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Income Tax Benefit (Expense) - Schedule of Amounts Directly Recognised in Equity (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Income Tax Relating To Components Of Equity [Abstract]      
Convertible notes, Before Tax $ 37,768 $ 0 $ 0
Convertible notes, Tax (expense) benefit (6,646) 0 0
Convertible notes, Net of tax $ 31,122 $ 0 $ 0