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Financial Instruments - Summary of Movement in Allowance for Impairment in Respect of Trade and Other Receivables (Detail) - Trade and other receivables [Member] - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure Of Financial Assets [Line Items]    
Allowance account for credit losses of financial assets at beginning of period $ 2,893 $ 1,851
Allowance for impairment 358 1,563
Amounts written off against the allowance (908) (346)
Effects of movement in exchange rate 138 (175)
Allowance account for credit losses of financial assets at end of period $ 2,481 $ 2,893