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Goodwill - Carrying Value of Goodwill Allocated to Cash Generating Units ("CGU") (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | --- | --- | ---
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | $ 130,811 | $ 135,186 | $ 135,186 |
WNS global BPM [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 3,846 |  | 3,815 |
South Africa [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 4,557 |  | 5,581 |
Research and analytics [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 46,087 |  | 48,901 |
Technology services [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 3,382 |  | 3,632 |
WNS Auto Claims BPM [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 4,315 |  | 4,633 | $ 4,130
Denali Sourcing Services Inc. [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 29,542 |  | 29,542 |
HealthHelp [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | $ 39,082 |  | $ 39,082 |

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