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Issued share capital, share premium account and share options - Share price (Details)
12 Months Ended
Mar. 31, 2020
Options
€ / shares
Mar. 31, 2019
Options
€ / shares
Mar. 31, 2018
Options
€ / shares
Disclosure of classes of share capital [line items]      
Share price € 9.33 € 11.67 € 16.00
Average share price € 11.77 € 13.28 € 16.95
Number of options exercisable | Options 0 0  
Number of options exercised | Options 3,000,000 0 0
Minimum      
Disclosure of classes of share capital [line items]      
Share price € 8.32 € 10.04 € 14.55
Maximum      
Disclosure of classes of share capital [line items]      
Share price € 16.07 € 16.72 € 19.39