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Comparative figures - Additional Information (Detail)
¥ in Millions
12 Months Ended
Dec. 31, 2021
CNY (¥)
Trade and Other Receivables and Trade and Other Payables [Member]  
Disclosure of reclassifications or changes in presentation [line items]  
Amount of reclassifications or changes in presentation ¥ 195.4
Net Current Assets and Net Assets [Member]  
Disclosure of reclassifications or changes in presentation [line items]  
Amount of reclassifications or changes in presentation ¥ 0.0