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Financial Instruments - Summary of Other Liabilities Related to Business Combination (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure Of Financial Instruments [Abstract]    
Increase in profit or loss, Risk adjusted discount rate $ 179 $ 144
Decrease in Profit or loss, Risk adjusted discount rate $ (185) $ (149)