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Business combinations - Schedule of Purchase Consideration, Net Assets Acquired and Goodwill (Details) - EUR (€) € in Thousands | Jul. 31, 2025 | Jan. 31, 2025 | Dec. 31, 2024 | Jul. 31, 2024 | Jan. 31, 2024 | Jan. 01, 2024 | Jul. 01, 2023 | Apr. 28, 2023
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CGU Ermenegildo Zegna Korea Co.Ltd. |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Cash consideration paid |  |  |  |  |  | € 8,970 |  |
Settlement of pre-existing intercompany balances |  |  |  |  |  | 2,540 |  |
Total consideration |  |  |  |  |  | € 11,510 |  |
CGU Thom Browne Korea Ltd. |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Cash consideration paid |  |  |  |  |  |  | € 7,991 |
Settlement of pre-existing intercompany balances | € 4,413 | € 4,673 | € 9,066 | € 4,699 | € 4,881 |  | 18,583 |
Total consideration |  |  |  |  |  |  | € 26,574 |
Tom Ford International LLC |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Cash consideration paid |  |  |  |  |  |  |  | € 91,619
Total consideration |  |  |  |  |  |  |  | € 119,073

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