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v3.19.1

Commitment and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Commitments and contingencies [line items] |  |  |
Rental expense | $ 35,909 | $ 33,685 | $ 27,712
Commitments net | 10,778 | 5,762 |
Bank guarantees | 1,352 | 2,579 |
Restricted time deposits | $ 564 | $ 575 |
Bottom of range [member] |  |  |
Commitments and contingencies [line items] |  |  |
Bank guarantees, remaining expiry term | 1 year |  |
Top of range [member] |  |  |
Commitments and contingencies [line items] |  |  |
Bank guarantees, remaining expiry term | 5 years |  |

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- Definition The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 14 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_14_a&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of expense recognised on rental activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_RentalExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Bank guarantees remaining expiry term. + References No definition available. + Details
Name: | wns_BankGuaranteesRemainingExpiryTerm
Namespace Prefix: | wns_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Bank guarantees held by entities within the consolidated group + References No definition available. + Details
Name: | wns_BankGuaranteesToSubsidiaries
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments and contingencies. + References No definition available. + Details
Name: | wns_CommitmentsAndContingenciesLineItems
Namespace Prefix: | wns_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of future capital expenditures that the entity is committed to make, net of advances paid to vendors. + References No definition available. + Details
Name: | wns_CommitmentsNet
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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