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Provisions and Accrued Expenses - Summary of Provisions and Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Apr. 01, 2018	Mar. 31, 2018
Current provisions and accrued expenses [abstract]
Accrued expenses	$ 27,619		$ 28,826
Total	$ 27,619	$ 28,826	$ 28,826

X

- Definition

The amount of accruals classified as current. [Refer: Accruals]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 78
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78&doctype=Standard
-URIDate 2018-03-16

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The current amount of provisions and accrued expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	wns_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Current provisions and accrued expenses.

+ References

No definition available.

+ Details

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