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Other non-current financial liabilities - Narrative (Details) € in Thousands	1 Months Ended	6 Months Ended
	Jun. 30, 2021 EUR (€)	Jun. 30, 2026 EUR (€) tranche	Jun. 30, 2025 EUR (€)	Jun. 30, 2024 EUR (€)	Dec. 31, 2025 EUR (€)	Dec. 31, 2021 EUR (€)
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Cash consideration		€ 1,133	€ 0
Written put options on non-controlling interests		109,688			€ 105,632
Thom Browne \| Total for all subsidiaries
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Additional proportion of ownership interest in subsidiary acquired	5.00%
Cash consideration	€ 30,653
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
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Proportion of ownership interests held by non-controlling interests		8.00%
Cash consideration				€ 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		€ 94,172			90,295
Thom Browne \| Written put options
Disclosure Of Other NonCurrent Financial Liabilities [Line Items]
Proportion of ownership interests held by non-controlling interests	10.00%	15.00%
Additional proportion of ownership interest in subsidiary acquired				2.00%
Thom Browne \| 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 \| 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 \| 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		€ 15,516			€ 15,337
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