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Impact on Adoption of New IFRS - Impact of Adoption of IFRS 15 and IFRS 9 on Consolidated Statement of Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Condensed income statements, captions [line items] |  |  |
Revenue | $ 809,120 | $ 757,956 | $ 602,546
Cost of revenue | 518,236 | 503,130 | 403,324
Gross profit | 290,884 | 254,826 | 199,222
Operating expenses: |  |  |
Selling and marketing expenses | 44,573 | 41,767 | 32,631
General and administrative expenses | 115,261 | 117,626 | 91,742
Foreign exchange gain, net | (4,495) | (14,973) | (14,514)
Amortization of intangible assets | 15,783 | 15,505 | 20,539
Operating profit | 119,762 | 94,901 | 47,151
Other income, net | 14,594 | 11,230 | 8,689
Finance expense | 3,204 | 4,264 | 547
Profit before income taxes | 131,152 | 101,867 | 55,293
Income tax expense | 25,719 | 15,431 | 17,530
Profit after tax | 105,433 | $ 86,436 | $ 37,763
Adoption Of IFRS 9 And 15 [member] |  |  |
Condensed income statements, captions [line items] |  |  |
Revenue | 809,120 |  |
Cost of revenue | 518,236 |  |
Gross profit | 290,884 |  |
Operating expenses: |  |  |
Selling and marketing expenses | 44,573 |  |
General and administrative expenses | 115,261 |  |
Foreign exchange gain, net | (4,495) |  |
Amortization of intangible assets | 15,783 |  |
Operating profit | 119,762 |  |
Other income, net | (14,594) |  |
Finance expense | 3,204 |  |
Profit before income taxes | 131,152 |  |
Income tax expense | 25,719 |  |
Profit after tax | 105,433 |  |
Adjustments on adoption of IFRS 15 [member] |  |  |
Condensed income statements, captions [line items] |  |  |
Cost of revenue | 281 |  |
Gross profit | (281) |  |
Operating expenses: |  |  |
Selling and marketing expenses | 1,489 |  |
Operating profit | (1,770) |  |
Profit before income taxes | (1,770) |  |
Income tax expense | 583 |  |
Profit after tax | (2,353) |  |
Adjustments on adoption of IFRS9 [member] |  |  |
Condensed income statements, captions [line items] |  |  |
Revenue | 642 |  |
Gross profit | 642 |  |
Operating expenses: |  |  |
General and administrative expenses | (220) |  |
Foreign exchange gain, net | (2,198) |  |
Operating profit | 3,060 |  |
Profit before income taxes | 3,060 |  |
Income tax expense | 649 |  |
Profit after tax | 2,411 |  |
Amounts (Balance) without adoption of IFRS 15 and IFRS9 [member] |  |  |
Condensed income statements, captions [line items] |  |  |
Revenue | 809,762 |  |
Cost of revenue | 518,517 |  |
Gross profit | 291,245 |  |
Operating expenses: |  |  |
Selling and marketing expenses | 46,062 |  |
General and administrative expenses | 115,041 |  |
Foreign exchange gain, net | (6,693) |  |
Amortization of intangible assets | 15,783 |  |
Operating profit | 121,052 |  |
Other income, net | (14,594) |  |
Finance expense | 3,204 |  |
Profit before income taxes | 132,442 |  |
Income tax expense | 26,951 |  |
Profit after tax | $ 105,491 |  |

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