Document and Entity Information	3 Months Ended
	Dec. 31, 2011	Jan. 16, 2012
Document and Entity Information
Entity Registrant Name	AMCON DISTRIBUTING CO
Entity Central Index Key	0000928465
Document Type	10-Q
Document Period End Date	Dec. 31, 2011
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		625,271
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1