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Trade and other payables - Narrative (Details) - BER Technology - CNY (¥)
6 Months Ended 12 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2024
Trade and other payables        
Remaining equity interest (as a percent) 20.00% 20.00%    
Initial redemption liability       ¥ 44,105,000,000
Equity interests of BER Technology     ¥ 15,000,000  
Put option        
Trade and other payables        
Initial redemption liability       183,569,000
Remeasurement amount of redemption liability       ¥ 232,951,000