Alico, Inc. Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (unaudited) - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventory casualty loss and net realizable value adjustment			$ 14,688
Impairments of long-lived assets			$ 9,346
Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment loss		$ 1,855			$ 5,215
Proceeds received from property and casualty damage claims		477
Proceeds received from crop claims		$ 3,726
Crop Claims
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Insurance proceeds received				$ 8,952
Crop Claims \| Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Insurance proceeds received	$ 5,226