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Property and Equipment - Changes in Carrying Value of Property and Equipment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 54,796  
Capital work-in-progress 2,366 $ 1,282
Ending balance 60,606 54,796
Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 210,573 193,261
Additions 23,835 20,106
On acquisition   4,743
Disposals/retirements (7,400) (6,782)
Translation adjustments 3,507 (755)
Ending balance 230,515 210,573
Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 157,059 147,025
Depreciation 19,954 16,903
Disposals/retirements (7,357) (5,942)
Translation adjustments 2,619 (927)
Ending balance 172,275 157,059
Buildings [member] | Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 10,246 10,150
Translation adjustments (23) 96
Ending balance 10,223 10,246
Buildings [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 4,208 3,661
Depreciation 514 505
Translation adjustments (12) 42
Ending balance 4,710 4,208
Computers and software [member] | Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 69,871 69,203
Additions 4,597 4,411
On acquisition   1,014
Disposals/retirements (3,350) (3,407)
Translation adjustments 1,965 (1,350)
Ending balance 73,083 69,871
Computers and software [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 59,811 58,768
Depreciation 6,442 5,742
Disposals/retirements (3,345) (3,327)
Translation adjustments 1,822 (1,372)
Ending balance 64,730 59,811
Furniture, fixtures and office equipment [member] | Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 68,877 60,860
Additions 9,389 7,455
On acquisition   1,895
Disposals/retirements (1,718) (1,619)
Translation adjustments 839 286
Ending balance 77,387 68,877
Furniture, fixtures and office equipment [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 51,431 47,375
Depreciation 6,623 5,126
Disposals/retirements (1,674) (1,241)
Translation adjustments 512 171
Ending balance 56,892 51,431
Vehicles [member] | Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 587 459
Additions 93 135
On acquisition   14
Disposals/retirements (29) (33)
Translation adjustments 5 12
Ending balance 656 587
Vehicles [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 429 347
Depreciation 97 92
Disposals/retirements (30) (20)
Translation adjustments 1 10
Ending balance 497 429
Leasehold improvements [member] | Gross carrying value [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 60,992 52,589
Additions 9,756 8,105
On acquisition   1,820
Disposals/retirements (2,303) (1,723)
Translation adjustments 721 201
Ending balance 69,166 60,992
Leasehold improvements [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 41,180 36,874
Depreciation 6,278 5,438
Disposals/retirements (2,308) (1,354)
Translation adjustments 296 222
Ending balance $ 45,446 $ 41,180