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Loss Per Share - Schedule of Computation of Potentially Anti-Dilutive Securities (Detail) - shares
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Share Options and RSUs      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from computation of diluted net loss per share 29,131,536 62,468,172 99,267,557