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Employee compensation - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disclosure Of Employee Benefits [Abstract]    
Employee benefit expense, excl. tax credits and government subsidies $ 341,851 $ 169,809
Total share-based compensation and related costs 109,066 44,755
Post-employment benefit expense, defined contribution plans $ 4,264 $ 1,436