{
 "documentInfo": {
  "documentType": "https://xbrl.org/2021/xbrl-json",
  "features": {
   "xbrl:canonicalValues": true
  },
  "namespaces": {
   "ifrs-full": "http://xbrl.ifrs.org/taxonomy/2020-03-16/ifrs-full",
   "iso4217": "http://www.xbrl.org/2003/iso4217",
   "mersen": "http://www.mersen.com/taxonomy/2019-12-31/mersen_full_entry_point",
   "scheme": "http://standards.iso.org/iso/17442",
   "xbrl": "https://xbrl.org/2021",
   "xbrli": "http://www.xbrl.org/2003/instance"
  },
  "taxonomy": [
   "http://www.mersen.com/taxonomy/2019-12-31/MERSEN-2021-12-31.xsd"
  ]
 },
 "facts": {
  "fact_25384": {
   "value": "MERSEN",
   "dimensions": {
    "concept": "ifrs-full:NameOfReportingEntityOrOtherMeansOfIdentification",
    "language": "fr",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact_25390": {
   "value": "MERSEN",
   "dimensions": {
    "concept": "ifrs-full:NameOfParentEntity",
    "language": "fr",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact_25391": {
   "value": "MERSEN",
   "dimensions": {
    "concept": "ifrs-full:NameOfUltimateParentOfGroup",
    "language": "fr",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact_25385": {
   "value": "Soci\u00e9t\u00e9 Anonyme \u00e0 Conseil d\u2019Administration de droit fran\u00e7ais",
   "dimensions": {
    "concept": "ifrs-full:LegalFormOfEntity",
    "language": "fr",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact_25386": {
   "value": "Tour Trinity  1 bis place de la D\u00e9fense  92400 Courbevoie (France)",
   "dimensions": {
    "concept": "ifrs-full:AddressOfRegisteredOfficeOfEntity",
    "language": "fr",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact_25387": {
   "value": "Tour Trinity  1 bis place de la D\u00e9fense  92400 Courbevoie (France)",
   "dimensions": {
    "concept": "ifrs-full:PrincipalPlaceOfBusiness",
    "language": "fr",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact_25388": {
   "value": "France",
   "dimensions": {
    "concept": "ifrs-full:CountryOfIncorporation",
    "language": "fr",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact_25389": {
   "value": "France",
   "dimensions": {
    "concept": "ifrs-full:DomicileOfEntity",
    "language": "fr",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact_25392": {
   "value": "La Soci\u00e9t\u00e9 a pour objet, en France et dans tous les autres pays,  l\u2019accomplissement de toutes op\u00e9rations concernant l\u2019\u00e9tude, la  fabrication, la transformation, l\u2019utilisation et la vente",
   "dimensions": {
    "concept": "ifrs-full:DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities",
    "language": "fr",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact_25035": {
   "value": "922800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:RevenueFromContractsWithCustomers",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25036": {
   "value": "633000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CostOfSales",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25037": {
   "value": "289800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:GrossProfit",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25038": {
   "value": "75800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:SellingExpense",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25039": {
   "value": "118600000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:AdministrativeAndResearchExpense",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25040": {
   "value": "1400000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:AmortizationOfRevaluedIntangibleAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25008": {
   "value": "847200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:RevenueFromContractsWithCustomers",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25009": {
   "value": "595600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CostOfSales",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25010": {
   "value": "251600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:GrossProfit",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25011": {
   "value": "71400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:SellingExpense",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25012": {
   "value": "107900000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:AdministrativeAndResearchExpense",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25013": {
   "value": "1400000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:AmortizationOfRevaluedIntangibleAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25047": {
   "value": "1400000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:OtherOperatingExpensesFromOrdinaryActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25020": {
   "value": "2300000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:OtherOperatingExpensesFromOrdinaryActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25048": {
   "value": "92600000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:ProfitLossFromOrdinaryOperatingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25021": {
   "value": "68600000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:ProfitLossFromOrdinaryOperatingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25049": {
   "value": "7900000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:OtherOperatingExpensesFromNonOrdinaryActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25022": {
   "value": "51400000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:OtherOperatingExpensesFromNonOrdinaryActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25014": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:OtherOperatingIncomeFromNonOrdinaryActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25041": {
   "value": "3000000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:OtherOperatingIncomeFromNonOrdinaryActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25042": {
   "value": "87700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25015": {
   "value": "17200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25043": {
   "value": "10700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:FinanceCosts",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25053": {
   "value": "-10700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25054": {
   "value": "77000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25016": {
   "value": "12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:FinanceCosts",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25026": {
   "value": "-12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25027": {
   "value": "5200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25055": {
   "value": "18600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25044": {
   "value": "58400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25028": {
   "value": "14000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25017": {
   "value": "-8800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25045": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromDiscontinuedOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25018": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromDiscontinuedOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25046": {
   "value": "58400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25019": {
   "value": "-8800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25059": {
   "value": "54400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25060": {
   "value": "4000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25032": {
   "value": "-12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25033": {
   "value": "3200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25061": {
   "value": "58400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25034": {
   "value": "-8800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25050": {
   "value": "2.62",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShare",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25051": {
   "value": "2.58",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShare",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25023": {
   "value": "-0.58",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShare",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25024": {
   "value": "-0.57",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShare",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25052": {
   "value": "2.62",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShareFromContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25056": {
   "value": "2.58",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShareFromContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25025": {
   "value": "-0.58",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShareFromContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25029": {
   "value": "-0.57",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShareFromContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25057": {
   "value": "0",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShareFromDiscontinuedOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25058": {
