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Capital and reserves - Treasury shares (Details)
6 Months Ended 12 Months Ended
Dec. 31, 2023
CNY (¥)
item
shares
Jun. 30, 2023
CNY (¥)
shares
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2023
HKD ($)
shares
Dec. 31, 2022
CNY (¥)
shares
Dec. 31, 2022
USD ($)
shares
Jun. 30, 2022
CNY (¥)
shares
Sep. 15, 2023
USD ($)
Oct. 31, 2022
shares
Sep. 29, 2022
USD ($)
Sep. 21, 2022
shares
Dec. 21, 2021
USD ($)
Capital and reserves                        
Number of shares issued 1,263,689,685 1,263,689,685 1,263,689,685 1,263,689,685     1,225,566,355          
Repurchase of shares | ¥ ¥ 73,560,000 ¥ 32,711,000         ¥ 82,160,000          
2022 share repurchase program                        
Capital and reserves                        
Number of shares repurchased   3,462,868 3,462,868 3,462,868                
2021 share repurchase program                        
Capital and reserves                        
Amount authorized under share repurchase program | $                       $ 200,000,000
2023 share repurchase program 2023                        
Capital and reserves                        
Amount authorized under share repurchase program | $               $ 200,000,000        
Hong Kong Stock Exchange                        
Capital and reserves                        
Number of shares repurchased   166,000 166,000 166,000                
Repurchase of shares 23,930,000 ¥ 1,536,000   $ 1,696,000                
Hong Kong Stock Exchange | 2022 share repurchase program                        
Capital and reserves                        
Number of shares repurchased   166,000 166,000 166,000                
New York Stock Exchange                        
Capital and reserves                        
Number of shares repurchased   3,373,228 3,373,228 3,373,228                
Repurchase of shares ¥ 49,630,000 ¥ 31,175,000 $ 4,370,000                  
New York Stock Exchange | 2022 share repurchase program                        
Capital and reserves                        
Number of shares repurchased   3,296,868 3,296,868 3,296,868                
New York Stock Exchange | 2021 share repurchase program                        
Capital and reserves                        
Number of shares repurchased                     6,187,636  
Treasury shares                        
Capital and reserves                        
Number of shares issued 20,356,896 18,834,996 18,834,996 18,834,996     22,919,736          
Repurchase of shares | ¥ ¥ 73,560,000 ¥ 32,711,000         ¥ 82,160,000          
Class A ordinary shares                        
Capital and reserves                        
Number of shares issued             897,275,873          
Class A ordinary shares | Treasury shares                        
Capital and reserves                        
Amount authorized under share repurchase program | $                   $ 100,000,000    
Number of shares repurchased         6,111,276 6,111,276            
Repurchase of shares         ¥ 82,160,000 $ 12,763,000            
2020 Share Award Scheme                        
Capital and reserves                        
Number of special purpose vehicles | item 12                      
2020 Share Incentive Plan                        
Capital and reserves                        
Number of shares issued 98,773,684 98,773,684 98,773,684 98,773,684     92,586,048          
Transfer of repurchased shares                 6,187,636