XML 154 R139.htm IDEA: XBRL DOCUMENT v3.8.0.1

Operating Segments - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2018 Segment Customer	Mar. 31, 2017	Mar. 31, 2016
Disclosure of operating segments [Line Items]
Number of reportable segment | Segment	2
WNS Global BPM segment [member]
Disclosure of operating segments [Line Items]
Number of clients individually accounted for more than 10% of total revenue | Customer	0
Percentage of revenue from top customer		9.00%	10.90%
Percentage of trade receivables of top customer		7.10%	10.00%

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of the entity's revenue. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 8
-IssueDate 2017-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_34&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_PercentageOfEntitysRevenue
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of customer represent ten percent or more revenue.

+ References

No definition available.

+ Details

Name:	wns_NumberOfCustomerRepresentTenPercentOrMoreRevenue
Namespace Prefix:	wns_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of reportable segments.

+ References

No definition available.

+ Details

Name:	wns_NumberOfReportableSegments1
Namespace Prefix:	wns_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of entity's trade receivables.

+ References

No definition available.

+ Details

Name:	wns_PercentageOfEntitysTradeReceivables
Namespace Prefix:	wns_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_SegmentsAxis=wns_WNSGlobalBPMSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: