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Employee compensation - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disclosure of stock based compensation [Line Items]    
Employee benefit expense, excl. tax credits and government subsidies $ 396,926 $ 341,851
Total share-based compensation and related costs 129,304 109,066
Post-employment benefit expense, defined contribution plans 5,258 4,264
Post-employment benefit expense reversal, defined contribution plans 6,925  
Sales and marketing    
Disclosure of stock based compensation [Line Items]    
Total share-based compensation and related costs $ 47,255 $ 46,639