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Trade Receivables and Unbilled Revenue, Net - Summary of Trade Receivables and Unbilled Revenue (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018
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Trade and other receivables [abstract] |  |
Trade receivables and unbilled revenue | $ 141,806 | $ 133,673
Less: Allowances for ECL | (1,182) | (564)
Total | $ 140,624 | $ 133,109

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Trade receivables and unbilled revenue. + References No definition available. + Details
Name: | wns_CurrentTradeReceivablesAndUnbilledRevenue
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Current trade receivables and unbilled revenue net. + References No definition available. + Details
Name: | wns_CurrentTradeReceivablesAndUnbilledRevenueNet
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant