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Income taxes - Unrecognized deferred tax assets (Details) - CNY (¥)
¥ in Thousands
Jun. 30, 2022
Jun. 30, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deferred tax assets ¥ 738,771 ¥ 610,937
Deductible temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deferred tax assets 107,964 127,500
Unused tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognized deferred tax assets ¥ 630,807 ¥ 483,437