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Pension and Other Employee Obligations - Summary of Net Periodic Cost (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of defined benefit plans [abstract]      
Service cost $ 1,621 $ 1,917 $ 2,188
Past service cost   538  
Interest on the net defined benefit liability 621 587 451
Net gratuity cost $ 2,242 $ 3,042 $ 2,639