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Subsequent events (Details)
$ / shares in Units, $ / shares in Units, ¥ in Thousands
4 Months Ended 6 Months Ended 12 Months Ended
Oct. 19, 2022
USD ($)
$ / shares
shares
Oct. 19, 2022
HKD ($)
Jul. 13, 2022
HKD ($)
Oct. 19, 2022
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2022
CNY (¥)
shares
Jun. 30, 2022
CNY (¥)
shares
Oct. 20, 2022
$ / shares
Oct. 19, 2022
$ / shares
shares
Sep. 30, 2022
shares
Sep. 29, 2022
USD ($)
Jul. 13, 2022
$ / shares
shares
Jul. 11, 2022
$ / shares
Jan. 31, 2020
$ / shares
shares
Disclosure of non-adjusting events after reporting period [line items]                            
Ordinary shares, par value | $ / shares                           $ 0.00001
Number of ordinary shares issued         1,225,566,355 1,225,566,355 1,225,566,355             976,634,771
Number of shares repurchased         6,111,276 6,111,276 6,111,276             111,043,373
Purchase of treasury shares         $ 12,763,000 ¥ 82,160 ¥ 82,160              
Ordinary share transactions                            
Disclosure of non-adjusting events after reporting period [line items]                            
Ordinary shares, par value | $ / shares                       $ 0.00001    
Price per share | $     $ 13.80                      
Share repurchase program                            
Disclosure of non-adjusting events after reporting period [line items]                            
Number of shares repurchased 76,360     76,360         76,360 6,187,636        
Average price | $ / shares               $ 1.69            
Purchase of treasury shares | $       $ 129,000                    
Share repurchase program | 2022 share repurchase program                            
Disclosure of non-adjusting events after reporting period [line items]                            
Maximum repurchase amount | $                     $ 100,000,000      
Number of shares repurchased 821,620     821,620         821,620          
Average price | (per share) $ 1.27     $ 1.27         $ 10.22          
Purchase of treasury shares $ 833,000 $ 1,696,000                        
Dual primary listing | Ordinary share transactions                            
Disclosure of non-adjusting events after reporting period [line items]                            
Number of ordinary shares issued                       41,100,000    
Over-allotment option | Ordinary share transactions                            
Disclosure of non-adjusting events after reporting period [line items]                            
Number of ordinary shares issued                       486,200    
American depositary shares | Share repurchase program | 2022 share repurchase program                            
Disclosure of non-adjusting events after reporting period [line items]                            
Number of shares repurchased 655,620     655,620         655,620          
Ordinary shares | Share repurchase program | 2022 share repurchase program                            
Disclosure of non-adjusting events after reporting period [line items]                            
Number of shares repurchased 166,000     166,000         166,000          
Class A ordinary shares                            
Disclosure of non-adjusting events after reporting period [line items]                            
Ordinary shares, par value | $ / shares                         $ 0.00001  
Class B Ordinary shares                            
Disclosure of non-adjusting events after reporting period [line items]                            
Ordinary shares, par value | $ / shares                         $ 0.00001