ACQUISITIONS - Summarized financial data (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Total external revenue	$ 2,539,994,999	$ 2,010,798,385
Gross profit	170,844,897	127,719,566
Net income before income taxes	17,302,393	21,475,504
Net income attributable to AMCON, net of tax	$ 11,596,393	16,672,257
Team Sledd
Business Acquisition [Line Items]
Total external revenue		393,606,372
Gross profit		21,759,753
Net income before income taxes		4,498,190
Net income attributable to AMCON, net of tax		$ 1,670,133