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Financial risk management and fair values - Currency risk - Sensitivity analysis (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Other currencies    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
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 [line items]    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 4,744  
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (4,744)  
Increase in accumulated losses due to reasonably possible increase in designated risk component   ¥ 3,242
Decrease in accumulated losses due to reasonably possible decrease in designated risk component   ¥ (3,242)
Currency risk | Euros    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 28  
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (28)  
Increase in accumulated losses due to reasonably possible increase in designated risk component   ¥ (128)
Decrease in accumulated losses due to reasonably possible decrease in designated risk component   ¥ 128
Currency risk | Hong Kong Dollars    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 65  
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (65)  
Increase in accumulated losses due to reasonably possible increase in designated risk component   ¥ 177
Decrease in accumulated losses due to reasonably possible decrease in designated risk component   ¥ (177)
Currency risk | Renminbi    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in current year losses due to reasonably possible increase in designated risk component ¥ 16  
Decrease in current year losses due to reasonably possible decrease in designated risk component ¥ (16)  
Increase in accumulated losses due to reasonably possible increase in designated risk component   ¥ (6,015)
Decrease in accumulated losses due to reasonably possible decrease in designated risk component   ¥ 6,015
Currency risk | Other currencies    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Increase in foreign exchange rates 1.00% 1.00%
Decrease in foreign exchange rates (1.00%) (1.00%)
Increase in accumulated losses due to reasonably possible increase in designated risk component   ¥ (27)
Decrease in accumulated losses due to reasonably possible decrease in designated risk component   ¥ 27