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Pension and Other Employee Obligations - Summary of Employee Benefits Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of employee benefit expenses [Line Items]      
Salaries and bonus $ 424,005 $ 405,665 $ 307,378
Employee benefit plans: Defined contribution plan 11,572 11,684 10,265
Employee benefit plans: Defined benefit plan 2,242 3,042 2,639
Share-based compensation expense 30,305 30,565 23,036
Employee benefit costs 468,124 450,956 343,318
Cost of revenue [member]      
Disclosure of employee benefit expenses [Line Items]      
Share-based compensation expense 4,278 3,770 2,765
Employee benefit costs 346,914 329,289 249,701
Selling and marketing expenses [member]      
Disclosure of employee benefit expenses [Line Items]      
Share-based compensation expense 3,983 2,557 1,723
Employee benefit costs 34,054 31,373 24,717
General and administrative expenses [member]      
Disclosure of employee benefit expenses [Line Items]      
Share-based compensation expense 22,044 24,238 18,548
Employee benefit costs $ 87,156 $ 90,294 $ 68,900