| Cover Page | May 05, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 5, 2021 |
| Entity Registrant Name | ALICO, INC. |
| Entity Central Index Key | 0000003545 |
| Entity Emerging Growth Company | false |
| Entity File Number | 0-261 |
| Entity Incorporation, State or Country Code | FL |
| Entity Tax Identification Number | 59-0906081 |
| Entity Address, Address Line One | 10070 Daniels Interstate Court |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Fort Myers |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33913 |
| City Area Code | 239 |
| Local Phone Number | 226-2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | ALCO |
| Security Exchange Name | NASDAQ |
