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Impact on Adoption of New IFRS - Impact of Adoption of IFRS 15 and IFRS 9 on Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Condensed income statements, captions [line items]      
Revenue $ 809,120 $ 757,956 $ 602,546
Cost of revenue 518,236 503,130 403,324
Gross profit 290,884 254,826 199,222
Operating expenses:      
Selling and marketing expenses 44,573 41,767 32,631
General and administrative expenses 115,261 117,626 91,742
Foreign exchange gain, net (4,495) (14,973) (14,514)
Amortization of intangible assets 15,783 15,505 20,539
Operating profit 119,762 94,901 47,151
Other income, net 14,594 11,230 8,689
Finance expense 3,204 4,264 547
Profit before income taxes 131,152 101,867 55,293
Income tax expense 25,719 15,431 17,530
Profit after tax 105,433 $ 86,436 $ 37,763
Adoption Of IFRS 9 And 15 [member]      
Condensed income statements, captions [line items]      
Revenue 809,120    
Cost of revenue 518,236    
Gross profit 290,884    
Operating expenses:      
Selling and marketing expenses 44,573    
General and administrative expenses 115,261    
Foreign exchange gain, net (4,495)    
Amortization of intangible assets 15,783    
Operating profit 119,762    
Other income, net (14,594)    
Finance expense 3,204    
Profit before income taxes 131,152    
Income tax expense 25,719    
Profit after tax 105,433    
Adjustments on adoption of IFRS 15 [member]      
Condensed income statements, captions [line items]      
Cost of revenue 281    
Gross profit (281)    
Operating expenses:      
Selling and marketing expenses 1,489    
Operating profit (1,770)    
Profit before income taxes (1,770)    
Income tax expense 583    
Profit after tax (2,353)    
Adjustments on adoption of IFRS9 [member]      
Condensed income statements, captions [line items]      
Revenue 642    
Gross profit 642    
Operating expenses:      
General and administrative expenses (220)    
Foreign exchange gain, net (2,198)    
Operating profit 3,060    
Profit before income taxes 3,060    
Income tax expense 649    
Profit after tax 2,411    
Amounts (Balance) without adoption of IFRS 15 and IFRS9 [member]      
Condensed income statements, captions [line items]      
Revenue 809,762    
Cost of revenue 518,517    
Gross profit 291,245    
Operating expenses:      
Selling and marketing expenses 46,062    
General and administrative expenses 115,041    
Foreign exchange gain, net (6,693)    
Amortization of intangible assets 15,783    
Operating profit 121,052    
Other income, net (14,594)    
Finance expense 3,204    
Profit before income taxes 132,442    
Income tax expense 26,951    
Profit after tax $ 105,491