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Organization and principal activities (Details)
¥ in Millions
6 Months Ended 12 Months Ended
Nov. 26, 2019
CNY (¥)
shares
Sep. 30, 2021
segment
Mar. 31, 2022
segment
Nov. 26, 2019
$ / shares
Organization and principal activities        
Number of operating segment | segment   4 7  
Number of reportable segment | segment   4 7  
Global offering        
Organization and principal activities        
Shares issued (in shares) | shares 575,000,000      
Price of share issued (in HKD per share) | $ / shares       $ 176
Net proceeds raised by the Company from the global offering | ¥ ¥ 90,442      
Over-allotment option        
Organization and principal activities        
Shares issued (in shares) | shares 75,000,000