Segment reporting (Details) - USD ($)	6 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Revenue from contract with customer	$ 4,499,612	$ 13,626,791
Outbound delivery services	1,288,398	2,407,024
Storage services	606,703	110,494
Total	6,394,713	16,144,309
Special Work Orders Logistic services [Member]
Revenue from contract with customer	588,887	205,573
Operation services [Member]
Revenue from contract with customer	210,096	684,444
Corn [Member]
Revenue from contract with customer	0	782,946
Shiitake [Member]
Revenue from contract with customer	1,854,057	6,668,963
Mu Er [Member]
Revenue from contract with customer	1,846,572	5,255,756
Other products [Member]
Revenue from contract with customer	$ 0	$ 29,109

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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