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Financial Instruments - Carrying Value and Fair Value of Financial Instruments by Class (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Apr. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of detailed information about financial instruments [line items]          
Cash and cash equivalents $ 85,444 $ 99,829 $ 99,829 $ 69,803 $ 41,854
Investment in fixed deposits 15,907   21,548    
Investments in marketable securities and mutual funds 134,493   99,954    
Trade receivables 73,872 71,462 71,388    
Unbilled revenue 65,295   61,721    
Funds held for clients 7,063 10,066 10,066    
Prepayments and other assets 5,375   4,410    
Other non-current assets 9,308   10,243    
Derivative assets 19,081   14,983    
Total carrying value 415,838   394,142    
Trade payables 17,831 19,703 19,703    
Long-term debt (includes current portion) 61,800   89,900    
Other employee obligations 63,129   59,346    
Provision and accrued expenses 27,619 $ 28,826 28,826    
Other liabilities 5,485   13,835    
Derivative liabilities 2,403   8,755    
Total carrying value 178,267   220,365    
Financial liabilities at amortized cost [member]          
Disclosure of detailed information about financial instruments [line items]          
Trade payables 17,831   19,703    
Long-term debt (includes current portion) 61,800   89,900    
Other employee obligations 63,129   59,346    
Provision and accrued expenses 27,619   28,826    
Other liabilities 2,288   2,447    
Total carrying value 172,667   200,222    
Fair value through profit or loss [member]          
Disclosure of detailed information about financial instruments [line items]          
Other liabilities 3,197   11,388    
Derivative liabilities 307   946    
Total carrying value 3,504   12,334    
Financial liabilities at FVOCI [member]          
Disclosure of detailed information about financial instruments [line items]          
Derivative liabilities 2,096   7,809    
Total carrying value 2,096   7,809    
Financial liabilities at fair value, class [member]          
Disclosure of detailed information about financial instruments [line items]          
Trade payables 17,831   19,703    
Long-term debt (includes current portion) 61,800   89,900    
Other employee obligations 63,129   59,346    
Provision and accrued expenses 27,619   28,826    
Other liabilities 5,485   13,835    
Derivative liabilities 2,403   8,755    
Total carrying value 178,267   220,365    
Financial assets at amortized cost [member]          
Disclosure of detailed information about financial instruments [line items]          
Cash and cash equivalents 85,444   99,829    
Investment in fixed deposits 15,907   21,548    
Trade receivables 73,872   71,388    
Unbilled revenue 65,295   61,721    
Funds held for clients 7,063   10,066    
Prepayments and other assets 5,375   4,410    
Other non-current assets 9,308   10,243    
Total carrying value 262,264   279,205    
Fair value through profit or loss [member]          
Disclosure of detailed information about financial instruments [line items]          
Investments in marketable securities and mutual funds 134,493   99,954    
Derivative assets 2,077   2,212    
Total carrying value 136,570   102,166    
Financial assets at FVOCI [member]          
Disclosure of detailed information about financial instruments [line items]          
Derivative assets 17,004   12,771    
Total carrying value 17,004   12,771    
Financial assets at fair value, class [member]          
Disclosure of detailed information about financial instruments [line items]          
Cash and cash equivalents 85,444   99,829    
Investment in fixed deposits 15,907   21,548    
Investments in marketable securities and mutual funds 134,493   99,954    
Trade receivables 73,872   71,388    
Unbilled revenue 65,295   61,721    
Funds held for clients 7,063   10,066    
Prepayments and other assets 5,375   4,410    
Other non-current assets 9,308   10,243    
Derivative assets 19,081   14,983    
Total carrying value $ 415,838   $ 394,142