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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, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Disclosure of geographical areas [Line Items] |  |  |
Revenue | $ 809,120 | $ 757,956 | $ 602,546
Non-current assets (excluding goodwill and intangible assets) | 60,998 | 60,606 |
UK [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Revenue | 253,962 | 258,863 | 248,588
Non-current assets (excluding goodwill and intangible assets) | 2,144 | 756 |
USA [Member |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Revenue | 335,880 | 308,436 | 196,193
Non-current assets (excluding goodwill and intangible assets) | 3,777 | 5,112 |
India [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Non-current assets (excluding goodwill and intangible assets) | 26,708 | 26,167 |
South Africa [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Revenue | 38,866 | 42,841 | 42,717
Non-current assets (excluding goodwill and intangible assets) | 6,374 | 10,529 |
Philippines [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Non-current assets (excluding goodwill and intangible assets) | 18,797 | 14,050 |
Rest of the world [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Revenue | 46,842 | 34,021 | 28,501
Non-current assets (excluding goodwill and intangible assets) | 3,198 | 3,992 |
Europe (excluding UK) [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Revenue | 56,383 | 47,169 | 37,494
Australia [member] |  |  |
Disclosure of geographical areas [Line Items] |  |  |
Revenue | $ 77,187 | $ 66,626 | $ 49,053

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