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Summary Of Significant Accounting Polices - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
May 30, 2019
USD ($)
shares
Mar. 31, 2021
CNY (¥)
shares
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
CNY (¥)
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
CNY (¥)
Mar. 31, 2021
$ / shares
Sep. 13, 2020
USD ($)
May 28, 2020
USD ($)
Mar. 31, 2020
$ / shares
Accounting Policies [Line Items]                    
Exchange gains/(losses) | ¥   ¥ 5,574   ¥ (4,136)   ¥ (7,068)        
Other comprehensive income/(loss), Foreign currency translation adjustments   ¥ (72,993) $ (11,141) 105,433   55,440        
Convenience translation exchange rate (RMB per US $1.00)   6.5518                
Inventory write downs | ¥   ¥ 1,696   0   0        
Aggregate amount of transaction price allocated to remaining performance obligations | ¥   0                
Marketing expenses | ¥   46,676   73,795   104,311        
Government grants received | ¥   15,819   13,938   13,430        
Capital leases | ¥   0   0            
Repurchase of ordinary shares value       6,566 $ 951          
Employee benefit expenses | ¥   ¥ 30,654   ¥ 55,833   76,252        
Minimum percentage, appropriation to the statutory surplus fund of the after-tax profits   10.00% 10.00%              
Maximum percentage of the registered capital where appropriation is not required   50.00% 50.00%              
Open Market                    
Accounting Policies [Line Items]                    
Repurchase of ordinary shares value   ¥ 24,362 $ 3,642              
From Certain Shareholders                    
Accounting Policies [Line Items]                    
Repurchase of ordinary shares value   ¥ 95,496 $ 13,799              
Class A Ordinary Shares                    
Accounting Policies [Line Items]                    
Repurchase of ordinary shares | shares       10,456,075 10,456,075          
Number of ordinary shares represented by each ADS | shares 25                  
Class A Ordinary Shares | Open Market                    
Accounting Policies [Line Items]                    
Repurchase of ordinary shares | shares   44,555,900 44,555,900              
Class A Ordinary Shares | From Certain Shareholders                    
Accounting Policies [Line Items]                    
Repurchase of ordinary shares | shares   161,960,075 161,960,075              
Statutory Reserves                    
Accounting Policies [Line Items]                    
Appropriations to statutory surplus fund and other reserve funds | ¥   ¥ 701   ¥ 155   ¥ 496        
American Depository Shares [Member]                    
Accounting Policies [Line Items]                    
Repurchase of ordinary shares | shares       418,243 418,243          
Stock repurchase authorized value | $ $ 15,000             $ 10,000 $ 10,000  
Stock Repurchase Weighted Average Price | $ / shares                   $ 2.27
American Depository Shares [Member] | Open Market                    
Accounting Policies [Line Items]                    
Repurchase of ordinary shares | shares   1,782,236 1,782,236              
Stock Repurchase Weighted Average Price | $ / shares             $ 2.04      
American Depository Shares [Member] | From Certain Shareholders                    
Accounting Policies [Line Items]                    
Repurchase of ordinary shares | shares   6,478,403 6,478,403              
Stock Repurchase Weighted Average Price | $ / shares             $ 2.13      
American Depository Shares [Member] | Class A Ordinary Shares                    
Accounting Policies [Line Items]                    
Repurchase of ordinary shares | shares       418,243 418,243          
Repurchase of ordinary shares value       ¥ 6,566 $ 951          
Stock Repurchase Weighted Average Price | $ / shares                   $ 2.27
Maximum                    
Accounting Policies [Line Items]                    
Loan receivable term   12 months 12 months              
Operating lease agreements, initial lease term   5 years                
Minimum                    
Accounting Policies [Line Items]                    
Loan receivable term   1 month 1 month