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Description of Business and Basis of Presentation (Details) a in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2019 USD ($) | Oct. 01, 2018 USD ($) | Sep. 30, 2019 USD ($) a classification | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) a classification segment | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business segments | segment |  |  |  |  |  |  |  |  |  |  | 2 |  |
Net loss attributable to subsidiary |  |  | $ (232,000) | $ (28,000) | $ (87,000) | $ (36,000) | $ (218,000) | $ (8,000) | $ (16,000) | $ (8,000) | $ (383,000) | $ (250,000) | $ (45,000)
Net income (loss) attributable to Alico Inc. common stockholders |  |  | $ 16,509,000 | $ 16,244,000 | $ 7,547,000 | $ (2,467,000) | $ 718,000 | $ 9,100,000 | $ (5,514,000) | $ 8,746,000 | 37,833,000 | 13,050,000 | (9,451,000)
Citree |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to subsidiary |  |  |  |  |  |  |  |  |  |  | 781,783 | 511,854 | 91,432
Net income (loss) attributable to Alico Inc. common stockholders |  |  |  |  |  |  |  |  |  |  | $ 398,709 | $ 261,046 | $ 46,630
Land |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of land owned (in acres) | a |  |  | 111 |  |  |  |  |  |  |  | 111 |  |
Number of primary classifications | classification |  |  | 2 |  |  |  |  |  |  |  | 2 |  |
Mineral Rights |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of land owned (in acres) | a |  |  | 90 |  |  |  |  |  |  |  | 90 |  |
ASU 2016-02 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use asset | $ 511,000 |  |  |  |  |  |  |  |  |  |  |  |
Lease liability | 511,000 |  |  |  |  |  |  |  |  |  |  |  |
Impairment to right of use asset | $ 87,000 |  |  |  |  |  |  |  |  |  |  |  |
ASC 610-20 | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net adjustment to retained earnings |  | $ 10,897,000 |  |  |  |  |  |  |  |  |  |  |

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