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Income Taxes - Summary of Deferred Taxes Arising from Temporary Differences and Unused Tax Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | $ (15,583) | $ 4,113 | $ (20,733)
Additions due to acquisition during the year | 1,780 | 17 | 25,380
Recognized in statement of income | (1,807) | (9,063) | (8,255)
Recognized in equity | (46) | 1,135 | (715)
Recognized in/ Reclassified from other comprehensive income | 938 | (9,409) | 6,921
Foreign currency translation | 1,560 | (106) | 85
Closing balance | (13,066) | (15,583) | 4,113
Deferred tax liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | 15,529 | 34,530 | 5,253
Additions due to acquisition during the year |  | 6 | 24,577
Recognized in statement of income | 476 | (9,835) | (2,742)
Recognized in/ Reclassified from other comprehensive income | 1,877 | (9,409) | 6,921
Foreign currency translation | (76) | 237 | 521
Closing balance | 17,806 | 15,529 | 34,530
Deferred tax liabilities [member] | Intangible assets other than goodwill [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | 12,662 | 21,123 | (712)
Additions due to acquisition during the year |  | 6 | 24,577
Recognized in statement of income | (573) | (8,555) | (2,769)
Foreign currency translation | 94 | 88 | 27
Closing balance | 12,183 | 12,662 | 21,123
Deferred tax liabilities [member] | Unrealized gain/(loss) on cash flow hedging and investment [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | 1,759 | 12,294 | 4,857
Recognized in statement of income | 46 | (1,280) | 27
Recognized in/ Reclassified from other comprehensive income | 1,877 | (9,409) | 6,921
Foreign currency translation | (143) | 154 | 489
Closing balance | 3,539 | 1,759 | 12,294
Deferred tax liabilities [member] | Others [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | 1,108 | 1,113 | 1,108
Recognized in statement of income | 1,003 |  |
Foreign currency translation | (27) | (5) | 5
Closing balance | 2,084 | 1,108 | 1,113
Deferred tax assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | (31,112) | (30,417) | (25,986)
Additions due to acquisition during the year | 1,780 | 11 | 803
Recognized in statement of income | (2,283) | 772 | (5,513)
Recognized in equity | (46) | 1,135 | (715)
Recognized in/ Reclassified from other comprehensive income | (939) |  |
Foreign currency translation | 1,636 | (343) | (436)
Closing balance | (30,872) | (31,112) | (30,417)
Deferred tax assets [member] | Others [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | (328) | (975) | (362)
Additions due to acquisition during the year | (3) |  |
Recognized in statement of income | (174) | 661 | (679)
Foreign currency translation | 23 | (14) | 66
Closing balance | (482) | (328) | (975)
Deferred tax assets [member] | Property and equipment [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | (7,291) | (5,648) | (5,512)
Additions due to acquisition during the year |  | 11 | 873
Recognized in statement of income | (321) | (1,623) | (932)
Foreign currency translation | 539 | (31) | (77)
Closing balance | (7,073) | (7,291) | (5,648)
Deferred tax assets [member] | Net operating loss carryforward [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | (2,879) | (5,722) | (3,684)
Recognized in statement of income | 1,559 | 2,950 | (2,026)
Foreign currency translation | 33 | (107) | (12)
Closing balance | (1,287) | (2,879) | (5,722)
Deferred tax assets [member] | Accruals deductible on actual payment [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | (7,424) | (5,641) | (5,352)
Additions due to acquisition during the year | 1,783 |  | (70)
Recognized in statement of income | (1,214) | (1,661) | 1
Recognized in/ Reclassified from other comprehensive income | (939) |  |
Foreign currency translation | 436 | (122) | (220)
Closing balance | (7,358) | (7,424) | (5,641)
Deferred tax assets [member] | Share-based payment arrangements [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | (12,770) | (12,264) | (11,008)
Recognized in statement of income | (1,980) | 702 | (1,781)
Recognized in equity | (46) | 1,135 | (715)
Foreign currency translation | 584 | (73) | (190)
Closing balance | (14,120) | (12,770) | (12,264)
Deferred tax assets [member] | Minimum alternate tax [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Opening balance | (420) | (167) | (68)
Recognized in statement of income | (153) | (257) | (96)
Foreign currency translation | 21 | 4 | (3)
Closing balance | $ (552) | $ (420) | $ (167)

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