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Consolidated shareholders’ equity - Disclosure of Stock Subscription Option Plan Outstanding and Option Exercised (Details)
 12 Months Ended
Apr. 30, 2019
shares
May 02, 2018
shares
May 10, 2017
shares
May 04, 2016
shares
Jun. 24, 2015
shares
Mar. 05, 2014
shares
Mar. 05, 2013
shares
Mar. 05, 2012
shares
Dec. 31, 2022
shares
€ / shares
Stock subscription option plan                  
Disclosure of stock subscription option plan outstanding and option exercised [line items]                  
Number of options outstanding (in shares)                 1,837,969
Stock subscription option plan three                  
Disclosure of stock subscription option plan outstanding and option exercised [line items]                  
Number of options granted (in shares)               814,050  
Exercise price (in euros per share) | € / shares                 € 56.44
Number of options outstanding (in shares)                 0
Stock subscription option plan four                  
Disclosure of stock subscription option plan outstanding and option exercised [line items]                  
Number of options granted (in shares)             788,725    
Exercise price (in euros per share) | € / shares                 € 72.19
Number of options outstanding (in shares)                 78,089
Stock subscription option plan five                  
Disclosure of stock subscription option plan outstanding and option exercised [line items]                  
Number of options granted (in shares)           1,009,250      
Exercise price (in euros per share) | € / shares                 € 73.48
Number of options outstanding (in shares)                 506,042
Stock subscription option plan six                  
Disclosure of stock subscription option plan outstanding and option exercised [line items]                  
Number of options granted (in shares)         435,000        
Exercise price (in euros per share) | € / shares                 € 89.38
Number of options outstanding (in shares)                 338,464
Stock subscription option plan seven                  
Disclosure of stock subscription option plan outstanding and option exercised [line items]                  
Number of options granted (in shares)       402,750          
Exercise price (in euros per share) | € / shares                 € 75.90
Number of options outstanding (in shares)                 264,750
Stock subscription option plan eight                  
Disclosure of stock subscription option plan outstanding and option exercised [line items]                  
Number of options granted (in shares)     378,040            
Exercise price (in euros per share) | € / shares                 € 88.97
Number of options outstanding (in shares)                 268,440
Stock subscription option plan nine                  
Disclosure of stock subscription option plan outstanding and option exercised [line items]                  
Number of options granted (in shares)   220,000              
Exercise price (in euros per share) | € / shares                 € 65.84
Number of options outstanding (in shares)                 168,784
Stock subscription option plan ten                  
Disclosure of stock subscription option plan outstanding and option exercised [line items]                  
Number of options granted (in shares) 220,000                
Exercise price (in euros per share) | € / shares                 € 76.71
Number of options outstanding (in shares)                 213,400