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Deferred and current taxation - Effective corporation tax rate (Details)
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Reconciles the statutory rate of Irish corporation tax to the Company's effective corporation tax rate      
Statutory rate of Irish corporation tax on (loss)/profits 12.50% (12.50%) (12.50%)
Non-Irish profits and losses subject to other tax rates (4.30%) (21.30%) (0.70%)
Valuation adjustments on deferred tax assets 0.30% (11.10%) 4.80%
Other movements 0.40% 1.00%  
Total effective rate of taxation on (loss)/profits 8.90% (43.90%) (8.40%)