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Financial risk management - Disclosure of Sensitivity analysis of reasonably possible change in interest rate (Detail) € in Thousands	12 Months Ended
	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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Namespace Prefix:	lanv_
Data Type:	xbrli:decimalItemType
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

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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

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Namespace Prefix:	lanv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration