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Risks and Concentration - Additional Information (Detail) - Customer
1 Months Ended 12 Months Ended
Jul. 31, 2005
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Concentration Risk [Line Items]        
Appreciation (depreciation) of RMB against US$   7.30% (5.20%)  
Maximum        
Concentration Risk [Line Items]        
Appreciation (depreciation) of RMB against US$ 20.00%      
Sales Revenue, Net | Customer Concentration Risk        
Concentration Risk [Line Items]        
Number of customers with revenue greater than 10% of total revenue   0 0 0
Cost of Goods, Total | Supplier Concentration Risk        
Concentration Risk [Line Items]        
Number of suppliers with purchases greater than 10% of total purchases   0 0 0