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Issued share capital, share premium account and share options - Assumptions (Details)
12 Months Ended
Mar. 31, 2020
€ / shares
Mar. 31, 2018
Y
Mar. 31, 2015
€ / shares
Issued share capital, share premium account and share options      
Exercise Price | € / shares € 11.12   € 6.25
Expected term (years) | Y   5