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Financial risk management and fair values - Interest Rate Risk - Sensitivity analysis (Details) - Interest rate risk - CNY (¥)
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Percentage of reasonably possible increase in risk assumption 1.00% 1.00%
Percentage of reasonably possible decrease in risk assumption 1.00% 1.00%
Increase in current year losses due to reasonably possible increase in designated risk component ¥ (37,397,000) ¥ (55,880,000)
Decrease in current year losses due to reasonably possible increase in designated risk component 37,397,000 55,880,000
Increase in current year losses due to reasonably possible decrease in designated risk component (37,397,000) (55,880,000)
Decrease in current year losses due to reasonably possible decrease in designated risk component 37,397,000 55,880,000
Increase in accumulated losses due to reasonably possible increase in designated risk component (37,397,000) (55,880,000)
Decrease in accumulated losses due to reasonably possible increase in designated risk component 55,880,000 55,880,000
Increase in accumulated losses due to reasonably possible decrease in designated risk component (37,397,000) (55,880,000)
Decrease in accumulated losses due to reasonably possible decrease in designated risk component ¥ 37,397,000 ¥ 55,880,000