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Earning Per Share - Additional Information (Detail) - shares | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Earnings per share [abstract] |  |  |
Shares excluded from the calculation of diluted EPS options and RSUs since their effect is anti-dilutive | 33,025 | 27,350 | 5,200

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

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- Definition Shares excluded from computation of diluted earnings per share since their effect is anti-dilutive. + References No definition available. + Details
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Namespace Prefix: | wns_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration