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Revenue - Summary of Movement in Contract Liabilities (Detail) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 USD ($)
Disclosure of contract liabilities [line items] |
Opening balance | $ 3,479
Impact on offset with trade receivables and unbilled revenue | 5,253
Gross opening balance | 8,732
Impact on adoption of IFRS 15 | 64
Adjusted opening balance | 8,796
Additions during the year | 67,976
Revenue recognized during the year | (54,920)
Translation adjustments | (543)
Gross closing balance | 21,309
Impact on offset with trade receivables and unbilled revenue | (9,273)
Closing balance | 12,036
Payments in advance of services [member] |
Disclosure of contract liabilities [line items] |
Opening balance | 1,107
Impact on offset with trade receivables and unbilled revenue | 115
Gross opening balance | 1,222
Impact on adoption of IFRS 15 | 64
Adjusted opening balance | 1,286
Additions during the year | 11,175
Revenue recognized during the year | (2,918)
Translation adjustments | (109)
Gross closing balance | 9,434
Impact on offset with trade receivables and unbilled revenue | (2,255)
Closing balance | 7,179
Advance billings [member] |
Disclosure of contract liabilities [line items] |
Opening balance | 2,106
Impact on offset with trade receivables and unbilled revenue | 4,345
Gross opening balance | 6,451
Adjusted opening balance | 6,451
Additions during the year | 44,940
Revenue recognized during the year | (39,927)
Translation adjustments | (351)
Gross closing balance | 11,113
Impact on offset with trade receivables and unbilled revenue | (6,379)
Closing balance | 4,734
Others [member] |
Disclosure of contract liabilities [line items] |
Opening balance | 266
Impact on offset with trade receivables and unbilled revenue | 793
Gross opening balance | 1,059
Adjusted opening balance | 1,059
Additions during the year | 11,861
Revenue recognized during the year | (12,075)
Translation adjustments | (83)
Gross closing balance | 762
Impact on offset with trade receivables and unbilled revenue | (639)
Closing balance | $ 123

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- Definition The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ContractLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Additions in contract liabilities. + References No definition available. + Details
Name: | wns_AdditionsInContractLiabilities
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Adjusted contract liability. + References No definition available. + Details
Name: | wns_AdjustedContractLiability
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract with customer liability revenue recognized. + References No definition available. + Details
Name: | wns_ContractWithCustomerLiabilityRevenueRecognized1
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of contract liabilities. + References No definition available. + Details
Name: | wns_DisclosureOfContractLiabilitiesLineItems
Namespace Prefix: | wns_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross contract liabilities. + References No definition available. + Details
Name: | wns_GrossContractLiabilities
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Impact on adoption of IFRS 15 in contract liabilities. + References No definition available. + Details
Name: | wns_ImpactOnAdoptionOfIFRS15InContractLiabilities
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Impact on balance sheet offset. + References No definition available. + Details
Name: | wns_ImpactOnBalanceSheetOffset
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Translation adjustments on contract liabilities. + References No definition available. + Details
Name: | wns_TranslationAdjustmentsOnContractLiabilities
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | wns_TypesOfFinanceCostOrIncomeAxis=wns_PaymentInAdvanceOfServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | wns_TypesOfFinanceCostOrIncomeAxis=wns_AdvanceBillingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | wns_TypesOfFinanceCostOrIncomeAxis=wns_OtherContractLiabilitiesAdjustmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |