| Cover | Jun. 30, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 30, 2022 |
| Entity File Number | 1-15589 |
| Entity Registrant Name | AMCON DISTRIBUTING COMPANY |
| Entity Central Index Key | 0000928465 |
| Entity Tax Identification Number | 47-0702918 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 7405 Irvington Road |
| Entity Address, City or Town | Omaha |
| Entity Address, State or Province | NE |
| Entity Address, Postal Zip Code | 68122 |
| City Area Code | 402 |
| Local Phone Number | 331-3727 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | DIT |
| Security Exchange Name | NYSEAMER |
| Entity Emerging Growth Company | false |
