XML 173 R157.htm IDEA: XBRL DOCUMENT v3.19.1

Operating Segments - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2019 Customer Segment	Mar. 31, 2018 Customer	Mar. 31, 2017
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	0
Percentage of revenue from top customer			9.00%
Percentage of trade receivables of top customer			7.10%

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

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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 2018-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_34&doctype=Standard
-URIDate 2018-03-16

+ Details

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X

- Definition

Number of customer represent ten percent or more revenue.

+ References

No definition available.

+ Details

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Namespace Prefix:	wns_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Number of reportable segments.

+ References

No definition available.

+ Details

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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

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: