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Assets Held for Sale - Narrative (Details) |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 03, 2021 USD ($) a | Apr. 15, 2021 USD ($) a | Dec. 18, 2020 USD ($) a | Sep. 10, 2020 USD ($) a | Mar. 27, 2020 USD ($) | Sep. 30, 2021 USD ($) a | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2013 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gains on sale of real estate, property and equipment and assets held for sale |  |  |  |  |  | $ 35,898,000 | $ 30,424,000 | $ 13,166,000 |
Asset Impairment Charges |  |  |  |  |  | 0 | 0 |  |
Impairment of long-lived assets |  |  |  |  |  |  | $ 598,000 | $ 152,000 |
Alico Ranch |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Long Lived Assets Acres Of Land Purchased | a |  |  |  | 10,700 |  |  |  |  |
Gains on sale of real estate, property and equipment and assets held for sale |  |  |  | $ 28,500,000 |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  | $ 27,470,000 |  |  |  |  |
Alico Ranch | Employee |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gains on sale of real estate, property and equipment and assets held for sale |  |  |  |  |  | $ 392,000 |  |  |
Alico Ranch | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Long Lived Assets Acres Of Land Purchased | a | 11,700 | 5,734 | 600 |  |  | 1,742 |  |  |
Gains on sale of real estate, property and equipment and assets held for sale | $ 12,219,000 | $ 14,445,000 | $ 2,630,000 |  |  | $ 8,286,000 |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax | $ 11,351,000 | $ 13,921,000 | $ 2,550,000 |  |  | $ 7,697,000 |  |  | $ 1,800,000
Acres Of Land Sold | a |  |  |  |  |  | 97 |  |  |
East Ranch | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  |  | $ 2,748,000 |  |  |  |
Consideration for discontinued operation |  |  |  |  | $ 2,980,000 |  |  |  |

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