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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
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