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Other Assets - Schedule of Movement of Allowance For Doubtful Accounts (Detail) - CNY (¥)
¥ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Balance at beginning of year ¥ (1,522) ¥ (563) ¥ (563)
Additions (169) (959) 0
Balance at end of year ¥ (1,691) ¥ (1,522) ¥ (563)