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Trade and other payables - Narrative (Details) - BER Technology - CNY (¥)
 6 Months Ended 12 Months Ended
Dec. 30, 2022
Dec. 31, 2022
Dec. 31, 2022
Trade and other payables      
Remaining equity interest (as a percent) 20.00% 20.00%  
Initial redemption liability   ¥ 44,105,000 ¥ 44,105,000
Remeasurement amount of redemption liability   15,000,000 ¥ 15,000,000
Put option      
Trade and other payables      
Remaining equity interest (as a percent)     48.33%
Initial redemption liability   183,569,000 ¥ 183,569,000
Remeasurement amount of redemption liability   ¥ 228,937,000 ¥ 228,937,000