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Pension and Other Employee Obligations - Contributions to Defined Contribution Plans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans $ 11,572 $ 11,684 $ 10,265
India [member]      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans 7,919 8,123 7,587
Philippines [member]      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans 162 127 106
South Africa [member]      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans 840 860 715
Sri Lanka [member]      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans 505 625 661
UK [member]      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans 759 670 780
USA [Member      
Disclosure of geographical areas [Line Items]      
Contributions to defined contribution plans $ 1,387 $ 1,279 $ 416