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Share-based payments - Additional Information (Details) $ / shares in Units, € in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
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Mar. 26, 2025 shares | Apr. 05, 2023 shares | Jun. 30, 2025 shares | Apr. 30, 2025 shares | Jul. 31, 2024 shares | Oct. 31, 2023 shares tranche | Jun. 30, 2023 EUR (€) shares | Jun. 30, 2022 EUR (€) shares | Dec. 31, 2021 shares | Dec. 31, 2025 EUR (€) shares tranche | Dec. 31, 2024 USD ($) shares tranche | Dec. 31, 2024 EUR (€) shares tranche | Dec. 31, 2023 USD ($) shares tranche $ / shares | Dec. 31, 2023 EUR (€) shares tranche | Dec. 31, 2022 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,520,000
Number of tranches for the right to exercise a sale option | tranche |  |  |  |  |  |  |  |  |  | 3 | 3 | 3 | 3 | 3 |
Non-executive director remuneration, percentage received in cash |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Non-executive director remuneration, percentage received in equity |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% | 50.00% |  |  |
Share-based compensation expense | € |  |  |  |  |  |  |  |  |  | € 4,417 |  | € 8,472 |  | € 19,780 |
Zegna non-executive directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  |  |  |  |  | 94,320 | 71,620,000 | 71,620,000 | 76,400 | 76,400 |
Non-executive director remuneration, percentage received in equity |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
2022 | Share price of at least USD 11.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.50 |  |
Number of trading days determining share price |  |  |  |  |  |  |  |  |  |  |  |  | 20 days | 20 days |
2022 | Share price of at least USD 11.50 | Zegna directors, excluding the CEO, key executives, and other employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.50 |  |
Number of trading days determining share price |  |  |  |  |  |  |  |  | 10 days |  |  |  |  |  |
2022 | Share price of at least USD 12.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.50 |  |
Number of trading days determining share price |  |  |  |  |  |  |  |  |  |  |  |  | 20 days | 20 days |
2022 | Share price of at least USD 12.50 | Zegna directors, excluding the CEO, key executives, and other employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in USD per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.50 |  |
Number of trading days determining share price |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |
Equity settled share based payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term employee benefits | $ |  |  |  |  |  |  |  |  |  |  | $ 7,500 |  | $ 7,500 |  |
Share-based compensation expense | € |  |  |  |  |  |  |  |  |  |  |  | € 6,562 |  |  |
Shares exercised (in shares) |  |  |  |  |  |  | 468,450 | 459,086 |  |  |  |  |  |  |
Options exercised | € |  |  |  |  |  |  | € 3,654 | € 3,390 |  |  |  |  |  |  |
Performance share units | Equity settled share based payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  | 1,290,000 |  |  |  |  |  |  |  | 518,350 | 518,350 |  |  |
Performance share units | Equity settled share based payments | Zegna directors, excluding the CEO, key executives, and other employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  | 450,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Performance share units | Equity settled share based payments | LTI Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) | 1,140,546 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,417,150
Performance share units | Equity settled share based payments | Award with vesting tranches |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000
Performance share units | Equity settled share based payments | Award with vesting tranches | Zegna directors, excluding the CEO, key executives, and other employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |
Performance share units | Equity settled share based payments | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 240,000 | 240,000 |
Performance share units | Equity settled share based payments | 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 360,000 | 360,000 |
Performance share units | Equity settled share based payments | 2023 | Zegna directors, excluding the CEO, key executives, and other employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  |  |  |  | 450,000 |  |  |  |  |  |
Restricted share units | Equity settled share based payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  | 17,000 | 170,000 |  |  |  |  |  |  |  |  |
Restricted share units | Equity settled share based payments | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  | 80,000 |  |  |  |  |  |  |  |  |
Number of equal installments | tranche |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Restricted share units | Equity settled share based payments | 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  | 90,000 |  |  |  |  |  |  |  |  |
Number of equal installments | tranche |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Retention restricted share units | Equity settled share based payments | LTI Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 607,350 | 607,350 |
Other share-based payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | € |  |  |  |  |  |  |  |  |  | € (1,416) |  | € 1,602 |  | € 6,562 |
CEO 2025-2027 PSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  |  |  |  |  |  |  | 744,416 | 0 | 0 | 0 | 0 |
Number of other equity instruments outstanding (in shares) |  |  |  |  |  |  |  |  |  | 744,416 | 0 | 0 | 0 |  | 0
Share-based compensation expense | € |  |  |  |  |  |  |  |  |  | € 766 |  | € 0 |  | € 0 |
CEO 2025-2027 PSUs | Equity settled share based payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments granted in share based payment arrangement (in shares) |  |  |  | 744,416 |  |  |  |  |  |  |  |  |  |  |
Number of other equity instruments outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 368,943 | 368,943 |  |  |

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