   "value": "0",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShareFromDiscontinuedOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25030": {
   "value": "0",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShareFromDiscontinuedOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25031": {
   "value": "0",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShareFromDiscontinuedOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "fact_25076": {
   "value": "58400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25062": {
   "value": "-8800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25077": {
   "value": "300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25078": {
   "value": "18100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25079": {
   "value": "3800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25080": {
   "value": "14500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25063": {
   "value": "-600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25064": {
   "value": "-700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25065": {
   "value": "-300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25066": {
   "value": "-1000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25081": {
   "value": "-1100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxCashFlowHedges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25086": {
   "value": "35200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationBeforeTax",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25087": {
   "value": "-500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25067": {
   "value": "1400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxCashFlowHedges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25072": {
   "value": "-27500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationBeforeTax",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25073": {
   "value": "400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25088": {
   "value": "34500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25089": {
   "value": "49000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25082": {
   "value": "107400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25074": {
   "value": "-26500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25075": {
   "value": "-27500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25068": {
   "value": "-36300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25083": {
   "value": "101000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25084": {
   "value": "6400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25069": {
   "value": "-39000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25070": {
   "value": "2700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25085": {
   "value": "107400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25071": {
   "value": "-36300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25114": {
   "value": "269500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Goodwill",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25115": {
   "value": "38800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IntangibleAssetsOtherThanGoodwill",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25090": {
   "value": "256800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Goodwill",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25091": {
   "value": "34600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IntangibleAssetsOtherThanGoodwill",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25116": {
   "value": "33200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Land",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25117": {
   "value": "83800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Buildings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25092": {
   "value": "32100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Land",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25093": {
   "value": "75900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Buildings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25118": {
   "value": "208200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherPropertyPlantAndEquipment",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25119": {
   "value": "79200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ConstructionInProgress",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25094": {
   "value": "186700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherPropertyPlantAndEquipment",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25095": {
   "value": "42700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ConstructionInProgress",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25122": {
   "value": "51600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:RightofuseAssetsThatDoNotMeetDefinitionOfInvestmentProperty",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25096": {
   "value": "46200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:RightofuseAssetsThatDoNotMeetDefinitionOfInvestmentProperty",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25123": {
   "value": "2000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentInvestmentsInEquityInstrumentsDesignatedAtFairValueThroughOtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25124": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentDerivativeFinancialAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25125": {
   "value": "4000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentFinancialAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25097": {
   "value": "3500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentInvestmentsInEquityInstrumentsDesignatedAtFairValueThroughOtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25098": {
   "value": "3700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentFinancialAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25126": {
   "value": "27900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DeferredTaxAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25120": {
   "value": "9500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxAssetsNoncurrent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25099": {
   "value": "25000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DeferredTaxAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25100": {
   "value": "9100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxAssetsNoncurrent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25128": {
   "value": "807700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25101": {
   "value": "716300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25129": {
   "value": "218200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Inventories",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25130": {
   "value": "143600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentReceivables",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25131": {
   "value": "6200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentContractAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25102": {
   "value": "181100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Inventories",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25103": {
   "value": "128200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentReceivables",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25104": {
   "value": "6900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentContractAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25132": {
   "value": "27400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentReceivables",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25121": {
   "value": "2700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxAssetsCurrent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25105": {
   "value": "20600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentReceivables",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25106": {
   "value": "2500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxAssetsCurrent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25134": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25107": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25135": {
   "value": "34000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentFinancialAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25136": {
   "value": "2300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentDerivativeFinancialAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25108": {
   "value": "26000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentFinancialAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25109": {
   "value": "3400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentDerivativeFinancialAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25137": {
   "value": "49500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25138": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25110": {
   "value": "110700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25111": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25127": {
