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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
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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

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