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Related Party Transactions And Balances - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2021
CNY (¥)
Oct. 31, 2018
CNY (¥)
Sep. 30, 2018
CNY (¥)
Jun. 30, 2018
CNY (¥)
shares
Jun. 30, 2018
CNY (¥)
$ / shares
Mar. 31, 2021
CNY (¥)
shares
Mar. 31, 2021
CNY (¥)
$ / shares
Mar. 31, 2020
CNY (¥)
$ / shares
shares
Mar. 31, 2019
CNY (¥)
shares
Mar. 31, 2019
$ / shares
Mar. 31, 2021
USD ($)
Jul. 18, 2018
CNY (¥)
shares
Jul. 18, 2018
$ / shares
Related Party Transaction [Line Items]                          
Stock options exercised | shares           2,865,800   39,744,025 87,990,491        
Stock options exercised, exercise price | $ / shares             $ 0.03 $ 0.03   $ 0.01      
Stock options exercised, exercise amount                 ¥ 5,533        
Loan, repaid                 ¥ 6,236        
Strategic business recources recognized as intangible assets, total fair value           ¥ 426,005 $ 426,005 $ 813,011     $ 65,021    
Tencent Group                          
Related Party Transaction [Line Items]                          
Loan, repaid ¥ 5,323         591              
Balance due from related party           ¥ 5,914 $ 5,914            
Mr. Qi Chen                          
Related Party Transaction [Line Items]                          
Stock options exercised | shares       87,990,491                  
Stock options exercised, exercise price | $ / shares         $ 0.01                
Loan, principal amount       ¥ 6,840 $ 6,840                
Stock options exercised, exercise amount       5,533                  
Stock options exercised, related tax       ¥ 1,307                  
Loan, repaid   ¥ 604 ¥ 6,236                    
Convertible Redeemable Series C-3 Preferred Shares                          
Related Party Transaction [Line Items]                          
Convertible redeemable Series C-3 preferred shares, issued | shares                       157,047,506  
Convertible redeemable Series C-3 preferred shares, issued, price per share | $ / shares                         $ 1.0188
Convertible Redeemable Series C-3 Preferred Shares | Tencent Group                          
Related Party Transaction [Line Items]                          
Strategic business recources recognized as intangible assets, total fair value                       ¥ 1,070,624