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Related party transactions - Schedule of Remuneration Of And Outstanding Balances With Zegna Directors And Key Executives With Strategic Responsibilities (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Remuneration Of And Outstanding Balances With Key Management Personnel [Line Items]      
Short-term employee benefits € 17,871 € 15,849 € 17,516
Post- employment benefits 1,093 1,986 3,047
Other long-term benefits   3,392 9,110
Other long-term benefits (3,175)    
Share-based payments 1,286 4,058 14,251
Professional fees expense 2,609    
Key Management Personnel      
Disclosure Of Remuneration Of And Outstanding Balances With Key Management Personnel [Line Items]      
Employee benefits 3,749 7,074 4,346
Other non current financial liabilities 90,295 127,072 138,558
Other current liabilities € 4,495 € 4,912 € 43,034