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Subsequent events - (Details)
¥ in Millions, $ in Millions
Nov. 05, 2021
CNY (¥)
Nov. 05, 2021
USD ($)
Sep. 30, 2021
CNY (¥)
Sep. 30, 2021
USD ($)
Sep. 27, 2021
CNY (¥)
Sep. 27, 2021
USD ($)
Jiangxi Xiangbai Agriculture And Forestry Development Company Ltd            
Subsequent Event [Line Items]            
Total consideration transferred         ¥ 70.0 $ 10.9
Prepayment of consideration     ¥ 10.0 $ 1.6 ¥ 60.0 $ 9.3
Subsequent Event Member | Shanghai Jiaoda Onlly Co., Ltd            
Subsequent Event [Line Items]            
Percentage of voting interest acquired 15.97% 15.97%        
Total consideration transferred ¥ 509.6 $ 79.8