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Financial risk management and fair values - Movement in loss allowance account in respect of trade receivables (Details) - CNY (¥)
 6 Months Ended 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Trade receivables      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments      
Written off during the period ¥ 10,476,000    
Decrease Through Collection Of Receivables 7,106,000    
Trade receivables | Loss allowance      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments      
Balance at the beginning of period (88,764,000) ¥ (85,117,000) ¥ (59,827,000)
Written off during the period 10,476,000    
Credit loss recognized during the year (2,080,000) (908,000) (28,924,000)
Exchange adjustment 1,934,000 (2,739,000) 3,634,000
Balance at the end of period (78,434,000) (88,764,000) (85,117,000)
Increase (decrease) through origination of new financial assets (8,332,000)    
Increase through increase in days past due days     (5,551,000)
Decrease through decrease in days past due days   20,300,000 14,703,000
Increase due to deterioration of financial status of certain overseas distributor   21,367,000 35,720,000
Other receivables | Loss allowance      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments      
Credit loss recognized during the year ¥ 0 ¥ 0 ¥ 0