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Description of Business and Basis of Presentation - Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Total Revenues | $ 11,005 | $ 14,779
Alico Citrus |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 10,175 | 13,897
Water Resources and Other Operations |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 830 | 882
Early and Mid-Season | Alico Citrus |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 9,066 | 11,645
Fresh Fruit | Alico Citrus |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 735 | 1,906
Other | Alico Citrus |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 374 | 346
Other | Water Resources and Other Operations |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 167 | 148
Land and Other Leasing | Water Resources and Other Operations |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | $ 663 | $ 734

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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