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Trade Receivables, Net - Movement in Allowances for Doubtful Trade Receivable (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of financial assets [line items]      
Balance at the beginning of the year $ 1,713    
Balance at the end of the year 564 $ 1,713  
Allowances for doubtful trade receivable [member]      
Disclosure of financial assets [line items]      
Balance at the beginning of the year 1,713 4,446 $ 5,336
Charged to operations 2,115 777 1,010
Write-offs, net of collections (1,136) (2,571) (936)
Reversals (2,321) (664) (904)
Translation adjustment 193 (275) (60)
Balance at the end of the year $ 564 $ 1,713 $ 4,446