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Equity - Additional informations (Details) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | May 31, 2021 USD ($) $ / shares shares | Apr. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) employee $ / shares shares | Sep. 30, 2020 USD ($) shares | Sep. 20, 2021 $ / shares | Jul. 22, 2021 $ / shares shares | Jul. 21, 2021 $ / shares shares | May 04, 2021 $ / shares | Mar. 29, 2021 $ / shares | Sep. 12, 2020 $ / shares shares | Sep. 11, 2020 $ / shares shares
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock value | $ 557,781 |  |  | $ 557,781 | $ 20,518 |  |  |  |  |  |  |
Common stock, shares authorized | shares | 600,000,000 |  |  | 600,000,000 |  |  | 600,000,000 | 200,000,000 |  |  | 200,000,000 | 20,000,000
Ordinary shares, par value (in dollars per share) | $ / shares | $ 0.001 |  |  | $ 0.001 |  |  | $ 0.001 | $ 0.001 |  |  | $ 0.001 | $ 0.001
Number of shares issued (in shares) | shares |  | 93,111,717 | 161,000,000 | 7,439,886 |  |  |  |  |  |  |  |
Price per share | $ / shares | $ 1.15 | $ 0.22 | $ 0.30 | $ 1.15 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 48,300,000 | $ 8,555,869 |  |  |  |  |  |  |  |
Offering costs | $ 6,811,246 | $ 4,215,831 | $ 808,967 |  |  |  |  |  |  |  |  |
Number of warrants issued | shares |  | 275,150,000 |  | 275,150,000 | 692,886 |  |  |  |  |  |  |
Exercise price per share without expiry date | $ / shares |  | $ 0.2199 |  |  |  |  |  |  |  |  |  |
Exercise price of warrant | $ / shares |  | $ 0.0001 |  |  |  | $ 0.22 |  |  | $ 0.30 | $ 1.15 |  |
Net proceeds from the issuance of ordinary share |  |  |  | $ 126,010,538 |  |  |  |  |  |  |  |
Proceeds from issuance of warrants | $ 19,050 | $ 81,009,763 |  |  |  |  |  |  |  |  |  |
Number of shares per warrant | shares | 1 |  |  | 1 |  |  |  |  |  |  |  |
Number of warrants Exercised | shares |  |  |  | 275,150,000 |  |  |  |  |  |  |  |
Number of investor warrant issued to purchase | shares | 275,114,477 |  |  | 275,114,477 |  |  |  |  |  |  |  |
Proceeds from warrants exercised |  |  |  | $ 19,050 |  |  |  |  |  |  |  |
Shares issued under Share incentive plan | shares |  |  |  | 1,168,000 |  |  |  |  |  |  |  |
Percentage of shares issued under share incentive plan |  |  |  | 10.00% |  |  |  |  |  |  |  |
Vesting percentage |  |  |  | 20.00% |  |  |  |  |  |  |  |
Vesting period |  |  |  | 5 years |  |  |  |  |  |  |  |
Share-based compensation expenses |  |  |  | $ 1,260,674 |  |  |  |  |  |  |  |
Statutory reserve | $ 973,555 |  |  | $ 973,555 | $ 972,092 |  |  |  |  |  |  |
Shares Vested under Share incentive plan | shares |  |  |  | 596,600 |  |  |  |  |  |  |  |
Number of employees exercised share incentive plan | employee |  |  |  | 4 |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 805,410 |  |  |  |  |  |  |  |
Remaining ordinary shares available Share incentive plan | shares | 571,400 |  |  | 571,400 |  |  |  |  |  |  |  |
Statutory surplus reserve |  |  |  | 10.00% |  |  |  |  |  |  |  |
Minimum percentage of statutory reserve transferable |  |  |  | 50.00% |  |  |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants | $ 455,264 |  |  | $ 455,264 |  |  |  |  |  |  |  |
Investor Warrants and Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrant | $ / shares |  |  |  |  |  | $ 0.22 |  |  | $ 0.30 | $ 1.15 |  |
Farmmi Supply Chain |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest | 3.85% |  |  | 3.85% | 3.85% |  |  |  |  |  |  |
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expenses |  |  |  | $ 1,260,077 |  |  |  |  |  |  |  |

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