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Financial risk management and fair values - Exposure to currency risk (Details) - Currency risk - CNY (¥)
¥ in Thousands
Jun. 30, 2022
Jun. 30, 2021
United States Dollars    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities ¥ 477,710 ¥ 391,613
United States Dollars | Trade and other receivables    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities 54,944 20,423
United States Dollars | Cash and cash equivalents member    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities 486,139 402,563
United States Dollars | Term deposits    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities 336  
United States Dollars | Trade and other payables member    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities (63,576) (24,760)
United States Dollars | Loans and borrowings    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities (133) (6,613)
Euros    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities 3,628 15,401
Euros | Trade and other receivables    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities 5,021  
Euros | Cash and cash equivalents member    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities 7,516 19,927
Euros | Trade and other payables member    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities (8,909) (4,526)
Hong Kong Dollars    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities (6,512) (21,240)
Hong Kong Dollars | Cash and cash equivalents member    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities 2,852 2,728
Hong Kong Dollars | Trade and other payables member    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities (9,364) (23,968)
Renminbi    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities 2,094 601,491
Renminbi | Cash and cash equivalents member    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities 2,094 601,491
Other currencies    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities 2 3,107
Other currencies | Trade and other receivables    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities   1,818
Other currencies | Cash and cash equivalents member    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities ¥ 2 1,306
Other currencies | Trade and other payables member    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Net exposure arising from recognized assets and liabilities   ¥ (17)