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Related Party Transactions - Silver Nip Citrus Merger Agreement (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Feb. 27, 2015 | Nov. 19, 2013
Related Party Transaction [Line Items] |  |  |  |  |  |
Common stock, par value per share (in dollars per share) | $ 1.00 | $ 1.00 | $ 1 | $ 1.00 |  |
Closing price of common stock (in dollars per share) |  |  |  |  | $ 45.67 |
Silver Nip Citrus | General and Administrative Expense |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Professional and legal costs |  |  | $ 85 | $ 309 |  |
Merger Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Shares of common stock issued (in shares) | 923,257 | 115,782 | 148,705 |  |  |
Outstanding net indebtedness | $ 40,278 |  |  |  |  |
Other liabilities | 8,446 |  |  |  |  |
Book value of assets | 65,739 |  |  |  |  |
Total net assets | $ 17,015 |  |  |  |  |
Alico Inc |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  | 51.00%
Alico Inc | Silver Nip Citrus |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) | 74.89% |  |  |  |  |
Mr. Clay Wilson | Silver Nip Citrus |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) | 5.00% |  |  |  |  |
Entity Controlled by Mr. Clay Wilson | Silver Nip Citrus |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) | 20.11% |  |  |  |  |

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