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Issued share capital, share premium account and share options (Details) - EUR (€)
€ / shares in Units, € in Millions
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disclosure of classes of share capital [line items]      
Authorized capital € 10.7 € 10.7 € 11.2
Issued capital 6.8 6.7 6.5
Ordinary shares.      
Disclosure of classes of share capital [line items]      
Authorized capital € 9.3 € 9.3 € 9.8
Number of shares authorized 1,550,000,000    
Par value € 0.00600 € 0.00600 € 0.00600
Number of shares issued 1,134,528,528 1,128,062,028 1,089,181,737
Issued capital € 6.8 € 6.7 € 6.5
Class B share      
Disclosure of classes of share capital [line items]      
Authorized capital € 0.7 0.7 0.7
Number of shares authorized 1,368,000,000    
Par value € 0.00050    
Deferred Share      
Disclosure of classes of share capital [line items]      
Authorized capital € 0.7 € 0.7 € 0.7
Number of shares authorized 1,368,000,000    
Par value € 0.00050