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Related party transactions - Schedule of Transactions with Related Parties (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of transactions between related parties [line items]      
Revenues € 1,916,947 € 1,946,647 € 1,904,549
Cost of sales 622,910 650,087 680,235
Selling, general and administrative expenses 1,033,871 1,008,324 901,364
Marketing expenses 120,686 121,384 114,802
Foreign exchange gains 9,000 (11,338) (5,262)
Zegna Group      
Disclosure of transactions between related parties [line items]      
Revenues 1,916,947 1,946,647 1,904,549
Cost of sales 622,910 650,087 680,235
Selling, general and administrative expenses 1,033,871 1,008,324 901,364
Marketing expenses 120,686 121,384 114,802
Financial income/(expenses) (8,962) (25,967) (30,839)
Foreign exchange gains 9,000 (11,338) (5,262)
Norda Run Inc.      
Disclosure of transactions between related parties [line items]      
Revenues 15,201    
Luigi Fedeli e Figlio S.r.l.      
Disclosure of transactions between related parties [line items]      
Revenues 27,030    
Associates      
Disclosure of transactions between related parties [line items]      
Revenues 15 62 3,324
Cost of sales 4,016 6,467 7,227
Selling, general and administrative expenses 21 65 1,003
Marketing expenses 0 0 0
Financial income/(expenses) 0 (5) 89
Foreign exchange gains (1) 0 (14)
Associates | TFI Group      
Disclosure of transactions between related parties [line items]      
Revenues 0 0 3,233
Cost of sales 0 0 288
Selling, general and administrative expenses 0 0 740
Marketing expenses 0 0 0
Financial income/(expenses) 0 0 (7)
Foreign exchange gains 0 0 0
Royalties   181  
Associates | Filati Biagioli Modesto S.p.A.      
Disclosure of transactions between related parties [line items]      
Revenues 0 0 5
Cost of sales 4,016 5,782 4,782
Selling, general and administrative expenses 20 65 141
Marketing expenses 0 0 0
Financial income/(expenses) 0 0 96
Foreign exchange gains 0 0 0
Associates | Norda Run Inc.      
Disclosure of transactions between related parties [line items]      
Revenues 0 0 0
Cost of sales 0 138 2,072
Selling, general and administrative expenses 1   122
Selling, general and administrative expenses   (4)  
Marketing expenses 0 0 0
Financial income/(expenses) 0 0 0
Foreign exchange gains (1) 0 (14)
Associates | Luigi Fedeli e Figlio S.r.l.      
Disclosure of transactions between related parties [line items]      
Revenues 15 62 86
Cost of sales 0 547 85
Selling, general and administrative expenses 0 4 0
Marketing expenses 0 0 0
Financial income/(expenses) 0 (5) 0
Foreign exchange gains 0 0 0
Companies controlled by Monterubello or its shareholders, the Company’s directors or Senior Management Team | EZ Real Estate      
Disclosure of transactions between related parties [line items]      
Revenues 14 14 4
Cost of sales 2,618 2,534 2,580
Selling, general and administrative expenses 3,871 4,187 4,100
Marketing expenses 2,040 2,106 2,072
Financial income/(expenses) (691) (744) (545)
Foreign exchange gains 0 0 0
Companies controlled by Monterubello or its shareholders, the Company’s directors or Senior Management Team | Schneider Group      
Disclosure of transactions between related parties [line items]      
Revenues 0 6 25
Cost of sales 8,979 13,398 14,209
Selling, general and administrative expenses 73   14
Selling, general and administrative expenses   (1)  
Marketing expenses 0 0 0
Financial income/(expenses) 0 0 0
Foreign exchange gains 15 0 0
Companies controlled by Monterubello or its shareholders, the Company’s directors or Senior Management Team | Alan Real Estate S.A.      
Disclosure of transactions between related parties [line items]      
Revenues 0 0 0
Cost of sales 1,765 1,730 1,650
Selling, general and administrative expenses 3,492 3,160 3,100
Marketing expenses 0 0 0
Financial income/(expenses) (1,627) (1,708) (310)
Foreign exchange gains 11 0 (8)
Companies controlled by Monterubello or its shareholders, the Company’s directors or Senior Management Team | Agnona S.r.l.      
Disclosure of transactions between related parties [line items]      
Revenues 206 70 64
Cost of sales 42 55 35
Selling, general and administrative expenses 275 261 210
Marketing expenses 57 67 32
Financial income/(expenses) 0 (1) (1)
Foreign exchange gains (3) 0 (1)
Companies controlled by Monterubello or its shareholders, the Company’s directors or Senior Management Team | Other companies controlled by Monterubello or its shareholders, Zegna directors or senior management      
Disclosure of transactions between related parties [line items]      
Revenues 150 341 195
Cost of sales 5,127 5,632 5,827
Selling, general and administrative expenses 593 1,311 614
Marketing expenses 14 39 6
Financial income/(expenses) 1 4 3
Foreign exchange gains 3 0 0
UBS Group AG      
Disclosure of transactions between related parties [line items]      
Revenues 0 0 0
Cost of sales 0 0 0
Selling, general and administrative expenses 1,273 559 3,108
Marketing expenses 0 0 0
Financial income/(expenses) 419 (1,519) (1,522)
Foreign exchange gains (971) (1,746) 350
Other      
Disclosure of transactions between related parties [line items]      
Revenues 0 0 0
Cost of sales 0 0 0
Selling, general and administrative expenses 2,628 2,754 3,038
Marketing expenses 0 0 0
Financial income/(expenses) 0 0 0
Foreign exchange gains 0 0 0
Total transactions with related parties      
Disclosure of transactions between related parties [line items]      
Revenues 385 493 3,612
Cost of sales 22,547 29,816 31,528
Selling, general and administrative expenses 12,226 12,296 15,187
Marketing expenses 2,111 2,212 2,110
Financial income/(expenses) (1,898) (3,973) (2,286)
Foreign exchange gains € (946) € (1,746) € 327