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v3.21.2

Subsequent Events - Narrative (Details) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Dec. 03, 2021 USD ($) a | Dec. 02, 2021 $ / shares | Nov. 05, 2021 $ / shares shares | Oct. 15, 2021 $ / shares shares | Nov. 10, 2020 $ / shares shares | Sep. 10, 2020 USD ($) | Nov. 30, 2017 $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share |  |  |  |  |  |  |  | $ 1.36 | $ 0.36 | $ 0.24
Gain on sale of investment in real estate | $ |  |  |  |  |  |  |  | $ 35,898,000 | $ 30,424,000 | $ 13,166,000
Alico Ranch |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on sale of investment in real estate | $ |  |  |  |  |  | $ 28,500,000 |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Number of restricted shares awarded | shares |  |  |  |  | 5,885 |  | 5,000 | 5,885 |  |
Weighted average fair value (in dollars per share) |  |  |  |  | $ 31.20 |  | $ 31.95 | $ 31.20 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share |  | $ 0.50 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Discontinued Operations, Disposed of by Sale | Alico Ranch |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Acres of land sold | a | 1,638 |  |  |  |  |  |  |  |  |
Gain on sale of investment in real estate | $ | $ 5,675,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | 2015 Option Grants |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average fair value (in dollars per share) |  |  | $ 35.77 | $ 35.77 |  |  |  |  |  |
Vesting date |  |  | Jan. 01, 2023 | Jan. 01, 2022 |  |  |  |  |  |
Subsequent Event [Member] | Restricted Stock | 2015 Option Grants |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Number of restricted shares awarded | shares |  |  | 2,224,000 | 2,500,000 |  |  |  |  |  |

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