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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

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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