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Property and Equipment, Net - Narrative (Details) |  |  |  |  |  |  |  | 5 Months Ended | 12 Months Ended | 52 Months Ended |
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Sep. 27, 2019 USD ($) a | Sep. 26, 2019 USD ($) | Sep. 28, 2018 USD ($) | Mar. 30, 2018 USD ($) | