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Segment reporting - Revenue by major product categories (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Segment reporting      
Total lease cost $ 39,289,951 $ 28,363,963 $ 28,643,293
Shiitake      
Segment reporting      
Total lease cost 20,494,362 15,098,877 15,959,742
Mu Er      
Segment reporting      
Total lease cost 16,524,723 12,082,365 11,398,566
Other edible fungi and other agricultural products      
Segment reporting      
Total lease cost $ 2,270,866 $ 1,182,721 $ 1,284,985