EQUITY METHOD INVESTMENT - Equity investee's summarized financial data (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
EQUITY METHOD INVESTMENT
Total external revenue	$ 391,888,192	$ 378,513,490	$ 814,459,469	$ 783,258,263
Gross profit	26,676,922	22,972,786	53,609,584	46,434,765
Net income before income taxes	3,759,387	2,944,416	7,235,077	6,697,687
Net income attributable to AMCON, net of tax	591,795	313,492	1,362,161	648,831
Team Sledd | Equity method investment
EQUITY METHOD INVESTMENT
Total external revenue	148,066,173	158,459,384	329,483,268	323,027,468
Gross profit	8,219,808	7,719,918	18,037,786	15,567,308
Net income before income taxes	1,594,579	941,027	3,669,415	1,944,820
Net income attributable to AMCON, net of tax	$ 591,795	$ 313,492	$ 1,362,161	$ 648,831