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Right-of-use assets - Additional Information (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of quantitative information about right-of-use assets [line items]      
Impairment loss € 5,026 € 3,233 € 915
Leased stores | Zegna Segment      
Disclosure of quantitative information about right-of-use assets [line items]      
Impairment loss € 9,941 € 7,905 € 832
Bottom of range      
Disclosure of quantitative information about right-of-use assets [line items]      
Rental contracts term 1 year    
Extension options term 1 year    
Top of range      
Disclosure of quantitative information about right-of-use assets [line items]      
Rental contracts term 15 years    
Extension options term 10 years