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Issued share capital, share premium account and share options - Share price (Details)
Options in Millions
12 Months Ended
Mar. 31, 2022
Options
€ / shares
Mar. 31, 2021
Options
€ / shares
Mar. 31, 2020
Options
€ / shares
Disclosure of classes of share capital [line items]      
Closing share price € 13.59 € 16.55 € 9.33
Number of options exercisable | Options 4.3 10.9 0.0
Average share price € 16.08 € 13.01 € 11.77
Number of options exercised | Options 6.5 3.6 3.0
Minimum      
Disclosure of classes of share capital [line items]      
Share price during period € 11.83 € 8.20 € 8.32
Maximum      
Disclosure of classes of share capital [line items]      
Share price during period € 18.45 € 17.56 € 16.07