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Organization and nature of business - Additional information (Details)
6 Months Ended
Sep. 30, 2021
USD ($)
Sep. 27, 2021
CNY (¥)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Jul. 13, 2022
May 27, 2022
Mar. 31, 2022
UYI
Feb. 10, 2022
Feb. 09, 2022
Jan. 19, 2022
Jan. 10, 2022
Dec. 31, 2021
Nov. 23, 2021
Sep. 27, 2021
USD ($)
Sep. 27, 2021
CNY (¥)
Sep. 17, 2021
Sep. 07, 2021
Dec. 04, 2019
Organization And Nature Of Business [Line Items]                                    
Net proceeds from stock issuance | $     $ 6,000,000 $ 6,709,040                            
Business acquisition total price                           $ 11,000,000 ¥ 70,000,000      
Forest Food. | IPO                                    
Organization And Nature Of Business [Line Items]                                    
% of Ownership                           100.00% 100.00%      
Net proceeds from initial public offering $ 2,800,000 ¥ 18,200,000                                
Revenue from China                                    
Organization And Nature Of Business [Line Items]                                    
Percentage of product sold     99.90%                              
International                                    
Organization And Nature Of Business [Line Items]                                    
% of Ownership             100.00%                      
Farmmi E-Commerce                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary             77.20%                      
Yitang Mediservice                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                     100.00%              
Yiting Meditech                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                               100.00%    
Nongyuan Network. | Xinyang Wang                                    
Organization And Nature Of Business [Line Items]                                    
% of Ownership                                   100.00%
Nongyuan Network. | Xinyang Wang | Zhengyu Wang                                    
Organization And Nature Of Business [Line Items]                                    
% of Ownership                                   100.00%
Nongyuan Network. | Farmmi E-Commerce                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary             22.80%                      
Nongyuan Network. | Yitang Mediservice                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                                 95.00%  
Farmmi Agricultural | FLS Mushroom                                    
Organization And Nature Of Business [Line Items]                                    
Business acquisition total price | UYI             UYI 100                      
Farmmi Agricultural | Farmmi Supply Chain                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary               100.00%                    
Farmmi Agricultural | Farmmi Holdings                                    
Organization And Nature Of Business [Line Items]                                    
% of Ownership                       100.00%            
Farmmi Ecology | Farmmi Supply Chain                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                 100.00%                  
Farmmi Ecology | Yitang Mediservice                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                                 5.00%  
Farmmi Ecology | Farmmi Holdings                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary             30.00%                      
Farmmi Heath Development | Farmmi Medical Health                                    
Organization And Nature Of Business [Line Items]                                    
% of Ownership             100.00%                      
Farmmi Technology | Farmmi Holdings                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary             40.00%         68.30%            
Farmmi Enterprise                                    
Organization And Nature Of Business [Line Items]                                    
% of Ownership             100.00%                      
Farmmi Enterprise | Farmmi Holdings                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary             30.00%         31.70%            
Jiangxi Xiangbo | Farmmi Supply Chain                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                           100.00% 100.00%      
Yudu Yada | Farmmi Supply Chain                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                           100.00% 100.00%      
Guoning Zhonghao | Farmmi Supply Chain                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                           100.00% 100.00%      
Zhongjian Yiting | Yiting Meditech                                    
Organization And Nature Of Business [Line Items]                                    
% of Ownership                         93.75%          
Yilong Enterprise | Yitang Mediservice                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                     100.00%              
Yilong Enterprise | Yifeng Medihealth                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                   20.00%                
YF YL MediTech | Yifeng Medihealth                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                   80.00%                
YT SK Medihealth | Yifeng Medihealth                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary                   80.00%                
Farmmi Eco Agri | Subsequent Event Member | Farmmi Ecology                                    
Organization And Nature Of Business [Line Items]                                    
% Ownership in subsidiary           100.00%                        
Farmmi Canada | Subsequent Event Member                                    
Organization And Nature Of Business [Line Items]                                    
% of Ownership         100.00%                          
Guoning Zhonghao From Ningbo Guoning Zhonghao Technology Co Ltd And Jianxin Huang                                    
Organization And Nature Of Business [Line Items]                                    
Business acquisition total price                           $ 788 ¥ 5,000