SUPPLEMENTAL PRO FORMA INFORMATION - Equity method investment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
EQUITY METHOD INVESTMENT
Total external revenue	$ 550,584,152	$ 438,313,030	$ 1,365,043,621	$ 1,221,571,294
Gross profit	33,676,612	25,541,706	87,286,196	71,976,471
Net income before income taxes	8,663,227	4,012,917	15,898,304	10,710,604
Net income attributable to AMCON, net of tax	5,982,831	3,691,210	11,990,068	9,197,728
Team Sledd
EQUITY METHOD INVESTMENT
Total external revenue	64,123,105	179,676,748	393,606,372	502,704,216
Gross profit	3,721,966	9,711,966	21,759,753	25,279,274
Net income before income taxes	828,775	2,034,258	4,498,190	3,979,078
Net income attributable to AMCON, net of tax	$ 307,973	$ 754,293	$ 1,670,133	$ 1,403,124