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Loss Per Share - Additional information (Detail) - shares
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]      
Employees share based awards were excluded from the diluted weighted average number of ordinary shares calculation 1,965,251 2,060,026 2,445,546
Ordinary shares issuable on conversion of convertible notes excluded from the diluted weighted average number of ordinary shares calculation 812,988