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Goodwill - Key Assumptions Used in Performing Impairment Test, by each CGU (Detail) | Mar. 31, 2019 | Mar. 31, 2017
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WNS global BPM [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Discount rate | 16.50% |
Perpetual growth rate | 3.00% |
South Africa [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Discount rate | 17.00% |
Perpetual growth rate | 3.00% |
Denali Sourcing Services Inc. [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Discount rate | 13.20% |
Perpetual growth rate | 2.50% |
Research and analytics [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Discount rate | 16.50% |
Perpetual growth rate | 3.00% |
HealthHelp [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Discount rate | 13.20% |
Perpetual growth rate | 2.50% |
Technology services [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Discount rate | 15.50% |
Perpetual growth rate | 2.00% |
WNS Auto Claims BPM [member] |  |
Disclosure of information for cash-generating units [line items] |  |
Discount rate | 15.50% | 13.00%
Perpetual growth rate | 2.00% |

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