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Revenue - Summary of Revenue by Contract Type (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of revenue by contract type [line items]      
Revenue $ 809,120 $ 757,956 $ 602,546
Full-time-equivalent [member]      
Disclosure of revenue by contract type [line items]      
Revenue 522,436 473,898 432,919
Transaction [member]      
Disclosure of revenue by contract type [line items]      
Revenue 137,219 141,617 106,352
Subscription [member]      
Disclosure of revenue by contract type [line items]      
Revenue 66,542 58,916 2,139
Fixed price [member]      
Disclosure of revenue by contract type [line items]      
Revenue 42,512 39,788 27,375
Others [member]      
Disclosure of revenue by contract type [line items]      
Revenue $ 40,411 $ 43,735 $ 33,761