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Financial risk management and fair values - Interest Rate Risk - Sensitivity analysis (Details) - Interest rate risk - CNY (¥)
 6 Months Ended 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Disclosure of nature and extent of risks arising from financial instruments      
Percentage of reasonably possible increase in risk assumption 1.00% 1.00% 1.00%
Percentage of reasonably possible decrease in risk assumption 1.00% 1.00% 1.00%
Increase in current year losses due to reasonably possible increase in designated risk component ¥ (42,401,000) ¥ (42,401,000) ¥ (37,397,000)
Decrease in current year losses due to reasonably possible increase in designated risk component 24,363,000 42,401,000 37,397,000
Increase in current year losses due to reasonably possible decrease in designated risk component (42,401,000) (42,401,000) (37,397,000)
Decrease in current year losses due to reasonably possible decrease in designated risk component 42,401,000 42,401,000 37,397,000
Increase in accumulated losses due to reasonably possible increase in designated risk component     (37,397,000)
Decrease in accumulated losses due to reasonably possible increase in designated risk component     37,397,000
Increase in accumulated losses due to reasonably possible decrease in designated risk component (42,401,000) (42,401,000) (37,397,000)
Decrease in accumulated losses due to reasonably possible decrease in designated risk component ¥ 42,401,000 ¥ 42,401,000 ¥ 37,397,000