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Other Assets - Schedule of Prepaid Expense and Other Current Assets (Parenthetical) (Detail) - CNY (¥)
¥ in Thousands
12 Months Ended
Aug. 08, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Receivables from third party payment service providers, allowance for doubtful accounts   ¥ 28,615 ¥ 23,169 ¥ 4,633 ¥ 1,222
Hangzhou China [Member] | Office Buildings [Member]          
Consideration ¥ 209,000        
Acquisition payment paid   146,300      
Acquistion payment, Installments payable   ¥ 62,700      
Construction completion, term   3 years      
Receivables from Third Party Payment Service Providers          
Receivables from third party payment service providers, allowance for doubtful accounts   ¥ 0 ¥ 0