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Business combinations - Additional Information (Details) € in Thousands, $ in Thousands |  |  |  |  | 6 Months Ended | 8 Months Ended | 12 Months Ended |  |  |  |  |
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Jan. 01, 2024 EUR (€) | Jul. 01, 2023 EUR (€) store | Apr. 28, 2023 EUR (€) | Apr. 28, 2023 USD ($) | Apr. 27, 2023 | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2025 EUR (€) store | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Jul. 31, 2025 EUR (€) | Jan. 31, 2025 EUR (€) | Jul. 31, 2024 EUR (€) | Jan. 31, 2024 EUR (€) | Apr. 28, 2023 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs related to the business combination |  |  |  |  |  |  |  |  |  | € 2,140 |  |  |  |  |
Tom Ford International LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |
Provision of guarantees or collateral to entity, related party transactions | $ |  |  |  | $ 6,875 |  |  |  |  |  |  |  |  |  |  |
Pelletteria Tizeta S.r.l. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Pelletteria Tizeta S.r.l. | Tom Ford International LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
TFI Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail stores | store |  |  |  |  |  |  |  | 66 |  |  |  |  |  |  |
Pelletteria Tizeta S.r.l. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group’s percentage interest |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |
CGU Ermenegildo Zegna Korea Co.Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group’s percentage interest | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | € 8,280 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs related to the business combination |  |  |  |  |  |  |  |  | € 33 |  |  |  |  |  |
Revenue of the acquiree since the acquisition date | 15,649 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Profit (loss) of the acquiree since the acquisition date | (24) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables | 1,576 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Best estimate at acquisition date of contractual cash flows not to be collected | 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of pre-existing intercompany balances | € 2,540 |  |  |  |  |  |  |  |  |  |  |  |  |  |
CGU Thom Browne Korea Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | € 23,966 |  |  |  |  |  |  |  |  |  |  |  |  |
Costs related to the business combination |  | € 263 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue of the acquiree since the acquisition date |  |  |  |  |  | € 19,668 |  |  |  |  |  |  |  |  |
Profit (loss) of the acquiree since the acquisition date |  |  |  |  |  | € (1,003) |  |  |  |  |  |  |  |  |
Number of retail stores | store |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of pre-existing intercompany balances |  | € 18,583 |  |  |  |  |  |  | 9,066 |  | € 4,413 | € 4,673 | € 4,699 | € 4,881 |
Tom Ford International LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs related to the business combination |  |  | € 5,436 |  |  |  |  |  |  |  |  |  |  |  |
Revenue of the acquiree since the acquisition date |  |  |  |  |  |  | € 235,531 |  |  |  |  |  |  |  |
Profit (loss) of the acquiree since the acquisition date |  |  |  |  |  |  | € 14,926 |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  |  |  |  | € 24,571 |  |  |  |  |  |  |
Best estimate at acquisition date of contractual cash flows not to be collected |  |  |  |  |  |  |  | € 1,242 |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  | 85.00%
Implied fair value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000
Additional revenues if acquisition had occurred at beginning of year |  |  |  |  |  |  |  |  | 97,000 |  |  |  |  |  |
Additional net income if acquisition had occurred at beginning of year |  |  |  |  |  |  |  |  | € 17,000 |  |  |  |  |  |
Percentage of entity's assets |  |  |  |  |  |  |  | 15.70% |  |  |  |  |  |  |
Percentage of entity's revenue |  |  |  |  |  |  |  | 12.40% |  |  |  |  |  |  |
Long-term licensing and collaboration agreement, renewal term |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  | 10 years
Long-term licensing and collaboration agreement, term of minimum annual guaranteed royalties |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Tom Ford International LLC | Concessions, licenses, trademarks and patents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets recognised as of acquisition date |  |  | € 99,295 |  |  |  |  |  |  |  |  |  |  |  |
Useful life of intangible asset |  |  | 30 years | 30 years |  |  |  |  |  |  |  |  |  |  |
Right-of-use guaranteed years |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  | 20 years
Right-of-use automatic renewal term |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  | 10 years
Zegna Doha Trading WLL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  |  |  |  | € 1,100 |  |  |  |  |  |  |
Zegna Doha Trading WLL | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group’s percentage interest | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Zegna Doha Trading WLL | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Group’s percentage interest | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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