v3.26.1
Shareholders’ equity - Narrative (Details)
€ / shares in Units, € in Thousands
6 Months Ended
Jul. 29, 2026
EUR (€)
Jul. 29, 2025
EUR (€)
Jun. 26, 2025
€ / shares
Jun. 30, 2026
EUR (€)
vote
€ / shares
shares
Jun. 30, 2025
EUR (€)
Dec. 31, 2025
EUR (€)
€ / shares
shares
Dec. 31, 2024
EUR (€)
Dec. 31, 2021
EUR (€)
Disclosure of reserves within equity [line items]                
Total equity (treasury shares)       € 1,110,907 € 952,435 € 1,099,081 € 982,887  
Par value per share (in EUR per share) | € / shares       € 0.02   € 0.02    
Dividends paid per ordinary share (in EUR per share) | € / shares     € 0.12          
Dividends       € 32,267 30,491      
Zegna NonExecutive Directors                
Disclosure of reserves within equity [line items]                
Number of shares issued (in shares) | shares       71,620        
Ordinary shares                
Disclosure of reserves within equity [line items]                
Number of shares issued (in shares) | shares       302,704,726   302,704,726    
Special voting shares                
Disclosure of reserves within equity [line items]                
Number of shares issued (in shares) | shares       154,981,350   154,981,350    
Number of votes per share | vote       1        
Share holding period for conversion       2 years        
Special Voting Shares B                
Disclosure of reserves within equity [line items]                
Number of votes per share | vote       4        
Share holding period for conversion       5 years        
Special Voting Shares C                
Disclosure of reserves within equity [line items]                
Number of votes per share | vote       9        
Share holding period for conversion       10 years        
Reserve for treasury shares                
Disclosure of reserves within equity [line items]                
Number of shares issued (in shares) | shares       33,815,338   34,464,296    
Ordinary shares held in treasury                
Disclosure of reserves within equity [line items]                
Number of shares outstanding (in shares) | shares           34,464,296    
Thom Browne non-controlling interest shareholders | Non-controlling interests options reserve                
Disclosure of reserves within equity [line items]                
Other reserves       € 92,788   € 92,788   € 162,066
Dondi non-controlling interest shareholders | Non-controlling interests options reserve                
Disclosure of reserves within equity [line items]                
Other reserves       21,459   21,459    
Share capital                
Disclosure of reserves within equity [line items]                
Total equity (treasury shares)       9,154 9,154 9,154 9,154  
Reserve for treasury shares                
Disclosure of reserves within equity [line items]                
Total equity (treasury shares)       (281,795) (405,129) (287,203) (418,345)  
Retained earnings                
Disclosure of reserves within equity [line items]                
Total equity (treasury shares)       730,996 683,994 739,625 668,731  
Dividends       32,267 30,491      
Total equity attributable to shareholders of the Parent Company                
Disclosure of reserves within equity [line items]                
Total equity (treasury shares)       1,037,670 885,350 € 1,031,011 € 916,120  
Dividends   € 30,000   € 32,267 € 30,491      
Total equity attributable to shareholders of the Parent Company | Major ordinary share transactions                
Disclosure of reserves within equity [line items]                
Dividends € 32,000