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Financial instruments and financial risk management - Fair value transfers (Details) - EUR (€)
€ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Financial instruments      
Transfer from level 1 to level 2 (assets) € 0 € 0 € 0
Transfer from level 2 to level 1 (assets) 0 0 0
Transfer from level 1 to level 2 (liabilities) 0 0 0
Transfer from level 2 to level 1 (liabilities) 0 0 0
Transfer into Level 3 (assets) 0 0 0
Transfer out of Level3 (assets) 0 0 0
Transfer into Level 3 (liabilities) 0 0 0
Transfer out of Level3 (liabilities) € 0 € 0 € 0