   "value": "483900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25133": {
   "value": "1291700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Assets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25112": {
   "value": "479400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25113": {
   "value": "1195700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Assets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25167": {
   "value": "41600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IssuedCapital",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25168": {
   "value": "503400000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserve",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25169": {
   "value": "54400000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:RetainedEarningsProfitLossForReportingPeriod",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25139": {
   "value": "41700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IssuedCapital",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25140": {
   "value": "509500000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserve",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25141": {
   "value": "-12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:RetainedEarningsProfitLossForReportingPeriod",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25142": {
   "value": "-30000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ReserveOfExchangeDifferencesOnTranslation",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25143": {
   "value": "509200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:EquityAttributableToOwnersOfParent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25144": {
   "value": "24500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncontrollingInterests",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25170": {
   "value": "2800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ReserveOfExchangeDifferencesOnTranslation",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25171": {
   "value": "602300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:EquityAttributableToOwnersOfParent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25172": {
   "value": "29100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncontrollingInterests",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25181": {
   "value": "631300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25153": {
   "value": "533700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25182": {
   "value": "12600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherLongtermProvisions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25173": {
   "value": "49100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentProvisionsForEmployeeBenefits",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25174": {
   "value": "37200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DeferredTaxLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25175": {
   "value": "244500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:LongtermBorrowings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25176": {
   "value": "40000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLeaseLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25187": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentDerivativeFinancialLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25154": {
   "value": "9300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherLongtermProvisions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25145": {
   "value": "71700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentProvisionsForEmployeeBenefits",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25146": {
   "value": "24700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DeferredTaxLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25147": {
   "value": "230900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:LongtermBorrowings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25148": {
   "value": "32700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLeaseLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25159": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentDerivativeFinancialLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25188": {
   "value": "383400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25160": {
   "value": "369300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25177": {
   "value": "67100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentPayables",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25178": {
   "value": "28500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentContractLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25179": {
   "value": "112800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentNonfinancialLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25180": {
   "value": "10400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentProvisions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25193": {
   "value": "12600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentLeaseLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25194": {
   "value": "4600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxLiabilitiesCurrent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25149": {
   "value": "56100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentPayables",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25150": {
   "value": "23600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentContractLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25151": {
   "value": "87500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentNonfinancialLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25152": {
   "value": "17500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentProvisions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25165": {
   "value": "13900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentLeaseLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25166": {
   "value": "4300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxLiabilitiesCurrent",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25183": {
   "value": "7300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentPayablesForPurchaseOfNoncurrentAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25155": {
   "value": "2200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentPayablesForPurchaseOfNoncurrentAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25184": {
   "value": "7000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentFinancialLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25156": {
   "value": "74200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentFinancialLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25157": {
   "value": "900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentDerivativeFinancialLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25185": {
   "value": "1300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentDerivativeFinancialLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25186": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:FinancialCurrentAccounts",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25158": {
   "value": "200000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:FinancialCurrentAccounts",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25189": {
   "value": "25100000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:BankOverdraftsClassifiedAsFinancialLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25190": {
   "value": "200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25161": {
   "value": "11600000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:BankOverdraftsClassifiedAsFinancialLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25162": {
   "value": "700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25191": {
   "value": "276900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25192": {
   "value": "1291700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:EquityAndLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25163": {
   "value": "292700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CurrentLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25164": {
   "value": "1195700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:EquityAndLiabilities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25258": {
   "value": "41700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25304": {
   "value": "452600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25315": {
   "value": "57300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25307": {
   "value": "-57300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25308": {
   "value": "-12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25280": {
   "value": "-3000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25250": {
   "value": "548600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25224": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25271": {
   "value": "22000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25196": {
   "value": "570600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25195": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25283": {
   "value": "57300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25225": {
   "value": "-12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25261": {
   "value": "3200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25197": {
   "value": "-8800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25284": {
   "value": "1000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25233": {
   "value": "1000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25198": {
   "value": "1000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25285": {
   "value": "-600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25234": {
   "value": "-600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25207": {
   "value": "-600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25286": {
   "value": "-400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25226": {
   "value": "-400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25227": {
   "value": "-27000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25228": {
   "value": "-27000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25229": {
   "value": "-39000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25235": {
   "value": "-0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaid",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25208": {
   "value": "-400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25199": {
   "value": "-27500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25200": {
   "value": "-27500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25201": {
   "value": "-36300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25202": {
   "value": "200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaid",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25203": {
   "value": "-2700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTreasuryShareTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25204": {
   "value": "100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IssueOfEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25274": {
   "value": "-27000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25275": {
   "value": "-27000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25276": {
   "value": "-27000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25264": {
   "value": "-500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25265": {
   "value": "-500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25262": {
   "value": "2700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25253": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25254": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25287": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25291": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25309": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25310": {
   "value": "-12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25263": {
   "value": "200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaid",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25292": {
   "value": "-2700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTreasuryShareTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25288": {
   "value": "100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IssueOfEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25236": {
   "value": "-2700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTreasuryShareTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25230": {
   "value": "100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IssueOfEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25289": {
   "value": "2100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25231": {
   "value": "2100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25205": {
   "value": "2100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25290": {
   "value": "100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25232": {
   "value": "100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25206": {
   "value": "100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25259": {
   "value": "41700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25305": {
   "value": "509500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25293": {
   "value": "-12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25316": {
   "value": "-12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25311": {
   "value": "12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25281": {
   "value": "-30000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25251": {
   "value": "509200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25237": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25272": {
   "value": "24500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25209": {
   "value": "533700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25211": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25312": {
   "value": "54400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25238": {
   "value": "54400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25266": {
   "value": "4000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25212": {
   "value": "58400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25294": {
   "value": "-700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25295": {
   "value": "300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25239": {
   "value": "-700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25246": {
   "value": "300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25213": {
   "value": "-700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25222": {
   "value": "300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25300": {
   "value": "14300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25247": {
   "value": "14300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25240": {
   "value": "32800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25241": {
   "value": "46600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25242": {
   "value": "101000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25243": {
   "value": "13500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaid",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25248": {
   "value": "1900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTreasuryShareTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25223": {
   "value": "14300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25214": {
   "value": "35200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25215": {
   "value": "49000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25216": {
   "value": "107400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25217": {
   "value": "15300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaid",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25218": {
   "value": "1900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTreasuryShareTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25278": {
   "value": "32800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25279": {
   "value": "32800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25277": {
   "value": "32800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25267": {
   "value": "2400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25269": {
   "value": "2400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25255": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25256": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25301": {
   "value": "13800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25296": {
   "value": "13800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25297": {
   "value": "13500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaid",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25298": {
   "value": "1900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTreasuryShareTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25313": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25314": {
   "value": "54400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25270": {
   "value": "6400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25268": {
   "value": "1800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaid",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25257": {
   "value": "100000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:IssueReductionOfEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25299": {
   "value": "300000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:IssueReductionOfEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25302": {
   "value": "2000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25249": {
   "value": "300000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:IssueReductionOfEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25244": {
   "value": "2000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25219": {
   "value": "300000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:IssueReductionOfEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25220": {
   "value": "2000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25303": {
   "value": "1900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25245": {
   "value": "1900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25221": {
   "value": "1900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25260": {
   "value": "41600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25306": {
   "value": "503400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsExcludingProfitLossForReportingperiodAndOtherReserveMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25317": {
   "value": "54400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "mersen:RetainedEarningsProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25282": {
   "value": "2800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25252": {
   "value": "602300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25273": {
   "value": "29100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25210": {
   "value": "631300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25353": {
   "value": "77000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25354": {
   "value": "54700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25355": {
   "value": "-5400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForProvisions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25356": {
   "value": "10700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForFinanceCosts",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25357": {
   "value": "500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25319": {
   "value": "5200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25320": {
   "value": "52900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25321": {
   "value": "32000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForProvisions",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25322": {
   "value": "12000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForFinanceCosts",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25323": {
   "value": "200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25358": {
   "value": "1000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherAdjustmentsForNoncashItems",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25324": {
   "value": "10400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherAdjustmentsForNoncashItems",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25327": {
   "value": "112700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25361": {
   "value": "138400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25362": {
   "value": "5900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInWorkingCapital",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25363": {
   "value": "15700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25364": {
   "value": "116800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivitiesContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25365": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25328": {
   "value": "-31400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInWorkingCapital",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25329": {
   "value": "11400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25330": {
   "value": "132700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivitiesContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25331": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25359": {
   "value": "116800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25325": {
   "value": "132700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25367": {
   "value": "5500000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:PurchaseOfIntangibleAssetsAdjustedForIncreaseDecreaseInLiabilitiestoSuppliersOfAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25368": {
   "value": "87200000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:PurchaseOfPropertyPlantAndEquipmentAdjustedForIncreaseDecreaseInLiabilitiesToSuppliersOfFixedAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25369": {
   "value": "8500000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:IncreaseDecreaseInLiabilitiestoSuppliersOfAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25333": {
   "value": "5200000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:PurchaseOfIntangibleAssetsAdjustedForIncreaseDecreaseInLiabilitiestoSuppliersOfAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25334": {
   "value": "58400000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:PurchaseOfPropertyPlantAndEquipmentAdjustedForIncreaseDecreaseInLiabilitiesToSuppliersOfFixedAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25335": {
   "value": "1700000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:IncreaseDecreaseInLiabilitiestoSuppliersOfAssets",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25370": {
   "value": "-0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25336": {
   "value": "-0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25371": {
   "value": "9400000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:CashFlowsFromUsedInObtainingLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25360": {
   "value": "-300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25373": {
   "value": "-93900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivitiesContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25374": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25337": {
   "value": "13600000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:CashFlowsFromUsedInObtainingLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25326": {
   "value": "1100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25339": {
   "value": "-74400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivitiesContinuingOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25340": {
   "value": "0",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25375": {
   "value": "-93900000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25376": {
   "value": "22900000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:CashFlowsFromUsedInOperatingAndInvestingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25341": {
   "value": "-74400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25342": {
   "value": "58300000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:CashFlowsFromUsedInOperatingAndInvestingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25343": {
   "value": "-3500000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:CapitalincreaseDecreaseReceivedPaidAndOtherChangesInEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25332": {
   "value": "100000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaidClassifiedAsFinancingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25345": {
   "value": "7400000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:InterestPaidClassifiedAsFinancingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25346": {
   "value": "13500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25347": {
   "value": "29200000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:CashInflowsOutflowsRelatedToBorrowingsExcludingLeases",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25348": {
   "value": "4700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25377": {
   "value": "1600000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:CapitalincreaseDecreaseReceivedPaidAndOtherChangesInEquity",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25366": {
   "value": "15300000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaidClassifiedAsFinancingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25379": {
   "value": "6800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:InterestPaidClassifiedAsFinancingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25380": {
   "value": "13600000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25381": {
   "value": "-50800000",
   "decimals": -5,
   "dimensions": {
    "concept": "mersen:CashInflowsOutflowsRelatedToBorrowingsExcludingLeases",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25382": {
   "value": "-85000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivities",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25383": {
   "value": "-62000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25350": {
   "value": "110700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25352": {
   "value": "49500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25349": {
   "value": "63000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25318": {
   "value": "45200000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25351": {
   "value": "110700000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25338": {
   "value": "-2500000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25344": {
   "value": "63000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25372": {
   "value": "-800000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "fact_25378": {
   "value": "-62000000",
   "decimals": -5,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges",
    "entity": "scheme:OQXDLNM5DTBULYMF5U27",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  }
 }
}