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v3.19.1

Intangible Assets - Estimated Remaining Weighted Average Amortization Periods for Definite Lived Intangible Assets (Detail) - Remaining weighted average [member] | 12 Months Ended
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Mar. 31, 2019
Customer contracts [member] |
Disclosure of detailed information about intangible assets [line items] |
Estimated remaining weighted average amortization periods | 19 months
Customer relationships [member] |
Disclosure of detailed information about intangible assets [line items] |
Estimated remaining weighted average amortization periods | 196 months
Covenant not-to-compete [member] |
Disclosure of detailed information about intangible assets [line items] |
Estimated remaining weighted average amortization periods | 21 months
Trade names [member] |
Disclosure of detailed information about intangible assets [line items] |
Estimated remaining weighted average amortization periods | 10 months
Technology [member] |
Disclosure of detailed information about intangible assets [line items] |
Estimated remaining weighted average amortization periods | 68 months
Intellectual property and other rights [member] |
Disclosure of detailed information about intangible assets [line items] |
Estimated remaining weighted average amortization periods | 5 months
Software [member] |
Disclosure of detailed information about intangible assets [line items] |
Estimated remaining weighted average amortization periods | 20 months

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- 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
Name: | ifrs-full_DisclosureOfIntangibleAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The estimated remaining weighted average amortization period of intangible assets other than goodwill. + References No definition available. + Details
Name: | wns_RemainingWeightedAverageAmortizationPeriodIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | wns_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=wns_CustomerContracts1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=wns_RemainingWeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=wns_CustomerRelationships1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=wns_CovenantNotToCompeteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=wns_TradeNames1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_TechnologybasedIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=wns_IntellectualPropertyAndOtherRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |