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Financial risk management and fair values - Exposure to currency risk (Details) - Currency risk - CNY (¥)
¥ in Thousands
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
United States Dollars      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities ¥ 404,982 ¥ 434,204 ¥ 477,710
United States Dollars | Trade and other receivables      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 141,973 61,922 54,944
United States Dollars | Cash and cash equivalents member      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 309,966 455,032 486,139
United States Dollars | Term deposits      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 35,712 344 336
United States Dollars | Trade and other payables member      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities (82,669) (83,094) (63,576)
United States Dollars | Loans and borrowings      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities     (133)
Euros      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 32,361 2,013 3,628
Euros | Trade and other receivables      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 20   5,021
Euros | Cash and cash equivalents member      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 37,492 6,677 7,516
Euros | Trade and other payables member      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities (5,151) (4,664) (8,909)
Hong Kong Dollars      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 20,281 (8,850) (6,512)
Hong Kong Dollars | Trade and other receivables      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 23,814    
Hong Kong Dollars | Cash and cash equivalents member      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 7,868 5,100 2,852
Hong Kong Dollars | Trade and other payables member      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities (11,401) (13,950) (9,364)
Renminbi      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 2,248 2,429 2,094
Renminbi | Cash and cash equivalents member      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 3,068 2,429 2,094
Renminbi | Trade and other payables member      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities (820)    
Other currencies      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 2,978 3 2
Other currencies | Trade and other receivables      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 3,889    
Other currencies | Cash and cash equivalents member      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities 19 ¥ 3 ¥ 2
Other currencies | Trade and other payables member      
Disclosure of nature and extent of risks arising from financial instruments      
Net exposure arising from recognized assets and liabilities ¥ (930)