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Summary of significant accounting policies - Transfer from (Details) - USD ($)
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
FAMI      
Variable Interest Entity [Line Items]      
WFOE that is the primary beneficiary of the VIE $ 1,668,758    
Other entities that are consolidated 319,981 $ 394,742 $ 702
WFOE that is the primary beneficiary of the VIE      
Variable Interest Entity [Line Items]      
Other entities that are consolidated 24,075,199 1,832,576 804,269
VIE and its subsidiaries      
Variable Interest Entity [Line Items]      
FAMI 45,500    
Other entities that are consolidated 5,624,880 770,216 218,232
Other entities that are consolidated      
Variable Interest Entity [Line Items]      
FAMI 124,670,237 400,960 600,000
WFOE that is the primary beneficiary of the VIE 38,204,550 1,812,810 791,603
VIE and its subsidiaries $ 1,601,406 $ 2,199,053 $ 5,620,368