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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, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance $ (4,113) $ 20,733 $ 19,058
Additions due to acquisition during the year (17) (25,380) (837)
Recognized in statement of income 9,063 8,255 (1,565)
Recognized in equity 1,135 (715) 688
Recognized in/ Reclassified from other comprehensive income 9,409 (6,921) 4,259
Foreign currency translation 106 (85) (870)
Closing balance 15,583 (4,113) 20,733
Deferred tax liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 34,530 5,253 11,866
Additions due to acquisition during the year 6 24,577 837
Recognized in statement of income (9,835) (2,742) (2,804)
Recognized in/ Reclassified from other comprehensive income (9,409) 6,921 (4,259)
Foreign currency translation 237 521 (387)
Closing balance 15,529 34,530 5,253
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 21,123 (712) 2,045
Additions due to acquisition during the year 6 24,577 837
Recognized in statement of income (8,555) (2,769) (3,477)
Foreign currency translation 88 27 (118)
Closing balance 12,662 21,123 (712)
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 12,294 4,857 9,821
Recognized in statement of income (1,280) 27 (436)
Recognized in/ Reclassified from other comprehensive income (9,409) 6,921 (4,259)
Foreign currency translation 154 489 (269)
Closing balance 1,759 12,294 4,857
Deferred tax liabilities [member] | Others [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 1,113 1,108  
Recognized in statement of income     1,108
Foreign currency translation (5) 5  
Closing balance 1,108 1,113 1,108
Deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 30,417 25,986 30,924
Additions due to acquisition during the year (11) (803)  
Recognized in statement of income (772) 5,513 (4,369)
Recognized in equity 1,135 (715) 688
Foreign currency translation 343 436 (1,257)
Closing balance 31,112 30,417 25,986
Deferred tax assets [member] | Others [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 975 362 1,444
Recognized in statement of income (661) 679 (1,179)
Foreign currency translation 14 (66) 97
Closing balance 328 975 362
Deferred tax assets [member] | Property and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 5,648 5,512 6,538
Additions due to acquisition during the year (11) (873)  
Recognized in statement of income 1,623 932 (724)
Foreign currency translation 31 77 (302)
Closing balance 7,291 5,648 5,512
Deferred tax assets [member] | Net operating loss carryforward [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 5,722 3,684 4,304
Recognized in statement of income (2,950) 2,026 (448)
Foreign currency translation 107 12 (172)
Closing balance 2,879 5,722 3,684
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 5,641 5,352 4,201
Additions due to acquisition during the year   70  
Recognized in statement of income 1,661 (1) 1,443
Foreign currency translation 122 220 (292)
Closing balance 7,424 5,641 5,352
Deferred tax assets [member] | Share-based payment arrangements [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 12,264 11,008 6,110
Recognized in statement of income (702) 1,781 4,480
Recognized in equity 1,135 (715) 688
Foreign currency translation 73 190 (270)
Closing balance 12,770 12,264 11,008
Deferred tax assets [member] | Minimum alternate tax [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 167 68 8,327
Recognized in statement of income 257 96 (7,941)
Foreign currency translation (4) 3 (318)
Closing balance $ 420 $ 167 $ 68