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Intangible Assets - Change in Carrying Value of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Beginning balance $ 89,652    
Amortization 15,783 $ 15,505 $ 20,539
Ending balance 80,188 89,652  
Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 346,860 336,840  
Additions 7,556 7,619  
Translation adjustments (8,662) 2,401  
Ending balance 345,754 346,860 336,840
Accumulated depreciation and amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 257,208 240,216  
Amortization 15,783 15,505  
Translation adjustments (7,425) 1,487  
Ending balance 265,566 257,208 240,216
Customer contracts [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 6,455    
Ending balance 3,574 6,455  
Customer contracts [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 167,094 167,001  
Translation adjustments (5,146) 93  
Ending balance 161,948 167,094 167,001
Customer contracts [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 160,639 157,976  
Amortization 2,675 2,725  
Translation adjustments (4,940) (62)  
Ending balance 158,374 160,639 157,976
Customer relationships [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 56,114    
Ending balance 52,249 56,114  
Customer relationships [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 122,862 121,922  
Translation adjustments (1,225) 940  
Ending balance 121,637 122,862 121,922
Customer relationships [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 66,748 62,175  
Amortization 3,671 3,700  
Translation adjustments (1,031) 873  
Ending balance 69,338 66,748 62,175
Intellectual property rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 176    
Ending balance 51 176  
Intellectual property rights [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 4,581 3,861  
Additions   250  
Translation adjustments (298) 470  
Ending balance 4,283 4,581 3,861
Intellectual property rights [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 4,405 3,861  
Amortization 125 74  
Translation adjustments (298) 470  
Ending balance 4,232 4,405 3,861
Trade names [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 338    
Ending balance 146 338  
Trade names [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 653 653  
Translation adjustments (6)    
Ending balance 647 653 653
Trade names [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 315 80  
Amortization 192 236  
Translation adjustments (6) (1)  
Ending balance 501 315 80
Technology [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 5,167    
Ending balance 4,335 5,167  
Technology [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 6,125 6,131  
Translation adjustments (73) (6)  
Ending balance 6,052 6,125 6,131
Technology [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 958 172  
Amortization 776 790  
Translation adjustments (17) (4)  
Ending balance 1,717 958 172
Leasehold benefits [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 1,835 1,835  
Ending balance 1,835 1,835 1,835
Leasehold benefits [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 1,835 1,835  
Ending balance 1,835 1,835 1,835
Covenant not-to-compete [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 6,175    
Ending balance 3,842 6,175  
Covenant not-to-compete [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 9,461 9,451  
Translation adjustments (172) 10  
Ending balance 9,289 9,461 9,451
Covenant not-to-compete [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 3,286 964  
Amortization 2,240 2,310  
Translation adjustments (79) 12  
Ending balance 5,447 3,286 964
Service mark [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 400    
Ending balance 400 400  
Service mark [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 400 400  
Ending balance 400 400 400
Software [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 14,827    
Ending balance 15,591 14,827  
Software [member] | Gross carrying value [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 33,849 25,586  
Additions 7,556 7,369  
Translation adjustments (1,742) 894  
Ending balance 39,663 33,849 25,586
Software [member] | Accumulated depreciation and amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 19,022 13,153  
Amortization 6,104 5,670  
Translation adjustments (1,054) 199  
Ending balance $ 24,072 $ 19,022 $ 13,153