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Trade Receivables and Unbilled Revenue, Net - Movement in Allowances for Expected Credit Losses (ECL) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of financial assets [line items]      
Balance at the beginning of the year $ 564    
Balance at the end of the year 1,182 $ 564  
Allowances for expected credit losses [member]      
Disclosure of financial assets [line items]      
Balance at the beginning of the year 564 1,713 $ 4,446
Charged to profit or loss 1,171 2,115 777
Write-offs, net of collections (331) (1,136) (2,571)
Reversals (157) (2,321) (664)
Translation adjustment 9 193 (275)
Balance at the end of the year 1,182 564 $ 1,713
Allowances for expected credit losses [member] | Previously stated [member]      
Disclosure of financial assets [line items]      
Balance at the beginning of the year 564    
Balance at the end of the year   564  
Allowances for expected credit losses [member] | Adoption of IFRS 9 [member]      
Disclosure of financial assets [line items]      
Balance at the beginning of the year 74    
Balance at the end of the year   74  
Allowances for expected credit losses [member] | Adjusted [member]      
Disclosure of financial assets [line items]      
Balance at the beginning of the year $ 490    
Balance at the end of the year   $ 490