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Pension and Other Employee Obligations - Contributions to Defined Contribution Plans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans $ 11,684 $ 10,265 $ 7,458
India [member]      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans 8,123 7,587 5,173
Philippines [member]      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans 127 106 83
South Africa [member]      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans 860 715 617
Sri Lanka [member]      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans 625 661 612
UK [member]      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans 670 780 681
USA [Member      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans $ 1,279 $ 416 $ 292