShortName>Employee benefits - Schedule of defined-benefit obligations by type of benefit plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>136</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R137.htm</HtmlFileName>
      <LongName>99942704 - Disclosure - Employee benefits - Schedule of fair value of defined-benefit plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureEmployeeBenefitsScheduleOfFairValueOfDefinedBenefitPlansDetails</Role>
      <ShortName>Employee benefits - Schedule of fair value of defined-benefit plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>137</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R138.htm</HtmlFileName>
      <LongName>99942705 - Disclosure - Employee benefits - Schedule of composition of the main plan assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureEmployeeBenefitsScheduleOfCompositionOfMainPlanAssetsDetails</Role>
      <ShortName>Employee benefits - Schedule of composition of the main plan assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>138</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R139.htm</HtmlFileName>
      <LongName>99942706 - Disclosure - Employee benefits - Schedule of main actuarial assumptions used (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureEmployeeBenefitsScheduleOfMainActuarialAssumptionsUsedDetails</Role>
      <ShortName>Employee benefits - Schedule of main actuarial assumptions used (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>139</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R140.htm</HtmlFileName>
      <LongName>99942707 - Disclosure - Employee benefits - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureEmployeeBenefitsAdditionalInformationDetails</Role>
      <ShortName>Employee benefits - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>140</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R141.htm</HtmlFileName>
      <LongName>99942801 - Disclosure - Other current liabilities - Summary of other current liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentLiabilitiesSummaryOfOtherCurrentLiabilitiesDetails</Role>
      <ShortName>Other current liabilities - Summary of other current liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>141</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R142.htm</HtmlFileName>
      <LongName>99942802 - Disclosure - Other current liabilities - Summary of warrant liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentLiabilitiesSummaryOfWarrantLiabilitiesDetails</Role>
      <ShortName>Other current liabilities - Summary of warrant liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>142</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R143.htm</HtmlFileName>
      <LongName>99942803 - Disclosure - Other current liabilities - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherCurrentLiabilitiesAdditionalInformationDetails</Role>
      <ShortName>Other current liabilities - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>143</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R144.htm</HtmlFileName>
      <LongName>99942901 - Disclosure - Share capital - Movements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureShareCapitalMovementsDetails</Role>
      <ShortName>Share capital - Movements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>144</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R145.htm</HtmlFileName>
      <LongName>99942902 - Disclosure - Share capital (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureShareCapitalDetails</Role>
      <ShortName>Share capital (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureShareCapitalTables</ParentRole>
      <Position>145</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R146.htm</HtmlFileName>
      <LongName>99942903 - Disclosure - Share capital - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureShareCapitalAdditionalInformationDetails</Role>
      <ShortName>Share capital - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>146</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R147.htm</HtmlFileName>
      <LongName>99943001 - Disclosure - Other reserve - Summary of other reserve (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureOtherReserveSummaryOfOtherReserveDetails</Role>
      <ShortName>Other reserve - Summary of other reserve (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>147</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R148.htm</HtmlFileName>
      <LongName>99943101 - Disclosure - Non-controlling interests - Summary of non-controlling interests (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNonControllingInterestsSummaryOfNonControllingInterestsDetails</Role>
      <ShortName>Non-controlling interests - Summary of non-controlling interests (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>148</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R149.htm</HtmlFileName>
      <LongName>99943201 - Disclosure - Share-based payment - Summary of number of shares granted and weighted average exercise prices (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureShareBasedPaymentSummaryOfNumberOfSharesGrantedAndWeightedAverageExercisePricesDetails</Role>
      <ShortName>Share-based payment - Summary of number of shares granted and weighted average exercise prices (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>149</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R150.htm</HtmlFileName>
      <LongName>99943202 - Disclosure - Share-based payment - Summary of RSUs and SEBIRs outstanding and exercise prices (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureShareBasedPaymentSummaryOfRsusAndSebirsOutstandingAndExercisePricesDetails</Role>
      <ShortName>Share-based payment - Summary of RSUs and SEBIRs outstanding and exercise prices (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>150</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R151.htm</HtmlFileName>
      <LongName>99943203 - Disclosure - Share-based payment - Additional information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureShareBasedPaymentAdditionalInformationDetails</Role>
      <ShortName>Share-based payment - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>151</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R152.htm</HtmlFileName>
      <LongName>99943301 - Disclosure - Related party transactions - Summary of information about key management personnel (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRelatedPartyTransactionsSummaryOfInformationAboutKeyManagementPersonnelDetails</Role>
      <ShortName>Related party transactions - Summary of information about key management personnel (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>152</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R153.htm</HtmlFileName>
      <LongName>99943302 - Disclosure - Related party transactions - Summary of transactions with related parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureRelatedPartyTransactionsSummaryOfTransactionsWithRelatedPartiesDetails</Role>
      <ShortName>Related party transactions - Summary of transactions with related parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>153</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R154.htm</HtmlFileName>
      <LongName>99943401 - Disclosure - Notes to consolidated statements of cash flows - Additional information (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNotesToConsolidatedStatementsOfCashFlowsAdditionalInformationDetails</Role>
      <ShortName>Notes to consolidated statements of cash flows - Additional information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>154</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R155.htm</HtmlFileName>
      <LongName>99943402 - Disclosure - Notes to consolidated statements of cash flows - Summary of proceeds from disposal of long-term assets (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNotesToConsolidatedStatementsOfCashFlowsSummaryOfProceedsFromDisposalOfLongTermAssetsDetails</Role>
      <ShortName>Notes to consolidated statements of cash flows - Summary of proceeds from disposal of long-term assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>155</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R156.htm</HtmlFileName>
      <LongName>99943403 - Disclosure - Notes to consolidated statements of cash flows - Summary of changes in liabilities arising from financing activities (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNotesToConsolidatedStatementsOfCashFlowsSummaryOfChangesInLiabilitiesArisingFromFinancingActivitiesDetails</Role>
      <ShortName>Notes to consolidated statements of cash flows - Summary of changes in liabilities arising from financing activities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>156</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R157.htm</HtmlFileName>
      <LongName>99943404 - Disclosure - Notes to consolidated statements of cash flows - Summary of total cash outflow for leases (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureNotesToConsolidatedStatementsOfCashFlowsSummaryOfTotalCashOutflowForLeasesDetails</Role>
      <ShortName>Notes to consolidated statements of cash flows - Summary of total cash outflow for leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>157</Position>
    </Report>
    <Report instance="lanv-20251231x20f.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R158.htm</HtmlFileName>
      <LongName>99943501 - Disclosure - Subsequent events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lanvin-group.com/20231231/role/DisclosureSubsequentEventsDetails</Role>
      <ShortName>Subsequent events (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lanvin-group.com/20231231/role/DisclosureSubsequentEvents</ParentRole>
      <Position>158</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>lanv-20251231.xsd</File>
    <File>lanv-20251231_cal.xml</File>
    <File>lanv-20251231_def.xml</File>
    <File>lanv-20251231_lab.xml</File>
    <File>lanv-20251231_pre.xml</File>
    <File doctype="20-F" isDefinitelyFs="true" isIfrs="true" isUsgaap="true" original="lanv-20251231x20f.htm">lanv-20251231x20f.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>lanv-20251231x20f009.jpg</File>
    <File>lanv-20251231x20f027.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="50">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="1">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
    <BaseTaxonomy items="2615">https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>