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Revenue - Additional Information (Detail) $ in Thousands | Apr. 01, 2018 USD ($)
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Revenue [abstract] |
Contract acquisition cost capitalized | $ 6,821

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- References No definition available. + Details
Name: | ifrs-full_RevenueAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract acquisition cost capitalized during the year. + References No definition available. + Details
Name: | wns_ContractAcquisitionCostCapitalizedDuringTheYear
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration