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Finance Income and Costs - Schedule of Finance Income and Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure Of Finance Income Expense [Abstract]      
Interest income on term deposits $ 4,628 $ 2,845 $ 4,876
Change in fair value of financial asset measured at FVTPL   30  
Change in fair value of financial liability measured at FVTPL 350    
Other interest income 2,554 487 1,583
Net foreign exchange gain 4,568    
Finance income 12,100 3,362 6,459
Interest expense on financial liabilities measured at amortised cost 2,035 157 299
Change in fair value of financial liability measured at FVTPL   1,421  
Net foreign exchange loss   13,734 9,783
Impairment loss on trade and other receivables 358 1,563 816
Interest expense on lease liabilities [1] 1,867 2,731  
Finance and other charges 538 1,827 431
Finance costs 4,798 21,433 11,329
Net finance income (costs) $ 7,302 $ (18,071) $ (4,870)
[1] Upon adoption of IFRS 16 the Group has recognised depreciation on right-of-use assets and interest on lease liabilities instead of rent expense on leasehold properties. (refer note 14,15 and 18)