Annual report pursuant to Section 13 and 15(d)

Cover Page

Cover Page - USD ($)
12 Months Ended
Sep. 30, 2020
Dec. 04, 2020
Mar. 31, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2020    
Document Transition Report false    
Entity File Number 0-261    
Entity Registrant Name ALICO, INC.    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000003545    
Current Fiscal Year End Date --09-30    
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    
Title of 12(b) Security Common Stock    
Trading Symbol ALCO    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Icfr Auditor Attestation Flag true    
Entity Filer Category Accelerated Filer    
Entity Smaller Reporting Company false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 162,656,988
Entity Common Stock, Shares Outstanding (in shares)   7,506,160  
Documents Incorporated by Reference Portions of the Proxy Statement of Registrant for the 2021 Annual Meeting of Shareholders (to be filed with the SEC under Regulation 14A within 120 days after the end of the Registrant's fiscal year), are incorporated by reference in Part III of this report.