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v3.19.1

Summary of Significant Accounting Policies - Revenue Recognition - Additional Information (Detail) | 12 Months Ended
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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

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- 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: |