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Qualitative and quantitative information on financial risks - Summary of Potential Effects on Profit Before Tax of Hypothetical Change in Exchange Rates (Detail) - Foreign currency risk - EUR (€) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Sensitivity threshold, hypothetical change in year-end exchange-rates | 5.00% |
Notional amount | € 261,905,000 | € 377,297,000
Foreign currency hedging instruments |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Impact on increase in profit before tax | 1.2472 | 1.7967
Impact on decrease in profit before tax | (1.3785) | (1.9857)
Trade receivables |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 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
Thom Browne |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | (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)
USD |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 43,124,000 | 139,582,000
USD | Foreign currency hedging instruments |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Impact on increase in profit before tax | 0.2054 | 0.6647
Impact on decrease in profit before tax | (0.2270) | (0.7346)
USD | Trade receivables |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | (14,965,000) | 121,093,000
Impact on increase in profit before tax | 0.0713 | (0.5766)
Impact on decrease in profit before tax | (0.0788) | 0.6373
USD | Thom Browne |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | (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)
CAD |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 8,624,000 | 0
CAD | Foreign currency hedging instruments |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Impact on increase in profit before tax | 0.0411 | 0
Impact on decrease in profit before tax | (0.0454) | 0
CAD | Trade receivables |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 12,614,000 | 0
Impact on increase in profit before tax | (0.0601) | 0
Impact on decrease in profit before tax | 0.0664 | 0
JPY |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 10,332,000 | 20,469,000
JPY | Foreign currency hedging instruments |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Impact on increase in profit before tax | 0.0491 | 0.0975
Impact on decrease in profit before tax | (0.0544) | (0.1077)
JPY | Trade receivables |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 22,279,000 | 16,506,000
Impact on increase in profit before tax | (0.1061) | (0.0786)
Impact on decrease in profit before tax | 0.1172 | 0.0869
CNY |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 172,390,000 | 160,344,000
CNY | Foreign currency hedging instruments |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Impact on increase in profit before tax | 0.8209 | 0.7635
Impact on decrease in profit before tax | (0.9073) | (0.8439)
CNY | Trade receivables |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 77,766,000 | 113,604,000
Impact on increase in profit before tax | (0.3703) | (0.5410)
Impact on decrease in profit before tax | 0.4093 | 0.5979
HKD |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 10,078,000 | 17,697,000
HKD | Foreign currency hedging instruments |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Impact on increase in profit before tax | 0.0480 | 0.0843
Impact on decrease in profit before tax | (0.0530) | (0.0931)
HKD | Trade receivables |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 24,115,000 | 29,115,000
Impact on increase in profit before tax | (0.1148) | (0.1386)
Impact on decrease in profit before tax | 0.1269 | 0.1532
GBP |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 12,512,000 | 27,941,000
GBP | Foreign currency hedging instruments |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Impact on increase in profit before tax | 0.0596 | 0.1331
Impact on decrease in profit before tax | (0.0659) | (0.1471)
GBP | Trade receivables |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 10,802,000 | 7,516,000
Impact on increase in profit before tax | (0.0514) | (0.0358)
Impact on decrease in profit before tax | 0.0569 | 0.0396
SGD |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 4,845,000 | 8,114,000
SGD | Foreign currency hedging instruments |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Impact on increase in profit before tax | 0.0231 | 0.0386
Impact on decrease in profit before tax | (0.0255) | (0.0427)
SGD | Trade receivables |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 16,846,000 | 14,279,000
Impact on increase in profit before tax | (0.0802) | (0.0680)
Impact on decrease in profit before tax | 0.0887 | 0.0752
CHF | Trade receivables |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | (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)
KRW |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 0 | 3,150,000
KRW | Foreign currency hedging instruments |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Impact on increase in profit before tax | 0 | 0.0150
Impact on decrease in profit before tax | 0 | (0.0166)
KRW | Trade receivables |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 45,800,000 | 40,492,000
Impact on increase in profit before tax | (0.2181) | (0.1928)
Impact on decrease in profit before tax | 0.2410 | 0.2131
Hedges of net investment in foreign operations |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 114,148,000 | 277,365,000
Impact on increase in profit before tax | 0.5436 | 1.3208
Impact on decrease in profit before tax | (0.5250) | (1.4599)
Hedges of net investment in foreign operations | USD |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | (66,449,000) | 99,801,000
Impact on increase in profit before tax | (0.3164) | 0.4752
Impact on decrease in profit before tax | 0.3497 | (0.5253)
Hedges of net investment in foreign operations | CAD |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 7,195,000 | 0
Impact on increase in profit before tax | 0.0343 | 0
Impact on decrease in profit before tax | 0.0380 | 0
Hedges of net investment in foreign operations | JPY |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 27,275,000 | 16,428,000
Impact on increase in profit before tax | 0.1299 | 0.0782
Impact on decrease in profit before tax | (0.1436) | (0.0865)
Hedges of net investment in foreign operations | CNY |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 88,046,000 | 98,343,000
Impact on increase in profit before tax | 0.4193 | 0.4683
Impact on decrease in profit before tax | (0.4634) | (0.5176)
Hedges of net investment in foreign operations | HKD |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 12,247,000 | 18,493,000
Impact on increase in profit before tax | 0.0583 | 0.0881
Impact on decrease in profit before tax | (0.0645) | (0.0973)
Hedges of net investment in foreign operations | GBP |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 3,513,000 | 10,223,000
Impact on increase in profit before tax | 0.0167 | 0.0487
Impact on decrease in profit before tax | (0.0185) | (0.0538)
Hedges of net investment in foreign operations | SGD |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 17,629,000 | 14,888,000
Impact on increase in profit before tax | 0.0839 | 0.0709
Impact on decrease in profit before tax | (0.0928) | (0.0784)
Hedges of net investment in foreign operations | KRW |  |
Disclosure Of Potential Effects On Profit Before Tax Of Hypothetical Change InExchange Rates [Line Items] |  |
Notional amount | 24,692,000 | 19,189,000
Impact on increase in profit before tax | 0.1176 | 0.0914
Impact on decrease in profit before tax | € (0.1299) | € (0.1010)

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