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Qualitative and quantitative information on financial risks - Summary of Aging of Trade Receivables (Detail) - EUR (€) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | € 570,191,000 | € 588,386,000 |
Loss allowance | (23,052,000) | (14,590,000) | € (6,681,000)
Trade receivables |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 227,087,000 | 248,790,000 |
Credit risk | Trade receivables |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 227,087,000 | 248,790,000 |
Loss allowance | (23,052,000) | (14,590,000) |
Credit risk | Trade receivables | Gross carrying amount |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 250,139,000 | 263,380,000 |
Credit risk | Trade receivables | Not yet due |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 182,918,000 | 180,207,000 |
Loss allowance | (3,777,000) | 31,000 |
Credit risk | Trade receivables | Not yet due | Gross carrying amount |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 186,695,000 | 180,176,000 |
Credit risk | Trade receivables | 0-120 days overdue |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 27,422,000 | 58,780,000 |
Loss allowance | (8,827,000) | (1,503,000) |
Credit risk | Trade receivables | 0-120 days overdue | Gross carrying amount |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 36,249,000 | 60,283,000 |
Credit risk | Trade receivables | 121-180 days overdue |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 7,616,000 | 5,460,000 |
Loss allowance | (2,050,000) | (771,000) |
Credit risk | Trade receivables | 121-180 days overdue | Gross carrying amount |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 9,666,000 | 6,231,000 |
Credit risk | Trade receivables | >180 days overdue |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 9,131,000 | 4,343,000 |
Loss allowance | (8,398,000) | (12,347,000) |
Credit risk | Trade receivables | >180 days overdue | Gross carrying amount |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Trade receivables | 17,529,000 | 16,690,000 |
Foreign currency risk |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Receivables and payables | 261,905,000 | 377,297,000 |
Foreign currency risk | Thom Browne |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Receivables and payables | (90,295,000) | (127,072,000) |
Impact on increase in profit before tax | 4,300,000 | 0.6051 |
Impact on decrease in profit before tax | (4,752,000) | (0.6688) |
Foreign currency risk | Thom Browne segment |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Receivables and payables | (90,295,000) | (127,072,000) |
Impact on increase in profit before tax | 3,471,000 | 6,043,000 |
Impact on decrease in profit before tax | (3,654,000) | (6,419,000) |
Foreign currency risk | Dondi |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Receivables and payables | (15,337,000) | (19,266,000) |
Impact on increase in profit before tax | 860,000 | 1,261,000 |
Impact on decrease in profit before tax | (930,000) | (1,375,000) |
Foreign currency risk | Thom Browne And Dondi |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Receivables and payables | (105,632,000) | (146,338,000) |
Impact on increase in profit before tax | 4,331,000 | 7,304,000 |
Impact on decrease in profit before tax | (4,584,000) | (7,794,000) |
Foreign currency risk | Trade receivables |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Receivables and payables | 178,282,000 | 326,611,000 |
Impact on increase in profit before tax | (0.8489) | (1.5552) |
Impact on decrease in profit before tax | 0.9383 | 1.7190 |
Foreign currency risk | Trade receivables | Swiss Franc |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Receivables and payables | (16,975,000) | (15,994,000) |
Impact on increase in profit before tax | 0.0808 | 0.0762 |
Impact on decrease in profit before tax | € (0.0893) | € (0.0842) |

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