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Pension and Other Employee Obligations - Summary of Net Defined Benefit Liability (Asset) (Detail)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
USD ($)
yr
Mar. 31, 2018
USD ($)
yr
Mar. 31, 2017
USD ($)
Disclosure of net defined benefit liability (asset) [line items]      
Service cost $ 1,621 $ 1,917 $ 2,188
Past service cost   538  
Interest cost 621 587 451
Accrued pension liability      
Current 854 1,189  
Non-current 10,439 8,871  
Net amount recognized 11,293 10,060  
Fair value of plan assets (1,259) (1,041)  
Net surplus (deficit) in plan $ 10,652 $ 9,377  
Weighted average duration of defined benefit obligation (both funded and unfunded) | yr 5.0 4.8  
Benefit obligations [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning of the year $ 11,101 $ 11,776  
Foreign currency translation (671) (118)  
Service cost 1,621 1,917  
Past service cost   538  
Interest cost 692 657  
Benefits paid (1,213) (1,160)  
Actuarial (gain)/loss from changes in demographic assumptions 48 62  
Actuarial (gain)/loss from changes in financial assumptions 32 (3,428)  
Actuarial (gain)/loss from actual experience compared to assumptions 942 857  
End of the year 12,552 11,101 11,776
Plan assets [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Beginning of the year 1,041 976  
Foreign currency translation (57) (5)  
Expected return on plan assets 71 70  
Benefits paid (1,129) (1,081)  
Actuarial (gain)/loss (21) (23)  
Actual contributions 1,354 1,104  
End of the year 1,259 1,041 $ 976
Present value of funded defined benefit obligation [member]      
Accrued pension liability      
Present value of defined benefit obligation 11,911 10,418  
Present value of unfunded defined benefit obligation [member]      
Accrued pension liability      
Present value of defined benefit obligation $ 641 $ 683