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Other current and non-current financial liabilities - Additional Information (Details) € in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2021 EUR (€)	Jun. 30, 2025 EUR (€)	Dec. 31, 2025 EUR (€) tranche	Dec. 31, 2024 EUR (€) tranche	Dec. 31, 2023 EUR (€) tranche	Dec. 31, 2021 EUR (€)
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Number of tranches for the right to exercise a sale option \| tranche			3	3	3
Consideration paid in cash			€ 0	€ 19,307	€ 117,686
Written put options on non-controlling interests			105,632	146,338
Thom Browne non-controlling interest shareholders \| Non-controlling interests options reserve
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Other reserves			€ 92,788	92,788		€ 162,066
Thom Browne segment
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Proportion of ownership interests held by non-controlling interests			8.00%
Consideration paid in cash		€ 22,752
Group’s percentage interest		92.00%
Written put options on non controlling interests, current		€ 22,752
Other changes		€ 3,697
Written put options on non-controlling interests			€ 90,295	127,072
Thom Browne segment \| Tranche one
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Proportion of ownership interests held by non-controlling interests			5.00%
Thom Browne segment \| Tranche two
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Proportion of ownership interests held by non-controlling interests			3.00%
Thom Browne segment \| Thom Browne
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Percentage of additional interest acquired in subsidiary	5.00%
Consideration paid in cash	€ 30,653
Thom Browne segment \| Written put options
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Proportion of ownership interests held by non-controlling interests	10.00%		15.00%
Percentage of additional interest acquired in subsidiary		2.00%
Thom Browne segment \| MrThom Browne \| Written put options
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Number of tranches for the right to exercise a sale option \| tranche			2
Thom Browne segment \| MrThom Browne \| Written put options \| Tranche one
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Proportion of ownership interests held by non-controlling interests			5.00%
Thom Browne segment \| MrThom Browne \| Written put options \| Tranche two
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Proportion of ownership interests held by non-controlling interests			3.00%
Dondi
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Written put options on non-controlling interests			€ 15,337	€ 19,266
Dondi \| Written put options
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Proportion of ownership interests held by non-controlling interests			35.00%
Number of tranches for the right to exercise a sale option \| tranche			2