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Financial risk management - Disclosure of Sensitivity analysis of reasonably possible change in interest rate (Detail) € in Thousands | 12 Months Ended
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Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€)
Sensitivity Analysis Of Reasonably Possible Change In Interest Rate [Line Items] |  |
Increase In Basis Points | 0.0100 | 0.0100
Decrease In Basis Points | (0.0100) | (0.0100)
Increase In Loss Before Tax | € 253 | € 328
Decrease In Loss Before Tax | € (253) | € (328)

X
- Definition Decrease in basis points. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition (decrease)in loss before tax. + References No definition available. + Details
Name: | lanv_DecreaseInLossBeforeTax
Namespace Prefix: | lanv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase in basis points. + References No definition available. + Details
Name: | lanv_IncreaseInBasisPoints
Namespace Prefix: | lanv_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase in loss before tax. + References No definition available. + Details
Name: | lanv_IncreaseInLossBeforeTax
Namespace Prefix: | lanv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sensitivity analysis of reasonably possible change in interest rate. + References No definition available. + Details
Name: | lanv_SensitivityAnalysisOfReasonablyPossibleChangeInInterestRateLineItems
Namespace Prefix: | lanv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration