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Loans and Borrowings - Additional Information (Detail) $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 22, 2019 USD ($) | Jul. 20, 2018 USD ($) | Mar. 14, 2018 USD ($) | Jan. 22, 2018 USD ($) | Sep. 14, 2017 USD ($) | Jul. 20, 2017 USD ($) | Jan. 31, 2017 USD ($) Installments | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) Installments
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Pledged trade receivables, other financial assets, property and equipment, intangible and other assets |  |  |  |  |  |  |  | $ 125,317 | $ 113,174
Line of credit |  |  |  |  |  |  |  | 74,274 |
Line of credit [member] | UK [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  | 12,889 |
Line of credit [member] | South Africa [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  | 1,414 |
Line of credit [member] | WNS Global Services Private Limited [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  | $ 59,971 |
Long term loan to finance acquisition of denali [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Term loan facility tenure |  |  |  |  |  |  | 3 years |  |
Term loan facility amount |  |  |  |  |  |  | $ 34,000 |  |
Interest rate basis |  |  |  |  |  |  | 3M USD Libor | 3M USD Libor |
Adjustment to interest rate basis |  |  |  |  |  |  | 1.27% | 1.27% |
Repayment installment term | Installments |  |  |  |  |  |  | 6 |  |
First five repayment installments amount |  |  |  |  |  |  | $ 5,650 |  |
Sixth and final repayment installment |  |  |  |  |  |  | $ 5,750 |  |
Repayment of installment | $ 5,650 | $ 5,650 |  | $ 5,650 |  | $ 5,650 |  |  |
Long term loan to finance acquisition of denali [member] | Fixed interest rate [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Fixed rate |  |  |  |  |  |  | 1.561% |  |
Long term loan to finance acquisition of health help [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Term loan facility tenure |  |  |  |  |  |  |  |  | 5 years
Term loan facility amount |  |  |  |  |  |  |  |  | $ 84,000
Interest rate basis |  |  |  |  |  |  |  | 3M USD Libor | 3M USD Libor
Adjustment to interest rate basis |  |  |  |  |  |  |  | 0.95% | 0.95%
Repayment installment term | Installments |  |  |  |  |  |  |  |  | 10
Repayment of installment |  |  | $ 8,400 |  | $ 8,400 |  |  |  |
Repayment installment amount |  |  |  |  |  |  |  |  | $ 8,400
Long term loan to finance acquisition of health help [member] | Fixed interest rate [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Fixed rate |  |  |  |  |  |  |  |  | 1.9635%

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