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Property and Equipment, Net - Narrative (Details) |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 30, 2020 USD ($) | Jun. 01, 2020 USD ($) a | May 04, 2020 USD ($) a | Sep. 27, 2019 USD ($) a | Sep. 26, 2019 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) a | Sep. 30, 2019 USD ($) | Oct. 10, 2020 a
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  | $ 0 | $ 0 |  |
Gain on sale of investment in real estate |  |  |  |  |  | 35,898,000 | $ 30,424,000 | $ 13,166,000 |
Citrus Blocks |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Long Lived Assets Acres Of Land Purchased | a |  |  | 334 |  |  |  |  |  | 3,280
Gain on sale of investment in real estate | $ 18,230,000 |  | $ 2,850,000 |  |  |  |  |  |
West Ranch | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Acres of land sold | a |  | 30 |  | 5,500 |  |  |  |  |
Consideration for discontinued operation |  | $ 122,000 |  | $ 14,775,000 |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  | $ 83,000 |  | 13,033,000 |  |  |  |  |
Lease rate |  |  |  | $ 80,000 | $ 98,750 |  |  |  |
State Of Florida | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Acres of land sold | a |  |  |  |  |  |  | 10,700 |  |
Citrus trees |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  | $ 0 | $ 598,000,000 |  |

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