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Financial risk management and fair values - Group's exposure to credit risk and ECLs for trade receivables (Details) - CNY (¥)
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Trade receivables | Minimum      
Disclosure of provision matrix [line items]      
Expected loss rate, basis period 2 years    
Trade receivables | Maximum      
Disclosure of provision matrix [line items]      
Expected loss rate, basis period 3 years    
Trade receivables | Gross carrying amount before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ 322,046,000 ¥ 356,796,000  
Trade receivables | Loss allowance before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets (31,365,000) (41,795,000)  
Trade receivables | Gross carrying amount, Additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets 53,752,000 18,032,000 ¥ 18,032,000
Trade receivables | Additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets (53,752,000) (18,032,000)  
Trade receivables | Gross carrying amount      
Disclosure of provision matrix [line items]      
Financial assets 375,798,000 374,828,000  
Trade receivables | Loss allowance      
Disclosure of provision matrix [line items]      
Financial assets ¥ (85,117,000) ¥ (59,827,000) ¥ (43,183,000)
Current (not past due) | Trade receivables      
Disclosure of provision matrix [line items]      
Expected loss rate (as a percent) 2.00% 2.00%  
Current (not past due) | Trade receivables | Gross carrying amount before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ 186,151,000 ¥ 236,210,000  
Current (not past due) | Trade receivables | Loss allowance before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ (3,967,000) ¥ (4,827,000)  
Less than 90 days past due | Trade receivables      
Disclosure of provision matrix [line items]      
Expected loss rate (as a percent) 8.00% 5.00%  
Less than 90 days past due | Trade receivables | Gross carrying amount before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ 96,508,000 ¥ 38,141,000  
Less than 90 days past due | Trade receivables | Loss allowance before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ (7,458,000) ¥ (1,907,000)  
91 - 270 days past due | Trade receivables      
Disclosure of provision matrix [line items]      
Expected loss rate (as a percent) 23.00% 12.00%  
91 - 270 days past due | Trade receivables | Gross carrying amount before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ 10,554,000 ¥ 27,838,000  
91 - 270 days past due | Trade receivables | Loss allowance before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ (2,446,000) ¥ (3,341,000)  
271 - 450 days past due | Trade receivables      
Disclosure of provision matrix [line items]      
Expected loss rate (as a percent) 38.00% 26.00%  
271 - 450 days past due | Trade receivables | Gross carrying amount before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ 18,224,000 ¥ 25,055,000  
271 - 450 days past due | Trade receivables | Loss allowance before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ (6,991,000) ¥ (6,514,000)  
451 - 810 days past due      
Disclosure of provision matrix [line items]      
Expected loss rate (as a percent) 75.00%    
451 - 810 days past due | Trade receivables      
Disclosure of provision matrix [line items]      
Expected loss rate (as a percent)   58.00%  
451 - 810 days past due | Trade receivables | Gross carrying amount before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ 416,000 ¥ 10,347,000  
451 - 810 days past due | Trade receivables | Loss allowance before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ (310,000) ¥ (6,001,000)  
More than 810 days past due      
Disclosure of provision matrix [line items]      
Expected loss rate (as a percent) 100.00%    
More than 810 days past due | Trade receivables      
Disclosure of provision matrix [line items]      
Expected loss rate (as a percent)   100.00%  
More than 810 days past due | Trade receivables | Gross carrying amount before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ 10,193,000 ¥ 19,205,000  
More than 810 days past due | Trade receivables | Loss allowance before adjustment for additional loss allowance due to specific consideration on certain distributors      
Disclosure of provision matrix [line items]      
Financial assets ¥ (10,193,000) ¥ (19,205,000)