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Capital and reserves - Company repurchased (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2023
HKD ($)
Jun. 30, 2023
CNY (¥)
shares
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2023
HKD ($)
shares
Jun. 30, 2022
CNY (¥)
Dec. 31, 2023
$ / shares
shares
Capital and reserves                
Aggregate price paid | ¥ ¥ 73,560,000     ¥ 32,711,000     ¥ 82,160,000  
Hong Kong Stock Exchange                
Capital and reserves                
Number of shares repurchased | shares       166,000 166,000 166,000    
Aggregate price paid 23,930,000     ¥ 1,536,000   $ 1,696,000    
Hong Kong Stock Exchange | December 2023                
Capital and reserves                
Number of shares repurchased | shares   708,400           708,400
Aggregate price paid | $     $ 26,290,000          
New York Stock Exchange                
Capital and reserves                
Number of shares repurchased | shares       3,373,228 3,373,228 3,373,228    
Aggregate price paid ¥ 49,630,000     ¥ 31,175,000 $ 4,370,000      
New York Stock Exchange | December 2023                
Capital and reserves                
Number of shares repurchased | shares   1,450,108           1,450,108
Aggregate price paid | $   $ 6,981,000            
Minimum | Hong Kong Stock Exchange | December 2023                
Capital and reserves                
Price paid per share | $ / shares               $ 36.35
Minimum | New York Stock Exchange | December 2023                
Capital and reserves                
Price paid per share | $ / shares   $ 4.57            
Maximum | Hong Kong Stock Exchange | December 2023                
Capital and reserves                
Price paid per share | $ / shares               $ 37.85
Maximum | New York Stock Exchange | December 2023                
Capital and reserves                
Price paid per share | $ / shares   $ 4.98