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Income taxes - Unrecognized deferred tax assets (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Income taxes      
Unrecognized deferred tax assets ¥ 829,000 ¥ 800,631 ¥ 738,771
Deductible temporary differences      
Income taxes      
Unrecognized deferred tax assets 54,416 49,375 107,964
Cumulative tax losses      
Income taxes      
Unrecognized deferred tax assets ¥ 774,584 ¥ 751,256 ¥ 630,807