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Property and Equipment - Changes in Carrying Value of Property and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 60,606  
Capital work-in-progress 3,315 $ 2,366
Ending balance 60,998 60,606
Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 230,515 210,573
Additions 23,273 23,835
On acquisition (Refer Note 5(a)) 30  
Disposals/retirements (7,101) (7,400)
Translation adjustments (13,903) 3,507
Ending balance 232,814 230,515
Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 172,275 157,059
Depreciation 20,334 19,954
Disposals/retirements (6,906) (7,357)
Translation adjustments (10,572) 2,619
Ending balance 175,131 172,275
Buildings [member] | Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 10,223 10,246
Translation adjustments (260) (23)
Ending balance 9,963 10,223
Buildings [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 4,710 4,208
Depreciation 496 514
Translation adjustments (117) (12)
Ending balance 5,089 4,710
Computers and software [member] | Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 73,083 69,871
Additions 7,361 4,597
On acquisition (Refer Note 5(a)) 30  
Disposals/retirements (2,812) (3,350)
Translation adjustments (4,572) 1,965
Ending balance 73,090 73,083
Computers and software [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 64,730 59,811
Depreciation 5,437 6,442
Disposals/retirements (2,775) (3,345)
Translation adjustments (4,139) 1,822
Ending balance 63,253 64,730
Furniture, fixtures and office equipment [member] | Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 77,387 68,877
Additions 7,487 9,389
Disposals/retirements (2,856) (1,718)
Translation adjustments (4,739) 839
Ending balance 77,279 77,387
Furniture, fixtures and office equipment [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 56,892 51,431
Depreciation 7,227 6,623
Disposals/retirements (2,816) (1,674)
Translation adjustments (3,465) 512
Ending balance 57,838 56,892
Vehicles [member] | Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 656 587
Additions 328 93
Disposals/retirements (158) (29)
Translation adjustments (45) 5
Ending balance 781 656
Vehicles [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 497 429
Depreciation 150 97
Disposals/retirements (146) (30)
Translation adjustments (35) 1
Ending balance 466 497
Leasehold improvements [member] | Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 69,166 60,992
Additions 8,097 9,756
Disposals/retirements (1,275) (2,303)
Translation adjustments (4,287) 721
Ending balance 71,701 69,166
Leasehold improvements [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 45,446 41,180
Depreciation 7,024 6,278
Disposals/retirements (1,169) (2,308)
Translation adjustments (2,816) 296
Ending balance $ 48,485 $ 45,446