Quarterly report pursuant to Section 13 or 15(d)

Cover Page

Cover Page - shares
9 Months Ended
Jun. 30, 2021
Aug. 03, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2021  
Document Transition Report false  
Entity File Number 0-261  
Entity Registrant Name ALICO, INC.  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Smaller Reporting Company true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   7,526,004
Amendment Flag false  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0000003545  
Current Fiscal Year End Date --09-30