3.24.1.1.u2 html 980 656 1 true 229 0 false 12 false false R1.htm 1001 - Document - Cover Page Sheet http://www.wns.com/role/CoverPage Cover Page Cover 1 false false R2.htm 1002 - Statement - Consolidated Statements of Financial Position Sheet http://www.wns.com/role/ConsolidatedStatementsOfFinancialPosition Consolidated Statements of Financial Position Statements 2 false false R3.htm 1003 - Statement - Consolidated Statements of Financial Position (Parenthetical) Sheet http://www.wns.com/role/ConsolidatedStatementsOfFinancialPositionParenthetical Consolidated Statements of Financial Position (Parenthetical) Statements 3 false false R4.htm 1004 - Statement - Consolidated Statements of Income Sheet http://www.wns.com/role/ConsolidatedStatementsOfIncome Consolidated Statements of Income Statements 4 false false R5.htm 1005 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.wns.com/role/ConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 1006 - Statement - Consolidated Statements of Changes in Equity Sheet http://www.wns.com/role/ConsolidatedStatementsOfChangesInEquity Consolidated Statements of Changes in Equity Statements 6 false false R7.htm 1007 - Statement - Consolidated Statements of Cash Flows Sheet http://www.wns.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 7 false false R8.htm 1008 - Statement - Consolidated Statements of Cash Flows (Parenthetical) Sheet http://www.wns.com/role/ConsolidatedStatementsOfCashFlowsParenthetical Consolidated Statements of Cash Flows (Parenthetical) Statements 8 false false R9.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 9 false false R10.htm 999001 - Disclosure - Company overview Sheet http://www.wns.com/role/CompanyOverview Company overview Notes 10 false false R11.htm 999002 - Disclosure - Summary of significant accounting policies Sheet http://www.wns.com/role/SummaryOfSignificantAccountingPolicies Summary of significant accounting policies Notes 11 false false R12.htm 999003 - Disclosure - New accounting pronouncements not yet adopted by the Company Sheet http://www.wns.com/role/NewAccountingPronouncementsNotYetAdoptedByTheCompany New accounting pronouncements not yet adopted by the Company Notes 12 false false R13.htm 999004 - Disclosure - Business Combinations Sheet http://www.wns.com/role/BusinessCombinations Business Combinations Notes 13 false false R14.htm 999005 - Disclosure - Cash and cash equivalents Sheet http://www.wns.com/role/CashAndCashEquivalents Cash and cash equivalents Notes 14 false false R15.htm 999006 - Disclosure - Investments Sheet http://www.wns.com/role/Investments Investments Notes 15 false false R16.htm 999007 - Disclosure - Trade receivables and unbilled revenue, net Sheet http://www.wns.com/role/TradeReceivablesAndUnbilledRevenueNet Trade receivables and unbilled revenue, net Notes 16 false false R17.htm 999008 - Disclosure - Prepayments and other assets Sheet http://www.wns.com/role/PrepaymentsAndOtherAssets Prepayments and other assets Notes 17 false false R18.htm 999009 - Disclosure - Goodwill Sheet http://www.wns.com/role/Goodwill Goodwill Notes 18 false false R19.htm 999010 - Disclosure - Intangible assets Sheet http://www.wns.com/role/IntangibleAssets Intangible assets Notes 19 false false R20.htm 999011 - Disclosure - Property and equipment Sheet http://www.wns.com/role/PropertyAndEquipment Property and equipment Notes 20 false false R21.htm 999012 - Disclosure - Leases Sheet http://www.wns.com/role/Leases Leases Notes 21 false false R22.htm 999013 - Disclosure - Loans and borrowings Sheet http://www.wns.com/role/LoansAndBorrowings Loans and borrowings Notes 22 false false R23.htm 999014 - Disclosure - Financial instruments Sheet http://www.wns.com/role/FinancialInstruments Financial instruments Notes 23 false false R24.htm 999015 - Disclosure - Pension and other employee obligations Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligations Pension and other employee obligations Notes 24 false false R25.htm 999016 - Disclosure - Provisions and accrued expenses Sheet http://www.wns.com/role/ProvisionsAndAccruedExpenses Provisions and accrued expenses Notes 25 false false R26.htm 999017 - Disclosure - Contract liabilities Sheet http://www.wns.com/role/ContractLiabilities Contract liabilities Notes 26 false false R27.htm 999018 - Disclosure - Other liabilities Sheet http://www.wns.com/role/OtherLiabilities Other liabilities Notes 27 false false R28.htm 999019 - Disclosure - Share capital Sheet http://www.wns.com/role/ShareCapital Share capital Notes 28 false false R29.htm 999020 - Disclosure - Revenue Sheet http://www.wns.com/role/Revenue Revenue Notes 29 false false R30.htm 999021 - Disclosure - Expenses by nature Sheet http://www.wns.com/role/ExpensesByNature Expenses by nature Notes 30 false false R31.htm 999022 - Disclosure - Finance expense Sheet http://www.wns.com/role/FinanceExpense Finance expense Notes 31 false false R32.htm 999023 - Disclosure - Other income, net Sheet http://www.wns.com/role/OtherIncomeNet Other income, net Notes 32 false false R33.htm 999024 - Disclosure - Share-based payments Sheet http://www.wns.com/role/ShareBasedPayments Share-based payments Notes 33 false false R34.htm 999025 - Disclosure - Income taxes Sheet http://www.wns.com/role/IncomeTaxes Income taxes Notes 34 false false R35.htm 999026 - Disclosure - Earnings per share Sheet http://www.wns.com/role/EarningsPerShare Earnings per share Notes 35 false false R36.htm 999027 - Disclosure - Related party Sheet http://www.wns.com/role/RelatedParty Related party Notes 36 false false R37.htm 999028 - Disclosure - Operating segments Sheet http://www.wns.com/role/OperatingSegments Operating segments Notes 37 false false R38.htm 999029 - Disclosure - Commitment and contingencies Sheet http://www.wns.com/role/CommitmentAndContingencies Commitment and contingencies Notes 38 false false R39.htm 999030 - Disclosure - Additional capital disclosures Sheet http://www.wns.com/role/AdditionalCapitalDisclosures Additional capital disclosures Notes 39 false false R40.htm 999031 - Disclosure - Summary of significant accounting policies (Policies) Sheet http://www.wns.com/role/SummaryOfSignificantAccountingPoliciesPolicies Summary of significant accounting policies (Policies) Policies 40 false false R41.htm 999032 - Disclosure - Summary of significant accounting policies (Tables) Sheet http://www.wns.com/role/SummaryOfSignificantAccountingPoliciesTables Summary of significant accounting policies (Tables) Tables http://www.wns.com/role/SummaryOfSignificantAccountingPolicies 41 false false R42.htm 999033 - Disclosure - Business Combinations (Tables) Sheet http://www.wns.com/role/BusinessCombinationsTables Business Combinations (Tables) Tables http://www.wns.com/role/BusinessCombinations 42 false false R43.htm 999034 - Disclosure - Cash and cash equivalents (Tables) Sheet http://www.wns.com/role/CashAndCashEquivalentsTables Cash and cash equivalents (Tables) Tables http://www.wns.com/role/CashAndCashEquivalents 43 false false R44.htm 999035 - Disclosure - Investments (Tables) Sheet http://www.wns.com/role/InvestmentsTables Investments (Tables) Tables http://www.wns.com/role/Investments 44 false false R45.htm 999036 - Disclosure - Trade receivables and unbilled revenue, net (Tables) Sheet http://www.wns.com/role/TradeReceivablesAndUnbilledRevenueNetTables Trade receivables and unbilled revenue, net (Tables) Tables http://www.wns.com/role/TradeReceivablesAndUnbilledRevenueNet 45 false false R46.htm 999037 - Disclosure - Prepayments and other assets (Tables) Sheet http://www.wns.com/role/PrepaymentsAndOtherAssetsTables Prepayments and other assets (Tables) Tables http://www.wns.com/role/PrepaymentsAndOtherAssets 46 false false R47.htm 999038 - Disclosure - Goodwill (Tables) Sheet http://www.wns.com/role/GoodwillTables Goodwill (Tables) Tables http://www.wns.com/role/Goodwill 47 false false R48.htm 999039 - Disclosure - Intangible assets (Tables) Sheet http://www.wns.com/role/IntangibleAssetsTables Intangible assets (Tables) Tables http://www.wns.com/role/IntangibleAssets 48 false false R49.htm 999040 - Disclosure - Property and equipment (Tables) Sheet http://www.wns.com/role/PropertyAndEquipmentTables Property and equipment (Tables) Tables http://www.wns.com/role/PropertyAndEquipment 49 false false R50.htm 999041 - Disclosure - Leases (Tables) Sheet http://www.wns.com/role/LeasesTables Leases (Tables) Tables http://www.wns.com/role/Leases 50 false false R51.htm 999042 - Disclosure - Loans and borrowings (Tables) Sheet http://www.wns.com/role/LoansAndBorrowingsTables Loans and borrowings (Tables) Tables http://www.wns.com/role/LoansAndBorrowings 51 false false R52.htm 999043 - Disclosure - Financial instruments (Tables) Sheet http://www.wns.com/role/FinancialInstrumentsTables Financial instruments (Tables) Tables http://www.wns.com/role/FinancialInstruments 52 false false R53.htm 999044 - Disclosure - Pension and other employee obligations (Tables) Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligationsTables Pension and other employee obligations (Tables) Tables http://www.wns.com/role/PensionAndOtherEmployeeObligations 53 false false R54.htm 999045 - Disclosure - Provisions and accrued expenses (Tables) Sheet http://www.wns.com/role/ProvisionsAndAccruedExpensesTables Provisions and accrued expenses (Tables) Tables http://www.wns.com/role/ProvisionsAndAccruedExpenses 54 false false R55.htm 999046 - Disclosure - Contract liabilities (Tables) Sheet http://www.wns.com/role/ContractLiabilitiesTables Contract liabilities (Tables) Tables http://www.wns.com/role/ContractLiabilities 55 false false R56.htm 999047 - Disclosure - Other liabilities (Tables) Sheet http://www.wns.com/role/OtherLiabilitiesTables Other liabilities (Tables) Tables http://www.wns.com/role/OtherLiabilities 56 false false R57.htm 999048 - Disclosure - Revenue (Tables) Sheet http://www.wns.com/role/RevenueTables Revenue (Tables) Tables http://www.wns.com/role/Revenue 57 false false R58.htm 999049 - Disclosure - Expenses by nature (Tables) Sheet http://www.wns.com/role/ExpensesByNatureTables Expenses by nature (Tables) Tables http://www.wns.com/role/ExpensesByNature 58 false false R59.htm 999050 - Disclosure - Finance expense (Tables) Sheet http://www.wns.com/role/FinanceExpenseTables Finance expense (Tables) Tables http://www.wns.com/role/FinanceExpense 59 false false R60.htm 999051 - Disclosure - Other income, net (Tables) Sheet http://www.wns.com/role/OtherIncomeNetTables Other income, net (Tables) Tables http://www.wns.com/role/OtherIncomeNet 60 false false R61.htm 999052 - Disclosure - Share-based payments (Tables) Sheet http://www.wns.com/role/ShareBasedPaymentsTables Share-based payments (Tables) Tables http://www.wns.com/role/ShareBasedPayments 61 false false R62.htm 999053 - Disclosure - Income taxes (Tables) Sheet http://www.wns.com/role/IncomeTaxesTables Income taxes (Tables) Tables http://www.wns.com/role/IncomeTaxes 62 false false R63.htm 999054 - Disclosure - Earnings per share (Tables) Sheet http://www.wns.com/role/EarningsPerShareTables Earnings per share (Tables) Tables http://www.wns.com/role/EarningsPerShare 63 false false R64.htm 999055 - Disclosure - Related party (Tables) Sheet http://www.wns.com/role/RelatedPartyTables Related party (Tables) Tables http://www.wns.com/role/RelatedParty 64 false false R65.htm 999056 - Disclosure - Operating segments (Tables) Sheet http://www.wns.com/role/OperatingSegmentsTables Operating segments (Tables) Tables http://www.wns.com/role/OperatingSegments 65 false false R66.htm 999057 - Disclosure - Additional capital disclosures (Tables) Sheet http://www.wns.com/role/AdditionalCapitalDisclosuresTables Additional capital disclosures (Tables) Tables http://www.wns.com/role/AdditionalCapitalDisclosures 66 false false R67.htm 999058 - Disclosure - Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail) Sheet http://www.wns.com/role/SummaryOfSignificantAccountingPoliciesEstimatedUsefulLivesOfPropertyAndEquipmentDetail Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail) Details 67 false false R68.htm 999059 - Disclosure - Summary of Significant Accounting Policies - Estimated Useful Life of Intangible Assets (Detail) Sheet http://www.wns.com/role/SummaryOfSignificantAccountingPoliciesEstimatedUsefulLifeOfIntangibleAssetsDetail Summary of Significant Accounting Policies - Estimated Useful Life of Intangible Assets (Detail) Details 68 false false R69.htm 999060 - Disclosure - Summary of Significant Accounting Policies - Defined Benefit Plan - Additional Information (Detail) Sheet http://www.wns.com/role/SummaryOfSignificantAccountingPoliciesDefinedBenefitPlanAdditionalInformationDetail Summary of Significant Accounting Policies - Defined Benefit Plan - Additional Information (Detail) Details 69 false false R70.htm 999061 - Disclosure - Summary of Significant Accounting Policies - Revenue Recognition - Additional Information (Detail) Sheet http://www.wns.com/role/SummaryOfSignificantAccountingPoliciesRevenueRecognitionAdditionalInformationDetail Summary of Significant Accounting Policies - Revenue Recognition - Additional Information (Detail) Details 70 false false R71.htm 999062 - Disclosure - Business Combinations - Additional Information (Detail) Sheet http://www.wns.com/role/BusinessCombinationsAdditionalInformationDetail Business Combinations - Additional Information (Detail) Details 71 false false R72.htm 999063 - Disclosure - Business Combinations - Summary Of Provisional Accounting Pending Allocation (Detail) Sheet http://www.wns.com/role/BusinessCombinationsSummaryOfProvisionalAccountingPendingAllocationDetail Business Combinations - Summary Of Provisional Accounting Pending Allocation (Detail) Details 72 false false R73.htm 999064 - Disclosure - Business Combinations - Summary Of Assets Acquired And Liabilities Assumed In The Business Combination (Detail) Sheet http://www.wns.com/role/BusinessCombinationsSummaryOfAssetsAcquiredAndLiabilitiesAssumedInTheBusinessCombinationDetail Business Combinations - Summary Of Assets Acquired And Liabilities Assumed In The Business Combination (Detail) Details 73 false false R74.htm 999065 - Disclosure - Business Combinations - Purchase Price Allocation to Assets Acquired and Liabilities Assumed of MOL IPS (Detail) Sheet http://www.wns.com/role/BusinessCombinationsPurchasePriceAllocationToAssetsAcquiredAndLiabilitiesAssumedOfMolIpsDetail Business Combinations - Purchase Price Allocation to Assets Acquired and Liabilities Assumed of MOL IPS (Detail) Details 74 false false R75.htm 999066 - Disclosure - Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) Sheet http://www.wns.com/role/CashAndCashEquivalentsSummaryOfCashAndCashEquivalentsDetail Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) Details 75 false false R76.htm 999067 - Disclosure - Investments - Summary of Investments (Detail) Sheet http://www.wns.com/role/InvestmentsSummaryOfInvestmentsDetail Investments - Summary of Investments (Detail) Details 76 false false R77.htm 999068 - Disclosure - Trade Receivables and Unbilled Revenue, Net - Summary of Trade Receivables and Unbilled Revenue (Detail) Sheet http://www.wns.com/role/TradeReceivablesAndUnbilledRevenueNetSummaryOfTradeReceivablesAndUnbilledRevenueDetail Trade Receivables and Unbilled Revenue, Net - Summary of Trade Receivables and Unbilled Revenue (Detail) Details 77 false false R78.htm 999069 - Disclosure - Trade Receivables and Unbilled Revenue, Net - Summary of Trade Receivables and Unbilled Revenue (Parenthetical) (Detail) Sheet http://www.wns.com/role/TradeReceivablesAndUnbilledRevenueNetSummaryOfTradeReceivablesAndUnbilledRevenueParentheticalDetail Trade Receivables and Unbilled Revenue, Net - Summary of Trade Receivables and Unbilled Revenue (Parenthetical) (Detail) Details 78 false false R79.htm 999070 - Disclosure - Trade Receivables and Unbilled Revenue, Net - Movement in Allowances for Expected Credit Losses (ECL) (Detail) Sheet http://www.wns.com/role/TradeReceivablesAndUnbilledRevenueNetMovementInAllowancesForExpectedCreditLossesEclDetail Trade Receivables and Unbilled Revenue, Net - Movement in Allowances for Expected Credit Losses (ECL) (Detail) Details 79 false false R80.htm 999071 - Disclosure - Prepayments and Other Assets - Summary of Prepayment and Other Assets (Detail) Sheet http://www.wns.com/role/PrepaymentsAndOtherAssetsSummaryOfPrepaymentAndOtherAssetsDetail Prepayments and Other Assets - Summary of Prepayment and Other Assets (Detail) Details 80 false false R81.htm 999072 - Disclosure - Goodwill - Summary of Movement in Goodwill by Reportable Segment (Detail) Sheet http://www.wns.com/role/GoodwillSummaryOfMovementInGoodwillByReportableSegmentDetail Goodwill - Summary of Movement in Goodwill by Reportable Segment (Detail) Details 81 false false R82.htm 999073 - Disclosure - Goodwill - Carrying Value of Goodwill Allocated to Cash Generating Units ("CGU") (Detail) Sheet http://www.wns.com/role/GoodwillCarryingValueOfGoodwillAllocatedToCashGeneratingUnitsCguDetail Goodwill - Carrying Value of Goodwill Allocated to Cash Generating Units ("CGU") (Detail) Details 82 false false R83.htm 999074 - Disclosure - Goodwill - Additional Information (Detail) Sheet http://www.wns.com/role/GoodwillAdditionalInformationDetail Goodwill - Additional Information (Detail) Details 83 false false R84.htm 999075 - Disclosure - Goodwill - Key Assumptions Used in Performing Impairment Test, by each CGU (Detail) Sheet http://www.wns.com/role/GoodwillKeyAssumptionsUsedInPerformingImpairmentTestByEachCguDetail Goodwill - Key Assumptions Used in Performing Impairment Test, by each CGU (Detail) Details 84 false false R85.htm 999076 - Disclosure - Intangible Assets - Change in Carrying Value of Intangible Assets (Detail) Sheet http://www.wns.com/role/IntangibleAssetsChangeInCarryingValueOfIntangibleAssetsDetail Intangible Assets - Change in Carrying Value of Intangible Assets (Detail) Details 85 false false R86.htm 999077 - Disclosure - Intangible Assets - Estimated Remaining Weighted Average Amortization Periods for Definite Lived Intangible Assets (Detail) Sheet http://www.wns.com/role/IntangibleAssetsEstimatedRemainingWeightedAverageAmortizationPeriodsForDefiniteLivedIntangibleAssetsDetail Intangible Assets - Estimated Remaining Weighted Average Amortization Periods for Definite Lived Intangible Assets (Detail) Details 86 false false R87.htm 999078 - Disclosure - Intangible Assets - Estimated Annual Amortization Expense (Detail) Sheet http://www.wns.com/role/IntangibleAssetsEstimatedAnnualAmortizationExpenseDetail Intangible Assets - Estimated Annual Amortization Expense (Detail) Details 87 false false R88.htm 999079 - Disclosure - Intangible Assets - Additional Information (Detail) Sheet http://www.wns.com/role/IntangibleAssetsAdditionalInformationDetail Intangible Assets - Additional Information (Detail) Details 88 false false R89.htm 999080 - Disclosure - Property and Equipment - Changes in Carrying Value of Property and Equipment (Detail) Sheet http://www.wns.com/role/PropertyAndEquipmentChangesInCarryingValueOfPropertyAndEquipmentDetail Property and Equipment - Changes in Carrying Value of Property and Equipment (Detail) Details 89 false false R90.htm 999081 - Disclosure - Leases - Summary of Changes in the Carrying Value of ROU Asset (Detail) Sheet http://www.wns.com/role/LeasesSummaryOfChangesInTheCarryingValueOfRouAssetDetail Leases - Summary of Changes in the Carrying Value of ROU Asset (Detail) Details 90 false false R91.htm 999082 - Disclosure - Leases - Additional Information (Detail) Sheet http://www.wns.com/role/LeasesAdditionalInformationDetail Leases - Additional Information (Detail) Details 91 false false R92.htm 999083 - Disclosure - Leases - Summary of Movement in Lease Liabilities (Detail) Sheet http://www.wns.com/role/LeasesSummaryOfMovementInLeaseLiabilitiesDetail Leases - Summary of Movement in Lease Liabilities (Detail) Details 92 false false R93.htm 999084 - Disclosure - Leases - Summary of Contractual Maturities of Lease Liabilities (Detail) Sheet http://www.wns.com/role/LeasesSummaryOfContractualMaturitiesOfLeaseLiabilitiesDetail Leases - Summary of Contractual Maturities of Lease Liabilities (Detail) Details 93 false false R94.htm 999085 - Disclosure - Loans and Borrowings - Summary of Long-term Loans and Borrowings (Detail) Sheet http://www.wns.com/role/LoansAndBorrowingsSummaryOfLongTermLoansAndBorrowingsDetail Loans and Borrowings - Summary of Long-term Loans and Borrowings (Detail) Details 94 false false R95.htm 999086 - Disclosure - Loans and Borrowings - Additional Information (Detail) Sheet http://www.wns.com/role/LoansAndBorrowingsAdditionalInformationDetail Loans and Borrowings - Additional Information (Detail) Details 95 false false R96.htm 999087 - Disclosure - Financial Instruments - Carrying Value and Fair Value of Financial Instruments by Class (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsCarryingValueAndFairValueOfFinancialInstrumentsByClassDetail Financial Instruments - Carrying Value and Fair Value of Financial Instruments by Class (Detail) Details 96 false false R97.htm 999088 - Disclosure - Financial Instruments - Carrying Value and Fair Value of Financial Instruments by Class (Parenthetical) (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsCarryingValueAndFairValueOfFinancialInstrumentsByClassParentheticalDetail Financial Instruments - Carrying Value and Fair Value of Financial Instruments by Class (Parenthetical) (Detail) Details 97 false false R98.htm 999089 - Disclosure - Financial Instruments - Financial Assets and Liabilities Subject to Offsetting, Enforceable Master Netting Arrangements or Similar Agreements (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsFinancialAssetsAndLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreementsDetail Financial Instruments - Financial Assets and Liabilities Subject to Offsetting, Enforceable Master Netting Arrangements or Similar Agreements (Detail) Details 98 false false R99.htm 999090 - Disclosure - Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) Details 99 false false R100.htm 999091 - Disclosure - Financial instruments - Summary of Movement in Contingent Consideration (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsSummaryOfMovementInContingentConsiderationDetail Financial instruments - Summary of Movement in Contingent Consideration (Detail) Details 100 false false R101.htm 999092 - Disclosure - Financial Instruments - Additional Information (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsAdditionalInformationDetail Financial Instruments - Additional Information (Detail) Details 101 false false R102.htm 999093 - Disclosure - Financial Instruments - Notional Values of Outstanding Foreign Exchange Forward Contracts, Foreign Exchange Option Contracts and Interest Rate Swap Contracts (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsNotionalValuesOfOutstandingForeignExchangeForwardContractsForeignExchangeOptionContractsAndInterestRateSwapContractsDetail Financial Instruments - Notional Values of Outstanding Foreign Exchange Forward Contracts, Foreign Exchange Option Contracts and Interest Rate Swap Contracts (Detail) Details 102 false false R103.htm 999094 - Disclosure - Financial Instruments - Gain/(Loss) Reclassified from Other Comprehensive Income into Consolidated Statement of Income (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsGainLossReclassifiedFromOtherComprehensiveIncomeIntoConsolidatedStatementOfIncomeDetail Financial Instruments - Gain/(Loss) Reclassified from Other Comprehensive Income into Consolidated Statement of Income (Detail) Details 103 false false R104.htm 999095 - Disclosure - Financial Instruments - Foreign Currency Risk from Non-derivative Financial Instruments (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsForeignCurrencyRiskFromNonDerivativeFinancialInstrumentsDetail Financial Instruments - Foreign Currency Risk from Non-derivative Financial Instruments (Detail) Details 104 false false R105.htm 999096 - Disclosure - Financial Instruments - Percentage of Revenue Generated from Top Customer and Top Five Customers (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsPercentageOfRevenueGeneratedFromTopCustomerAndTopFiveCustomersDetail Financial Instruments - Percentage of Revenue Generated from Top Customer and Top Five Customers (Detail) Details 105 false false R106.htm 999097 - Disclosure - Financial Instruments - Contractual Maturities of Financial Liabilities (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsContractualMaturitiesOfFinancialLiabilitiesDetail Financial Instruments - Contractual Maturities of Financial Liabilities (Detail) Details 106 false false R107.htm 999098 - Disclosure - Financial Instruments - Contractual Maturities of Financial Liabilities (Parenthetical) (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsContractualMaturitiesOfFinancialLiabilitiesParentheticalDetail Financial Instruments - Contractual Maturities of Financial Liabilities (Parenthetical) (Detail) Details 107 false false R108.htm 999099 - Disclosure - Financial Instruments - Summary of Net Cash Position (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsSummaryOfNetCashPositionDetail Financial Instruments - Summary of Net Cash Position (Detail) Details 108 false false R109.htm 999100 - Disclosure - Financial Instruments - Summary of Net Cash Position (Parenthetical) (Detail) Sheet http://www.wns.com/role/FinancialInstrumentsSummaryOfNetCashPositionParentheticalDetail Financial Instruments - Summary of Net Cash Position (Parenthetical) (Detail) Details 109 false false R110.htm 999101 - Disclosure - Pension and Other Employee Obligations - Summary of Pension and Other Employee Obligations (Detail) Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligationsSummaryOfPensionAndOtherEmployeeObligationsDetail Pension and Other Employee Obligations - Summary of Pension and Other Employee Obligations (Detail) Details 110 false false R111.htm 999102 - Disclosure - Pension and Other Employee Obligations - Summary of Employee Benefits Costs (Detail) Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligationsSummaryOfEmployeeBenefitsCostsDetail Pension and Other Employee Obligations - Summary of Employee Benefits Costs (Detail) Details 111 false false R112.htm 999103 - Disclosure - Pension and Other Employee Obligations - Contributions to Defined Contribution Plans (Detail) Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligationsContributionsToDefinedContributionPlansDetail Pension and Other Employee Obligations - Contributions to Defined Contribution Plans (Detail) Details 112 false false R113.htm 999104 - Disclosure - Pension and Other Employee Obligations - Summary of Net Periodic Cost (Detail) Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligationsSummaryOfNetPeriodicCostDetail Pension and Other Employee Obligations - Summary of Net Periodic Cost (Detail) Details 113 false false R114.htm 999105 - Disclosure - Pension and Other Employee Obligations - Summary of Net Defined Benefit Liability (Asset) (Detail) Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligationsSummaryOfNetDefinedBenefitLiabilityAssetDetail Pension and Other Employee Obligations - Summary of Net Defined Benefit Liability (Asset) (Detail) Details 114 false false R115.htm 999106 - Disclosure - Pension and Other Employee Obligations - Additional Information (Detail) Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligationsAdditionalInformationDetail Pension and Other Employee Obligations - Additional Information (Detail) Details 115 false false R116.htm 999107 - Disclosure - Pension and Other Employee Obligations - Actuarial Assumptions For Gratuity Plans (Detail) Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligationsActuarialAssumptionsForGratuityPlansDetail Pension and Other Employee Obligations - Actuarial Assumptions For Gratuity Plans (Detail) Details 116 false false R117.htm 999108 - Disclosure - Pension and Other Employee Obligations - Sensitivity of Defined Benefit Obligation to a Change in Each Significant Actuarial Assumption (Detail) Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligationsSensitivityOfDefinedBenefitObligationToAChangeInEachSignificantActuarialAssumptionDetail Pension and Other Employee Obligations - Sensitivity of Defined Benefit Obligation to a Change in Each Significant Actuarial Assumption (Detail) Details 117 false false R118.htm 999109 - Disclosure - Pension and Other Employee Obligations - Maturity Analysis of Defined Benefit Payments (Detail) Sheet http://www.wns.com/role/PensionAndOtherEmployeeObligationsMaturityAnalysisOfDefinedBenefitPaymentsDetail Pension and Other Employee Obligations - Maturity Analysis of Defined Benefit Payments (Detail) Details 118 false false R119.htm 999110 - Disclosure - Provisions and Accrued Expenses - Summary of Provisions and Accrued Expenses (Detail) Sheet http://www.wns.com/role/ProvisionsAndAccruedExpensesSummaryOfProvisionsAndAccruedExpensesDetail Provisions and Accrued Expenses - Summary of Provisions and Accrued Expenses (Detail) Details 119 false false R120.htm 999111 - Disclosure - Contract liabilities - Summary of Deferred Revenue (Detail) Sheet http://www.wns.com/role/ContractLiabilitiesSummaryOfDeferredRevenueDetail Contract liabilities - Summary of Deferred Revenue (Detail) Details 120 false false R121.htm 999112 - Disclosure - Other Liabilities - Summary of Other Liabilities (Detail) Sheet http://www.wns.com/role/OtherLiabilitiesSummaryOfOtherLiabilitiesDetail Other Liabilities - Summary of Other Liabilities (Detail) Details 121 false false R122.htm 999113 - Disclosure - Share Capital - Additional Information (Detail) Sheet http://www.wns.com/role/ShareCapitalAdditionalInformationDetail Share Capital - Additional Information (Detail) Details 122 false false R123.htm 999114 - Disclosure - Revenue - Summary of Revenue by Service Type (Detail) Sheet http://www.wns.com/role/RevenueSummaryOfRevenueByServiceTypeDetail Revenue - Summary of Revenue by Service Type (Detail) Details 123 false false R124.htm 999115 - Disclosure - Revenue - Summary of Revenue by Industry (Detail) Sheet http://www.wns.com/role/RevenueSummaryOfRevenueByIndustryDetail Revenue - Summary of Revenue by Industry (Detail) Details 124 false false R125.htm 999116 - Disclosure - Revenue - Summary of Revenue by Contract Type (Detail) Sheet http://www.wns.com/role/RevenueSummaryOfRevenueByContractTypeDetail Revenue - Summary of Revenue by Contract Type (Detail) Details 125 false false R126.htm 999117 - Disclosure - Revenue - Summary of Revenue by Delivery Location (Detail) Sheet http://www.wns.com/role/RevenueSummaryOfRevenueByDeliveryLocationDetail Revenue - Summary of Revenue by Delivery Location (Detail) Details 126 false false R127.htm 999118 - Disclosure - Revenue - Additional Information (Detail) Sheet http://www.wns.com/role/RevenueAdditionalInformationDetail Revenue - Additional Information (Detail) Details 127 false false R128.htm 999119 - Disclosure - Revenue - Summary of Movement in Contract Assets (Detail) Sheet http://www.wns.com/role/RevenueSummaryOfMovementInContractAssetsDetail Revenue - Summary of Movement in Contract Assets (Detail) Details 128 false false R129.htm 999120 - Disclosure - Revenue - Summary of Movement in Contract Liabilities (Detail) Sheet http://www.wns.com/role/RevenueSummaryOfMovementInContractLiabilitiesDetail Revenue - Summary of Movement in Contract Liabilities (Detail) Details 129 false false R130.htm 999121 - Disclosure - Revenue - Summary of revenue recognized in Contract Liabilities (Detail) Sheet http://www.wns.com/role/RevenueSummaryOfRevenueRecognizedInContractLiabilitiesDetail Revenue - Summary of revenue recognized in Contract Liabilities (Detail) Details 130 false false R131.htm 999122 - Disclosure - Revenue - Summary of Estimated Revenue Expected to be Recognized in Future Related to Remaining Performance Obligations (Detail) Sheet http://www.wns.com/role/RevenueSummaryOfEstimatedRevenueExpectedToBeRecognizedInFutureRelatedToRemainingPerformanceObligationsDetail Revenue - Summary of Estimated Revenue Expected to be Recognized in Future Related to Remaining Performance Obligations (Detail) Details 131 false false R132.htm 999123 - Disclosure - Expenses by Nature - Summary of Expenses by Nature (Detail) Sheet http://www.wns.com/role/ExpensesByNatureSummaryOfExpensesByNatureDetail Expenses by Nature - Summary of Expenses by Nature (Detail) Details 132 false false R133.htm 999124 - Disclosure - Finance Expense - Summary of Finance Expense (Detail) Sheet http://www.wns.com/role/FinanceExpenseSummaryOfFinanceExpenseDetail Finance Expense - Summary of Finance Expense (Detail) Details 133 false false R134.htm 999125 - Disclosure - Other Income, Net - Summary of Other Income, Net (Detail) Sheet http://www.wns.com/role/OtherIncomeNetSummaryOfOtherIncomeNetDetail Other Income, Net - Summary of Other Income, Net (Detail) Details 134 false false R135.htm 999126 - Disclosure - Share-based Payments - Additional Information (Detail) Sheet http://www.wns.com/role/ShareBasedPaymentsAdditionalInformationDetail Share-based Payments - Additional Information (Detail) Details 135 false false R136.htm 999127 - Disclosure - Share-based Payments - Summary of Share-based Compensation Expense (Detail) Sheet http://www.wns.com/role/ShareBasedPaymentsSummaryOfShareBasedCompensationExpenseDetail Share-based Payments - Summary of Share-based Compensation Expense (Detail) Details 136 false false R137.htm 999128 - Disclosure - Share-based Payments - Movements in Number of Restricted Share Units Dependent on Non-market Performance Condition Outstanding under 2006 and 2016 Incentive Award Plan and Related Weighted Average Fair Values (Detail) Sheet http://www.wns.com/role/ShareBasedPaymentsMovementsInNumberOfRestrictedShareUnitsDependentOnNonMarketPerformanceConditionOutstandingUnder2006And2016IncentiveAwardPlanAndRelatedWeightedAverageFairValuesDetail Share-based Payments - Movements in Number of Restricted Share Units Dependent on Non-market Performance Condition Outstanding under 2006 and 2016 Incentive Award Plan and Related Weighted Average Fair Values (Detail) Details 137 false false R138.htm 999129 - Disclosure - Share-based Payments - Movements in Number of Restricted Share Units Dependent on Market Performance Condition Outstanding under 2006 and 2016 Incentive Award Plan and Related Weighted Average Fair Values (Detail) Sheet http://www.wns.com/role/ShareBasedPaymentsMovementsInNumberOfRestrictedShareUnitsDependentOnMarketPerformanceConditionOutstandingUnder2006And2016IncentiveAwardPlanAndRelatedWeightedAverageFairValuesDetail Share-based Payments - Movements in Number of Restricted Share Units Dependent on Market Performance Condition Outstanding under 2006 and 2016 Incentive Award Plan and Related Weighted Average Fair Values (Detail) Details 138 false false R139.htm 999130 - Disclosure - Share-based Payments - Summary of RSUs related to Total Shareholder's Return ('TSR') (Detail) Sheet http://www.wns.com/role/ShareBasedPaymentsSummaryOfRsusRelatedToTotalShareholdersReturnTsrDetail Share-based Payments - Summary of RSUs related to Total Shareholder's Return ('TSR') (Detail) Details 139 false false R140.htm 999131 - Disclosure - Income Taxes - Domestic and Foreign Source Component of Profit/(Loss) Before Income Taxes (Detail) Sheet http://www.wns.com/role/IncomeTaxesDomesticAndForeignSourceComponentOfProfitLossBeforeIncomeTaxesDetail Income Taxes - Domestic and Foreign Source Component of Profit/(Loss) Before Income Taxes (Detail) Details 140 false false R141.htm 999132 - Disclosure - Income Taxes - Provision for Income Taxes (Detail) Sheet http://www.wns.com/role/IncomeTaxesProvisionForIncomeTaxesDetail Income Taxes - Provision for Income Taxes (Detail) Details 141 false false R142.htm 999133 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.wns.com/role/IncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 142 false false R143.htm 999134 - Disclosure - Income Taxes - Income Taxes Recognized Directly in Equity (Detail) Sheet http://www.wns.com/role/IncomeTaxesIncomeTaxesRecognizedDirectlyInEquityDetail Income Taxes - Income Taxes Recognized Directly in Equity (Detail) Details 143 false false R144.htm 999135 - Disclosure - Income Taxes - Income Taxes Recognized in Other Comprehensive Income (Detail) Sheet http://www.wns.com/role/IncomeTaxesIncomeTaxesRecognizedInOtherComprehensiveIncomeDetail Income Taxes - Income Taxes Recognized in Other Comprehensive Income (Detail) Details 144 false false R145.htm 999136 - Disclosure - Income Taxes - Reconciliation of Estimated Income Tax to Income Tax Expense (Detail) Sheet http://www.wns.com/role/IncomeTaxesReconciliationOfEstimatedIncomeTaxToIncomeTaxExpenseDetail Income Taxes - Reconciliation of Estimated Income Tax to Income Tax Expense (Detail) Details 145 false false R146.htm 999137 - Disclosure - Income Taxes - Summary of Deferred Taxes Arising from Temporary Differences and Unused Tax Losses (Detail) Sheet http://www.wns.com/role/IncomeTaxesSummaryOfDeferredTaxesArisingFromTemporaryDifferencesAndUnusedTaxLossesDetail Income Taxes - Summary of Deferred Taxes Arising from Temporary Differences and Unused Tax Losses (Detail) Details 146 false false R147.htm 999138 - Disclosure - Income Taxes - Deferred Tax Presented in Consolidated Statement of Financial Position (Detail) Sheet http://www.wns.com/role/IncomeTaxesDeferredTaxPresentedInConsolidatedStatementOfFinancialPositionDetail Income Taxes - Deferred Tax Presented in Consolidated Statement of Financial Position (Detail) Details 147 false false R148.htm 999139 - Disclosure - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) Sheet http://www.wns.com/role/EarningsPerShareComputationOfBasicAndDilutedEarningsPerShareDetail Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) Details 148 false false R149.htm 999140 - Disclosure - Earnings Per Share - Additional Information (Detail) Sheet http://www.wns.com/role/EarningsPerShareAdditionalInformationDetail Earnings Per Share - Additional Information (Detail) Details 149 false false R150.htm 999141 - Disclosure - Related Party - List of the Company's Subsidiaries (Detail) Sheet http://www.wns.com/role/RelatedPartyListOfTheCompanysSubsidiariesDetail Related Party - List of the Company's Subsidiaries (Detail) Details 150 false false R151.htm 999142 - Disclosure - Related Party - Key Management Personnel Compensation (Detail) Sheet http://www.wns.com/role/RelatedPartyKeyManagementPersonnelCompensationDetail Related Party - Key Management Personnel Compensation (Detail) Details 151 false false R152.htm 999143 - Disclosure - Operating Segments - Additional Information (Detail) Sheet http://www.wns.com/role/OperatingSegmentsAdditionalInformationDetail Operating Segments - Additional Information (Detail) Details 152 false false R153.htm 999144 - Disclosure - Operating Segments - Segment Results for Operating Segments (Detail) Sheet http://www.wns.com/role/OperatingSegmentsSegmentResultsForOperatingSegmentsDetail Operating Segments - Segment Results for Operating Segments (Detail) Details 153 false false R154.htm 999145 - Disclosure - Operating Segments - External Revenue and Non-current Assets (Excluding Goodwill and Intangible Assets) by Geographic Area (Detail) Sheet http://www.wns.com/role/OperatingSegmentsExternalRevenueAndNonCurrentAssetsExcludingGoodwillAndIntangibleAssetsByGeographicAreaDetail Operating Segments - External Revenue and Non-current Assets (Excluding Goodwill and Intangible Assets) by Geographic Area (Detail) Details 154 false false R155.htm 999146 - Disclosure - Commitment and Contingencies - Additional Information (Detail) Sheet http://www.wns.com/role/CommitmentAndContingenciesAdditionalInformationDetail Commitment and Contingencies - Additional Information (Detail) Details 155 false false R156.htm 999147 - Disclosure - Additional Capital Disclosures - Summary of Capital Structure (Detail) Sheet http://www.wns.com/role/AdditionalCapitalDisclosuresSummaryOfCapitalStructureDetail Additional Capital Disclosures - Summary of Capital Structure (Detail) Details 156 false false R157.htm 999148 - Disclosure - Additional Capital Disclosures - Summary of Capital Structure (Parenthetical) (Detail) Sheet http://www.wns.com/role/AdditionalCapitalDisclosuresSummaryOfCapitalStructureParentheticalDetail Additional Capital Disclosures - Summary of Capital Structure (Parenthetical) (Detail) Details 157 false false R158.htm 999149 - Disclosure - Additional Capital Disclosures - Additional Information (Detail) Sheet http://www.wns.com/role/AdditionalCapitalDisclosuresAdditionalInformationDetail Additional Capital Disclosures - Additional Information (Detail) Details 158 false false All Reports Book All Reports [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 4 fact(s) appearing in ix:hidden were eligible for transformation: dei:EntityAddressStateOrProvince, ifrs-full:IncreaseThroughBusinessCombinationsContractLiabilities, ifrs-full:TemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVentures, wns:BankGuaranteesRemainingExpiryTerm - d187090d20f.htm 9, 20416 d187090d20f.htm wns-20240331.xsd wns-20240331_cal.xml wns-20240331_def.xml wns-20240331_lab.xml wns-20240331_pre.xml g187090g0506075927536.jpg g187090g0506083407979.jpg http://xbrl.sec.gov/dei/2023 http://xbrl.sec.gov/ecd/2023 https://xbrl.ifrs.org/taxonomy/2023-03-23/ifrs-full true true