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Financial risk management and fair values - Fair Value Measurements - Group's financial assets that are measured at fair value (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Transfers from level 1 to level 2, assets ¥ 0 ¥ 0
Transfers from level 2 to level 1, assets 0 0
Transfers into level 3, assets 0 0
Transfers out of level 3, assets 0 0
Transfers from level 1 to level 2, liabilities 0 0
Transfers from level 2 to level 1, liabilities 0 0
Transfers into level 3, liabilities 0 0
Transfers out of level 3, liabilities 0 0
Recurring | Other investments member    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 210,523 102,968
Recurring | Level 1 | Other investments member    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 1,874  
Recurring | Level 2 | Other investments member    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets ¥ 208,649 ¥ 102,968