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Shareholder' equity - Schedule of Changes in Share Capital, Share Premium and Number of Ordinary Shares and Special Voting Shares (Details) € / shares in Units, € in Thousands, $ in Thousands |  | 7 Months Ended | 12 Months Ended
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Jul. 29, 2025 EUR (€) € / shares shares | Jul. 29, 2025 EUR (€) € / shares shares | Dec. 31, 2025 EUR (€) shares | Dec. 31, 2024 EUR (€) shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 EUR (€) shares | Dec. 31, 2023 USD ($) shares
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Share issue related cost | € | € 1,200 |  |  |  |  |  |
Treasury price, per share | € / shares | € 8.95 | € 8.95 |  |  |  |  |
Sale of treasury shares, net | € |  |  | € 107,216 |  |  | € 3,654 |
Percentage of ordinary shares outstanding | 10.00% |  |  |  |  |  |
Total equity attributable to shareholders of the Parent Company |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Sale of treasury shares, net | € |  |  | € 107,216 |  |  | € 3,654 |
Equity settled share based payments |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Other long-term employee benefits | $ |  |  |  |  | $ 7,500 |  | $ 7,500
CEO 2022-2024 LTIP |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Number of shares issued, beginning of period (in shares) |  | 588,000 | 588,000 |  |  |  |
Number of shares issued, end of period (in shares) |  |  | 368,943 | 588,000 | 588,000 |  |
CEO IPO Performance Share Units Plan |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Number of shares issued, beginning of period (in shares) |  | 360,000 | 360,000 |  |  |  |
Number of shares issued, end of period (in shares) |  |  |  | 360,000 | 360,000 |  |
Zegna directors |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Number of shares issued, beginning of period (in shares) |  | 430,000 | 430,000 |  |  |  |
Number of shares issued, end of period (in shares) |  |  |  | 430,000 | 430,000 |  |
Senior Management Team |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Number of shares issued, beginning of period (in shares) |  | 609,756 | 609,756 |  |  |  |
Number of shares issued, end of period (in shares) |  |  |  | 609,756 | 609,756 |  |
Zegna non-executive directors |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Number of shares issued, beginning of period (in shares) |  | 78,460 | 78,460 |  |  |  |
Number of shares issued, end of period (in shares) |  |  | 76,400 | 78,460 | 78,460 |  |
Senior Management Team (excluding the CEO) |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Number of shares issued, beginning of period (in shares) |  | 127,000 | 127,000 | 30,000 | 30,000 |  |
Number of shares issued, end of period (in shares) |  |  | 1,140,546 | 127,000 | 127,000 | 30,000 | 30,000
Share Capital |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
At beginning of period | € |  | € 9,154 | € 9,154 | € 9,154 |  |  |
At end of period | € |  |  | 9,154 | 9,154 |  | € 9,154 |
Share premium |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
At beginning of period | € |  | € 782,587 | 782,587 | 782,587 |  |  |
At end of period | € |  |  | € 782,587 | € 782,587 |  | € 782,587 |
Outstanding ordinary shares |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Number of shares issued, beginning of period (in shares) |  | 252,503,479 | 252,503,479 | 250,310,263 | 250,310,263 |  |
Ordinary shares assigned under share-based payments (in shares) |  |  | 1,615,889 | 2,193,216 | 2,193,216 |  |
Sale Of treasury shares |  |  | 14,121,062 |  |  |  |
Number of shares issued, end of period (in shares) |  |  | 268,240,430 | 252,503,479 | 252,503,479 | 250,310,263 | 250,310,263
Shares issued of transaction cost | 26,800,000 | 26,800,000 |  |  |  |  |
Number of shares outstanding (in shares) | 12,700,000 | 12,700,000 |  |  |  |  |
Ordinary shares held in treasury |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Number of shares issued, beginning of period (in shares) |  | 50,201,247 | 50,201,247 | 52,394,463 | 52,394,463 |  |
Ordinary shares assigned under share-based payments (in shares) |  |  | (1,615,889) | (2,193,216) | (2,193,216) |  |
Sale Of treasury shares |  |  | (14,121,062) |  |  |  |
Number of shares issued, end of period (in shares) |  |  | 34,464,296 | 50,201,247 | 50,201,247 | 52,394,463 | 52,394,463
Total ordinary shares |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Number of shares issued, beginning of period (in shares) |  | 302,704,726 | 302,704,726 | 302,704,726 | 302,704,726 |  |
Number of shares issued, end of period (in shares) |  |  | 302,704,726 | 302,704,726 | 302,704,726 | 302,704,726 | 302,704,726
Special voting shares |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |
Number of shares issued, beginning of period (in shares) |  | 154,981,350 | 154,981,350 | 154,981,350 | 154,981,350 |  |
Ordinary shares assigned under share-based payments (in shares) |  |  | 0 |  |  |  |
Sale Of treasury shares |  |  | 0 |  |  |  |
Number of shares issued, end of period (in shares) |  |  | 154,981,350 | 154,981,350 | 154,981,350 | 154,981,350 | 154,981,350

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