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Operating Segments - External Revenue and Non-current Assets (Excluding Goodwill and Intangible Assets) by Geographic Area (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of geographical areas [Line Items]      
Revenue $ 757,956 $ 602,546 $ 562,179
Non-current assets (excluding goodwill and intangible assets) 60,606 54,796  
UK [member]      
Disclosure of geographical areas [Line Items]      
Revenue 258,863 248,588 264,889
Non-current assets (excluding goodwill and intangible assets) 756 1,228  
USA [Member      
Disclosure of geographical areas [Line Items]      
Revenue 308,436 196,193 155,345
Non-current assets (excluding goodwill and intangible assets) 5,112 6,493  
India [member]      
Disclosure of geographical areas [Line Items]      
Non-current assets (excluding goodwill and intangible assets) 26,167 21,944  
South Africa [member]      
Disclosure of geographical areas [Line Items]      
Revenue 42,841 42,717 30,086
Non-current assets (excluding goodwill and intangible assets) 10,529 11,449  
Philippines [member]      
Disclosure of geographical areas [Line Items]      
Non-current assets (excluding goodwill and intangible assets) 14,050 10,583  
Rest of the world [member]      
Disclosure of geographical areas [Line Items]      
Revenue 34,021 28,501 36,819
Non-current assets (excluding goodwill and intangible assets) 3,992 3,099  
Europe (excluding UK) [member]      
Disclosure of geographical areas [Line Items]      
Revenue 47,169 37,494 34,732
Australia [member]      
Disclosure of geographical areas [Line Items]      
Revenue $ 66,626 $ 49,053 $ 40,308