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Loans - Additional information (Details) ¥ in Thousands |  |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 05, 2021 USD ($) | Apr. 30, 2021 USD ($) | Nov. 12, 2020 USD ($) | Nov. 12, 2020 CNY (¥) | Nov. 13, 2019 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2021 CNY (¥) | Aug. 05, 2021 CNY (¥) | Apr. 30, 2021 CNY (¥) | Nov. 12, 2020 CNY (¥) | Nov. 13, 2019 CNY (¥)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term bank loans |  |  |  |  |  | $ 2,172,766 | $ 588,000 |  |  |  |  |  |
Repayment for loan |  |  |  |  |  | 2,147,199 | 938,071 | $ 87,800 |  |  |  |  |
Loan secured by an office property and land use right |  |  |  |  |  | 1,000,000 |  |  | ¥ 6,850 |  |  |  |
Interest expenses |  |  |  |  |  | 53,009 | 166,089 | $ 0 |  |  |  |  |
Zhejiang Mintai Commercial Bank (Hangzhou Branch) |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term bank loans |  |  |  |  |  | 2,172,766 |  |  |  |  |  |  |
Zhejiang Mintai Commercial Bank (Hangzhou Branch) | Nongyuan Network. |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term bank loans | $ 2,170,000 |  |  |  |  |  |  |  |  | ¥ 14,000 |  |  |
Maturity date | Jul. 05, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate | 7.056% |  |  |  |  |  |  |  |  | 7.056% |  |  |
Percentage of ownership interest | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Hangzhou United Rural Commercial Bank Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term bank loans |  |  | $ 499,800 |  |  |  | $ 588,000 |  |  |  |  | ¥ 3,400 |
Loan repaid |  |  | $ 88,200 | ¥ 600 |  |  |  |  |  |  |  |  |
Maturity date |  |  | May 10, 2021 | May 10, 2021 |  |  |  |  |  |  |  |  |
Effective interest rate |  |  | 6.09% |  |  |  |  |  |  |  |  | 6.09% |
Hangzhou United Rural Commercial Bank Co., Ltd. | Suyuan Agriculture |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term bank loans |  |  |  |  | $ 590,000 |  |  |  |  |  |  |  | ¥ 4,000
Maturity date |  |  |  |  | Nov. 12, 2020 |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 6.09% |  |  |  |  |  |  |  | 6.09%
China Resources Shenzhen Investment Trust Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan |  |  |  |  |  | 142,264 |  |  |  |  |  |  |
China Resources Shenzhen Investment Trust Co., Ltd. | Farmmi Food |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term loan |  | $ 155,198 |  |  |  | $ 142,264 |  |  | ¥ 900 |  | ¥ 1,000 |  |
Maturity date |  | Apr. 28, 2023 |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 10.80% |  |  |  |  |  |  |  |  | 10.80% |  |

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