XML 86 R70.htm IDEA: XBRL DOCUMENT v3.19.1

Summary of Significant Accounting Policies - Revenue Recognition - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2019
Bottom of range [member]
Disclosure of revenue [line items]
Usual payment terms	30 days
Top of range [member]
Disclosure of revenue [line items]
Usual payment terms	60 days

X

- Definition

Contracts payment terms.

+ References

No definition available.

+ Details

Name:	wns_ContractsPaymentTerms
Namespace Prefix:	wns_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Disclosure of revenue [line items]

+ References

No definition available.

+ Details

Name:	wns_DisclosureOfRevenueLineItems
Namespace Prefix:	wns_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: