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Deferred and current taxation - Effective corporation tax rate (Details)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Reconciles the statutory rate of Irish corporation tax to the Company's effective corporation tax rate      
Statutory rate of Irish corporation tax 12.50% 12.50% 12.50%
Adjustments for earnings and losses taxed at other rates (9.30%) (5.80%) (2.90%)
Other differences     0.40%
Total effective rate of taxation 3.20% 6.70% 10.00%