Document and Entity Information
 3 Months Ended
Dec. 31, 2013
Jan. 20, 2014
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, 2013  
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   611,432
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q1