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Income taxes - Tax losses carried forward (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Income taxes      
Expire ¥ 432,759 ¥ 361,627 ¥ 278,215
Never expire ¥ 341,825 ¥ 389,629 ¥ 352,592