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v3.19.1

Revenue - Summary of Movement in Contract Assets (Detail) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 USD ($)
Disclosure of contract assets [line items] |
Opening Balance | $ 6,240
Impact on adoption of IFRS 15 | 7,381
Adjusted opening balance | 13,621
Additions during the year | 21,222
Amortization/recognition during the year | (7,149)
Impairment loss recognized during the year | (508)
Translation adjustments | (959)
Closing Balance | 26,227
Sales Commission [member] |
Disclosure of contract assets [line items] |
Impact on adoption of IFRS 15 | 6,821
Adjusted opening balance | 6,821
Additions during the year | 3,182
Amortization/recognition during the year | (1,185)
Impairment loss recognized during the year | (508)
Translation adjustments | (279)
Closing Balance | 8,031
Transition activities [member] |
Disclosure of contract assets [line items] |
Opening Balance | 3,038
Impact on adoption of IFRS 15 | 201
Adjusted opening balance | 3,239
Additions during the year | 11,507
Amortization/recognition during the year | (1,120)
Translation adjustments | (215)
Closing Balance | 13,411
Upfront payments/other contract assets [member] |
Disclosure of contract assets [line items] |
Opening Balance | 3,202
Impact on adoption of IFRS 15 | 359
Adjusted opening balance | 3,561
Additions during the year | 6,533
Amortization/recognition during the year | (4,844)
Translation adjustments | (465)
Closing Balance | $ 4,785

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- Definition The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance). + 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_ContractAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The decrease in contract assets resulting from impairment. [Refer: Contract assets; Impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DecreaseThroughImpairmentContractAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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- Definition Amortization of contract assets. + References No definition available. + Details
Name: | wns_AmortizationOfContractAssets
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Impact on adoption of IFRS 15 in contract assets. + References No definition available. + Details
Name: | wns_ImpactOnAdoptionOfIFRS15InContractAssets
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | wns_TypesOfContractCostsAxis=wns_SalesCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | wns_TypesOfContractCostsAxis=wns_TransitionCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | wns_TypesOfContractCostsAxis=wns_UpfrontPaymentsOtherContractAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |