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Financial Instruments - Carrying Value and Fair Value of Financial Instruments by Class (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | --- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Cash and cash equivalents | $ 85,444 | $ 99,829 | $ 99,829 | $ 69,803 | $ 41,854
Investment in fixed deposits | 15,907 |  | 21,548 |  |
Investments in marketable securities and mutual funds | 134,493 |  | 99,954 |  |
Trade receivables | 73,872 | 71,462 | 71,388 |  |
Unbilled revenue | 65,295 |  | 61,721 |  |
Funds held for clients | 7,063 | 10,066 | 10,066 |  |
Prepayments and other assets | 5,375 |  | 4,410 |  |
Other non-current assets | 9,308 |  | 10,243 |  |
Derivative assets | 19,081 |  | 14,983 |  |
Total carrying value | 415,838 |  | 394,142 |  |
Trade payables | 17,831 | 19,703 | 19,703 |  |
Long-term debt (includes current portion) | 61,800 |  | 89,900 |  |
Other employee obligations | 63,129 |  | 59,346 |  |
Provision and accrued expenses | 27,619 | $ 28,826 | 28,826 |  |
Other liabilities | 5,485 |  | 13,835 |  |
Derivative liabilities | 2,403 |  | 8,755 |  |
Total carrying value | 178,267 |  | 220,365 |  |
Financial liabilities at amortized cost [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Trade payables | 17,831 |  | 19,703 |  |
Long-term debt (includes current portion) | 61,800 |  | 89,900 |  |
Other employee obligations | 63,129 |  | 59,346 |  |
Provision and accrued expenses | 27,619 |  | 28,826 |  |
Other liabilities | 2,288 |  | 2,447 |  |
Total carrying value | 172,667 |  | 200,222 |  |
Fair value through profit or loss [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Other liabilities | 3,197 |  | 11,388 |  |
Derivative liabilities | 307 |  | 946 |  |
Total carrying value | 3,504 |  | 12,334 |  |
Financial liabilities at FVOCI [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative liabilities | 2,096 |  | 7,809 |  |
Total carrying value | 2,096 |  | 7,809 |  |
Financial liabilities at fair value, class [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Trade payables | 17,831 |  | 19,703 |  |
Long-term debt (includes current portion) | 61,800 |  | 89,900 |  |
Other employee obligations | 63,129 |  | 59,346 |  |
Provision and accrued expenses | 27,619 |  | 28,826 |  |
Other liabilities | 5,485 |  | 13,835 |  |
Derivative liabilities | 2,403 |  | 8,755 |  |
Total carrying value | 178,267 |  | 220,365 |  |
Financial assets at amortized cost [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Cash and cash equivalents | 85,444 |  | 99,829 |  |
Investment in fixed deposits | 15,907 |  | 21,548 |  |
Trade receivables | 73,872 |  | 71,388 |  |
Unbilled revenue | 65,295 |  | 61,721 |  |
Funds held for clients | 7,063 |  | 10,066 |  |
Prepayments and other assets | 5,375 |  | 4,410 |  |
Other non-current assets | 9,308 |  | 10,243 |  |
Total carrying value | 262,264 |  | 279,205 |  |
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 |  |
Derivative assets | 2,077 |  | 2,212 |  |
Total carrying value | 136,570 |  | 102,166 |  |
Financial assets at FVOCI [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Derivative assets | 17,004 |  | 12,771 |  |
Total carrying value | 17,004 |  | 12,771 |  |
Financial assets at fair value, class [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Cash and cash equivalents | 85,444 |  | 99,829 |  |
Investment in fixed deposits | 15,907 |  | 21,548 |  |
Investments in marketable securities and mutual funds | 134,493 |  | 99,954 |  |
Trade receivables | 73,872 |  | 71,388 |  |
Unbilled revenue | 65,295 |  | 61,721 |  |
Funds held for clients | 7,063 |  | 10,066 |  |
Prepayments and other assets | 5,375 |  | 4,410 |  |
Other non-current assets | 9,308 |  | 10,243 |  |
Derivative assets | 19,081 |  | 14,983 |  |
Total carrying value | $ 415,838 |  | $ 394,142 |  |

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