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Deferred and current taxation - Effective corporation tax rate (Details)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Reconciles the statutory rate of Irish corporation tax to the Company's effective corporation tax rate      
Statutory rate of Irish corporation tax on (loss)/profit (12.50%) 12.50% 12.50%
Non-Irish profits and losses taxed at other rates (0.70%) (9.30%) (5.80%)
Other movements 4.80%    
Total effective rate of taxation on (loss)/profits (8.40%) 3.20% 6.70%
Foreign tax rate 25.00% 25.00% 25.00%