Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2017	Apr. 17, 2017
Document and Entity Information
Entity Registrant Name	AMCON DISTRIBUTING CO
Entity Central Index Key	0000928465
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		678,938
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2