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Prepayments and other current assets - Additional Information (Detail)
¥ in Thousands, $ in Thousands
1 Months Ended 4 Months Ended 12 Months Ended 17 Months Ended
Dec. 05, 2019
Feb. 28, 2021
USD ($)
shares
Sep. 30, 2020
CNY (¥)
Jul. 31, 2020
CNY (¥)
Jun. 30, 2020
USD ($)
Jan. 31, 2020
CNY (¥)
Sep. 30, 2019
May 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Feb. 28, 2021
CNY (¥)
Mar. 31, 2021
USD ($)
Mar. 31, 2021
CNY (¥)
Mar. 31, 2020
CNY (¥)
Mar. 31, 2019
CNY (¥)
Oct. 31, 2020
CNY (¥)
Jun. 30, 2020
CNY (¥)
May 31, 2019
CNY (¥)
Prepayments And Other Current Assets [Line Items]                                  
Stock repurchased during period, value                       ¥ 31,386          
Repayments of debt                     $ 11,295 74,000 ¥ 43,533 ¥ 65,798      
Financing receivable, after allowance for credit loss, current                       3,957 35,082        
Long-term Debt                       153,641          
Proceeds from collection of loans receivable                   ¥ 600 $ 6,836 44,790 12,013 ¥ 2,500      
Interest Free Loan Agreement [Member]                                  
Prepayments And Other Current Assets [Line Items]                                  
Debt instrument, term 600 days       3 months     730 days                  
Debt instrument, face amount         $ 4,850     $ 1,400 ¥ 20,000 1,000           ¥ 33,000 ¥ 9,800
Loans receivable discounted present value                         200        
Stock repurchased during period, shares | shares   521,924                              
Stock repurchased during period, value | $   $ 4,850                              
Long-term Debt                       ¥ 600 11,400        
Four Month Agreement [Member]                                  
Prepayments And Other Current Assets [Line Items]                                  
Debt instrument, term           4 months 8 months 4 months                  
Debt instrument, face amount           ¥ 1,000   $ 1,500                 ¥ 10,800
Debt instrument, interest rate, stated percentage           6.00%   5.00%                 5.00%
Two Year Loan Agreement One [Member]                                  
Prepayments And Other Current Assets [Line Items]                                  
Debt instrument, term                 2 years                
Debt instrument, face amount                 ¥ 1,460                
Debt instrument, interest rate, stated percentage                 6.00%                
Repayments of debt                 ¥ 700           ¥ 800    
Financing receivable, after allowance for credit loss, current                         ¥ 800        
Two Year Loan Agreement Two [Member]                                  
Prepayments And Other Current Assets [Line Items]                                  
Debt instrument, term                 2 years                
Debt instrument, face amount                 ¥ 1,500                
Debt instrument, interest rate, stated percentage                 6.00%                
One Year Loan Agreement [Member]                                  
Prepayments And Other Current Assets [Line Items]                                  
Debt instrument, term       1 year                          
Debt instrument, face amount       ¥ 650                          
Debt instrument, interest rate, stated percentage       4.00%                          
Six One Year Loan Agreements [Member]                                  
Prepayments And Other Current Assets [Line Items]                                  
Debt instrument, face amount                   2,600              
Six One Year Loan Agreements [Member] | Three Percent Interest Loan [Member]                                  
Prepayments And Other Current Assets [Line Items]                                  
Debt instrument, face amount                   ¥ 1,600              
Debt instrument, interest rate, stated percentage                   3.00%              
One Year Interest Free Loan Agreement [Member]                                  
Prepayments And Other Current Assets [Line Items]                                  
Debt instrument, term     1 year                            
Debt instrument, face amount     ¥ 120