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Impact on Adoption of New IFRS - Summary of Classification and Measurement of Financial Instruments on Adoption of IFRS 9 (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
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Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Total carrying value | $ 415,838 |  | $ 394,142 |  |
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 |  |
IFRS9 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Total carrying value |  | 394,142 |  |  |
IAS 39 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Total carrying value |  | 394,142 |  |  |
Financial assets at amortized cost [member] | IFRS9 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Cash and cash equivalents |  | 99,829 |  |  |
Investment in fixed deposits |  | 21,548 |  |  |
Trade receivables |  | 71,388 |  |  |
Unbilled revenue |  | 61,721 |  |  |
Funds held for clients |  | 10,066 |  |  |
Prepayments and other assets |  | 4,410 |  |  |
Other non-current assets |  | 10,243 |  |  |
Fair value through profit or loss [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Total carrying value | 136,570 |  | 102,166 |  |
Investments in marketable securities and mutual funds | 134,493 |  | 99,954 |  |
Derivative assets | 2,077 |  | 2,212 |  |
Fair value through profit or loss [member] | IFRS9 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Investments in marketable securities and mutual funds |  | 99,954 |  |  |
Derivative assets |  | 2,212 |  |  |
Fair value through profit or loss [member] | IAS 39 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Derivative assets |  | 2,212 |  |  |
Financial assets at FVOCI [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Total carrying value | 17,004 |  | 12,771 |  |
Derivative assets | $ 17,004 |  | $ 12,771 |  |
Financial assets at FVOCI [member] | IFRS9 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Derivative assets |  | 12,771 |  |  |
Loans and receivables [member] | IAS 39 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Cash and cash equivalents |  | 99,829 |  |  |
Investment in fixed deposits |  | 21,548 |  |  |
Trade receivables |  | 71,388 |  |  |
Unbilled revenue |  | 61,721 |  |  |
Funds held for clients |  | 10,066 |  |  |
Prepayments and other assets |  | 4,410 |  |  |
Other non-current assets |  | 10,243 |  |  |
Available for sale [member] | IAS 39 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Investments in marketable securities and mutual funds |  | 99,954 |  |  |
Derivative designated as cash flow hedges (carried at fair value) [member] | IAS 39 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Derivative assets |  | 12,771 |  |  |
Financial assets at fair value, class [member] | IFRS9 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Total carrying value |  | 394,142 |  |  |
Financial assets at fair value, class [member] | IAS 39 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Total carrying value |  | 394,142 |  |  |
Financial assets at fair value, class [member] | Financial assets at amortized cost [member] | IFRS9 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Cash and cash equivalents |  | 99,829 |  |  |
Investment in fixed deposits |  | 21,548 |  |  |
Trade receivables |  | 71,388 |  |  |
Unbilled revenue |  | 61,721 |  |  |
Funds held for clients |  | 10,066 |  |  |
Prepayments and other assets |  | 4,410 |  |  |
Other non-current assets |  | 10,243 |  |  |
Financial assets at fair value, class [member] | Fair value through profit or loss [member] | IFRS9 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Investments in marketable securities and mutual funds |  | 99,954 |  |  |
Derivative assets |  | 2,212 |  |  |
Financial assets at fair value, class [member] | Fair value through profit or loss [member] | IAS 39 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Derivative assets |  | 2,212 |  |  |
Financial assets at fair value, class [member] | Financial assets at FVOCI [member] | IFRS9 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Derivative assets |  | 12,771 |  |  |
Financial assets at fair value, class [member] | Loans and receivables [member] | IAS 39 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Cash and cash equivalents |  | 99,829 |  |  |
Investment in fixed deposits |  | 21,548 |  |  |
Trade receivables |  | 71,388 |  |  |
Unbilled revenue |  | 61,721 |  |  |
Funds held for clients |  | 10,066 |  |  |
Prepayments and other assets |  | 4,410 |  |  |
Other non-current assets |  | 10,243 |  |  |
Financial assets at fair value, class [member] | Available for sale [member] | IAS 39 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Investments in marketable securities and mutual funds |  | 99,954 |  |  |
Financial assets at fair value, class [member] | Derivative designated as cash flow hedges (carried at fair value) [member] | IAS 39 [member] |  |  |  |  |
Disclosure of financial assets at date of initial application of IFRS 9 [line items] |  |  |  |  |
Derivative assets |  | $ 12,771 |  |  |

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