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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
Dec. 31, 2023
shares
€ / shares
Stock subscription option plan                
Disclosure of stock subscription option plan outstanding and option exercised [line items]                
Number of options outstanding (in shares)               1,333,013
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)               0
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)               91,355
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)               337,714
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)               257,010
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