XML 119 R103.htm IDEA: XBRL DOCUMENT
v3.19.1

Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | $ 19,081 | $ 14,983 |
Investments in marketable securities and mutual funds | 134,493 | 99,954 |
Total assets | 415,838 | 394,142 |
Derivative liabilities | 2,403 | 8,755 |
Total liabilities | 178,267 | 220,365 |
Fair value on recurring basis [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total assets | 153,573 | 114,937 |
Total liabilities | 5,600 | 20,143 |
Fair value on recurring basis [member] | Fair value through profit or loss [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in marketable securities and mutual funds | 134,493 | 99,954 |
Fair value on recurring basis [member] | Fair value through profit or loss [member] | Foreign exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 2,077 | 2,212 |
Fair value on recurring basis [member] | Financial assets at FVOCI [member] | Foreign exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 16,611 | 11,709 |
Fair value on recurring basis [member] | Financial assets at FVOCI [member] | Interest rate swap contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 392 | 1,062 |
Fair value on recurring basis [member] | Fair value through profit or loss [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contingent consideration | 3,197 | 11,388 |
Fair value on recurring basis [member] | Fair value through profit or loss [member] | Foreign exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | 308 | 946 |
Fair value on recurring basis [member] | Financial liabilities at FVOCI [member] | Foreign exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | 2,095 | 7,809 |
Fair value on recurring basis [member] | Level 1 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total assets | 134,047 | 99,412 |
Fair value on recurring basis [member] | Level 1 [member] | Fair value through profit or loss [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in marketable securities and mutual funds | 134,047 | 99,412 |
Fair value on recurring basis [member] | Level 2 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total assets | 19,526 | 15,525 |
Total liabilities | 2,403 | 8,755 |
Fair value on recurring basis [member] | Level 2 [member] | Fair value through profit or loss [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investments in marketable securities and mutual funds | 446 | 542 |
Fair value on recurring basis [member] | Level 2 [member] | Fair value through profit or loss [member] | Foreign exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 2,077 | 2,212 |
Fair value on recurring basis [member] | Level 2 [member] | Financial assets at FVOCI [member] | Foreign exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 16,611 | 11,709 |
Fair value on recurring basis [member] | Level 2 [member] | Financial assets at FVOCI [member] | Interest rate swap contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 392 | 1,062 |
Fair value on recurring basis [member] | Level 2 [member] | Fair value through profit or loss [member] | Foreign exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | 308 | 946 |
Fair value on recurring basis [member] | Level 2 [member] | Financial liabilities at FVOCI [member] | Foreign exchange contracts [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | 2,095 | 7,809 |
Fair value on recurring basis [member] | Level 3 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contingent consideration | 3,197 | 11,388 | $ 19,678
Total liabilities | 3,197 | 11,388 |
Fair value on recurring basis [member] | Level 3 [member] | Fair value through profit or loss [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contingent consideration | $ 3,197 | $ 11,388 |

X
- Definition The amount recognised as of the acquisition date for contingent consideration arrangements assumed and indemnification assets acquired in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_g_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
Name: | ifrs-full_ContingentConsiderationArrangementsAndIndemnificationAssetsRecognisedAsOfAcquisitionDate
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DerivativeFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DerivativeFinancialLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_FinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_FinancialLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Marketable securities represent liquid investments and are acquired principally for the purpose of earning daily dividend income. Investments in mutual funds represent investments in mutual fund schemes wherein the mutual fund issuer has invested these funds in enterprise development funds. These investments are current non-derivative financial assets that are designated as available for sale. + References No definition available. + Details
Name: | wns_InvestmentsInMarketableSecuritiesAndMutualFunds
Namespace Prefix: | wns_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_MeasurementAxis=ifrs-full_RecurringFairValueMeasurementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=wns_ForeignExchangeContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=ifrs-full_InterestRateSwapContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=wns_FinancialLiabilitiesMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level1OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level2OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_LevelsOfFairValueHierarchyAxis=ifrs-full_Level3OfFairValueHierarchyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |