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Impact on Adoption of New IFRS - Summary of Classification and Measurement of Financial Instruments on Adoption of IFRS 9 (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Apr. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Total carrying value $ 415,838   $ 394,142    
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    
IFRS9 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Total carrying value   394,142      
IAS 39 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Total carrying value   394,142      
Financial assets at amortized cost [member] | IFRS9 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Cash and cash equivalents   99,829      
Investment in fixed deposits   21,548      
Trade receivables   71,388      
Unbilled revenue   61,721      
Funds held for clients   10,066      
Prepayments and other assets   4,410      
Other non-current assets   10,243      
Fair value through profit or loss [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Total carrying value 136,570   102,166    
Investments in marketable securities and mutual funds 134,493   99,954    
Derivative assets 2,077   2,212    
Fair value through profit or loss [member] | IFRS9 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Investments in marketable securities and mutual funds   99,954      
Derivative assets   2,212      
Fair value through profit or loss [member] | IAS 39 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Derivative assets   2,212      
Financial assets at FVOCI [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Total carrying value 17,004   12,771    
Derivative assets $ 17,004   $ 12,771    
Financial assets at FVOCI [member] | IFRS9 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Derivative assets   12,771      
Loans and receivables [member] | IAS 39 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Cash and cash equivalents   99,829      
Investment in fixed deposits   21,548      
Trade receivables   71,388      
Unbilled revenue   61,721      
Funds held for clients   10,066      
Prepayments and other assets   4,410      
Other non-current assets   10,243      
Available for sale [member] | IAS 39 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Investments in marketable securities and mutual funds   99,954      
Derivative designated as cash flow hedges (carried at fair value) [member] | IAS 39 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Derivative assets   12,771      
Financial assets at fair value, class [member] | IFRS9 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Total carrying value   394,142      
Financial assets at fair value, class [member] | IAS 39 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Total carrying value   394,142      
Financial assets at fair value, class [member] | Financial assets at amortized cost [member] | IFRS9 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Cash and cash equivalents   99,829      
Investment in fixed deposits   21,548      
Trade receivables   71,388      
Unbilled revenue   61,721      
Funds held for clients   10,066      
Prepayments and other assets   4,410      
Other non-current assets   10,243      
Financial assets at fair value, class [member] | Fair value through profit or loss [member] | IFRS9 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Investments in marketable securities and mutual funds   99,954      
Derivative assets   2,212      
Financial assets at fair value, class [member] | Fair value through profit or loss [member] | IAS 39 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Derivative assets   2,212      
Financial assets at fair value, class [member] | Financial assets at FVOCI [member] | IFRS9 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Derivative assets   12,771      
Financial assets at fair value, class [member] | Loans and receivables [member] | IAS 39 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Cash and cash equivalents   99,829      
Investment in fixed deposits   21,548      
Trade receivables   71,388      
Unbilled revenue   61,721      
Funds held for clients   10,066      
Prepayments and other assets   4,410      
Other non-current assets   10,243      
Financial assets at fair value, class [member] | Available for sale [member] | IAS 39 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Investments in marketable securities and mutual funds   99,954      
Financial assets at fair value, class [member] | Derivative designated as cash flow hedges (carried at fair value) [member] | IAS 39 [member]          
Disclosure of financial assets at date of initial application of IFRS 9 [line items]          
Derivative assets   $ 12,771