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Income taxes - Tax losses carried forward (Details) - CNY (¥)
¥ in Thousands
Jun. 30, 2022
Jun. 30, 2021
Income taxes    
Tax losses for which no deferred tax asset was recognized, subject to expiration ¥ 278,215 ¥ 147,928
Tax losses for which no deferred tax asset was recognized, not subject to expiration ¥ 352,592 ¥ 335,509