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Intangible assets - Schedule of Sensitivity Of The Impairment Testing To Reasonably Possible Changes In Both Assumptions (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Tom Ford Fashion Segment |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Headroom | € 53 | € 64
WACC (%) | 9.92% | 9.62%
EBITDA CAGR (%) | 47.30% | 9.00%
Growth rate (%) | 3.00% | 3.00%
WACC +100 bps | 9,000,000 | 14,000,000
EBITDA -500 bps | 12,000,000 | 16,000,000
Growth rate -50 bps | 44,000,000 | 55,000,000
CGU Thom Browne group |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Headroom | € 110 | € 396
WACC (%) | 8.68% | 8.75%
EBITDA CAGR (%) | 50.30% | 31.50%
Growth rate (%) | 2.75% | 2.75%
WACC +100 bps | 0.0054 | 0.0247
EBITDA -500 bps | 0.0055 | 0.0325
Growth rate -50 bps | 0.0060 | 0.0325
CGU Thom Browne Korea Ltd. |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Headroom | € 25 | € 30
WACC (%) | 8.72% | 9.01%
EBITDA CAGR (%) | 42.90% | 28.70%
Growth rate (%) | 3.00% | 3.00%
WACC +100 bps | 0.0021 | 0.0021
EBITDA -500 bps | 0.0020 | 0.0026
Growth rate -50 bps | 0.0022 | 0.0026
CGU Ermenegildo Zegna Korea Co.Ltd. |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Headroom | € 1 | € 5
WACC (%) | 8.72% | 9.01%
EBITDA CAGR (%) | 31.20% | 52.50%
Growth rate (%) | 3.00% | 3.00%
WACC +100 bps | 0 | 0.0003
EBITDA -500 bps | (0.0001) | 0.0003
Growth rate -50 bps | 0 | 0.0004
CGU Gruppo Dondi S.p.A. |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Headroom | € 29 | € 49
WACC (%) | 9.46% | 9.46%
EBITDA CAGR (%) | 7.90% | 17.00%
Growth rate (%) | 3.00% | 3.00%
WACC +100 bps | 0.0025 | 0.0038
EBITDA -500 bps | 0.0025 | 0.0044
Growth rate -50 bps | 0.0025 | 0.0044
CGU Gruppo Dondi S.p.A. |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Headroom | € 14 | € 19
WACC (%) | 9.46% | 9.46%
EBITDA CAGR (%) | 7.00% | 9.10%
Growth rate (%) | 3.00% | 3.00%
WACC +100 bps | 0.0012 | 0.0013
EBITDA -500 bps | 0.0012 | 0.0016
Growth rate -50 bps | 0.0012 | 0.0016
CGU In.Co. S.p.A. |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Headroom | € 40 | € 83
WACC (%) | 9.46% | 9.46%
EBITDA CAGR (%) | 41.10% | 60.80%
Growth rate (%) | 3.00% | 3.00%
WACC +100 bps | 0.0023 | 0.0053
EBITDA -500 bps | 0.0025 | 0.0069
Growth rate -50 bps | 0.0025 | 0.0068
Tessitura Ubertino S.r.l. |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Headroom | € 28 | € 23
WACC (%) | 9.46% | 9.46%
EBITDA CAGR (%) | 10.60% | 4.50%
Growth rate (%) | 3.00% | 3.00%
WACC +100 bps | 0.0025 | 0.0019
EBITDA -500 bps | 0.0026 | 0.0021
Growth rate -50 bps | 0.0026 | 0.0021

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