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Financial risk management and fair values - Currency risk - Sensitivity analysis (Details) - CNY (¥)
¥ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Other currencies      
Disclosure of nature and extent of risks arising from financial instruments      
Decrease in current year losses due to reasonably possible decrease in designated risk component   ¥ 1,000  
Currency risk | United States Dollars      
Disclosure of nature and extent of risks arising from financial instruments      
Increase in foreign exchange rates 1.00% 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 3,375 ¥ 4,324  
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (3,375) ¥ (4,324)  
Increase in accumulated losses due to reasonably possible increase in designated risk component     ¥ 4,744
Decrease in accumulated losses due to reasonably possible decrease in designated risk component     ¥ (4,744)
Currency risk | Euros      
Disclosure of nature and extent of risks arising from financial instruments      
Increase in foreign exchange rates 1.00% 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 270 ¥ 19  
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (270) ¥ (19)  
Increase in accumulated losses due to reasonably possible increase in designated risk component     ¥ (28)
Decrease in accumulated losses due to reasonably possible decrease in designated risk component     ¥ 28
Currency risk | Hong Kong Dollars      
Disclosure of nature and extent of risks arising from financial instruments      
Increase in foreign exchange rates 1.00% 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 208 ¥ 89  
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (208) ¥ (89)  
Increase in accumulated losses due to reasonably possible increase in designated risk component     ¥ 65
Decrease in accumulated losses due to reasonably possible decrease in designated risk component     ¥ (65)
Currency risk | Renminbi      
Disclosure of nature and extent of risks arising from financial instruments      
Increase in foreign exchange rates 1.00% 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 19 ¥ 20  
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (19) ¥ (20)  
Increase in accumulated losses due to reasonably possible increase in designated risk component     ¥ (16)
Decrease in accumulated losses due to reasonably possible decrease in designated risk component     ¥ 16
Currency risk | Other currencies      
Disclosure of nature and extent of risks arising from financial instruments      
Increase in foreign exchange rates 1.00% 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 25    
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (25)