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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 ($)
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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 |  |  |  |

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