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Key sources of estimation uncertainty, use of estimates and critical accounting judgments (Details) - tranche
1 Months Ended 12 Months Ended
Apr. 27, 2023
Jun. 30, 2021
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of subsidiaries [line items]          
Number of tranches for the right to exercise a sale option     3 3 3
Luigi Fedeli e Figlio S.r.l.          
Disclosure of subsidiaries [line items]          
Proportion of ownership interest in associate     15.00% 15.00%  
Tom Ford International LLC          
Disclosure of subsidiaries [line items]          
Proportion of ownership interest in associate 15.00%        
Thom Browne segment          
Disclosure of subsidiaries [line items]          
Proportion of ownership interests held by non-controlling interests     8.00%    
Thom Browne segment | Tranche one          
Disclosure of subsidiaries [line items]          
Proportion of ownership interests held by non-controlling interests     5.00%    
Thom Browne segment | Tranche two          
Disclosure of subsidiaries [line items]          
Proportion of ownership interests held by non-controlling interests     3.00%    
Thom Browne segment | Written put options          
Disclosure of subsidiaries [line items]          
Proportion of ownership interests held by non-controlling interests   10.00% 15.00%    
Thom Browne segment | MrThom Browne | Written put options          
Disclosure of subsidiaries [line items]          
Number of tranches for the right to exercise a sale option     2    
Thom Browne segment | MrThom Browne | Written put options | Tranche one          
Disclosure of subsidiaries [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 subsidiaries [line items]          
Proportion of ownership interests held by non-controlling interests     3.00%