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Pension and Other Employee Obligations - Summary of Employee Benefits Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of employee benefit expenses [Line Items]      
Salaries and bonus $ 405,665 $ 307,378 $ 272,017
Employee benefit plans: Defined contribution plan 11,684 10,265 7,458
Employee benefit plans: Defined benefit plan 3,042 2,639 2,184
Share-based compensation expense 30,565 23,036 17,919
Employee benefit costs 450,956 343,318 299,578
Cost of revenue [member]      
Disclosure of employee benefit expenses [Line Items]      
Share-based compensation expense 3,770 2,765 1,923
Employee benefit costs 329,289 249,701 217,098
Selling and marketing expenses [member]      
Disclosure of employee benefit expenses [Line Items]      
Share-based compensation expense 2,557 1,723 1,370
Employee benefit costs 31,373 24,717 22,336
General and administrative expenses [member]      
Disclosure of employee benefit expenses [Line Items]      
Share-based compensation expense 24,238 18,548 14,626
Employee benefit costs $ 90,294 $ 68,900 $ 60,144