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Issued share capital, share premium account and share options - Share price (Details)
Options in Millions
12 Months Ended
Mar. 31, 2023
Options
€ / shares
Mar. 31, 2022
Options
€ / shares
Mar. 31, 2021
Options
€ / shares
Disclosure of classes of share capital [line items]      
Closing share price € 14.95 € 13.59 € 16.55
Number of options exercisable | Options 1.7 4.3 10.9
Number of options exercised | Options 4.1 6.5 3.6
Minimum      
Disclosure of classes of share capital [line items]      
Share price during period € 10.09 € 11.83 € 8.20
Maximum      
Disclosure of classes of share capital [line items]      
Share price during period 15.76 18.45 17.56
Average      
Disclosure of classes of share capital [line items]      
Share price during period € 13.20 € 16.08 € 13.01