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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
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

X

- 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

Name:	ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_TradeAndOtherReceivablesAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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