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Property, plant and equipment - Summary of Impairment (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of impairment loss and reversal of impairment loss [line items]      
Impairment loss € 5,026 € 3,233 € 915
Impairment loss related to right-of-use assets 9,941 7,905 832
Intangible asset impairment 72 58 35
Zegna segment      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Property, plant and equipment, Impairment 1,671 688 595
Reversal of impairment loss related to property, plant and equipment     (44)
Impairment loss     551
Right-of-use assets, Impairment 2,450 3,404 268
Reversal of impairment loss recognized in right of use asset     0
Impairment loss related to right-of-use assets     268
Right-of-use assets, Impairment 8 58 37
Reversal of impairment loss recognised in profit or loss, intangible assets other than goodwill     (2)
Intangible asset impairment     35
Thom Browne segment      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Property, plant and equipment, Impairment 251 752 18
Right-of-use assets, Impairment 244 2,205 0
Right-of-use assets, Impairment 0 0 0
Tom Ford Fashion segment      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Property, plant and equipment, Impairment 3,104 1,793 346
Right-of-use assets, Impairment 7,247 2,296 564
Right-of-use assets, Impairment € 64 € 0 € 0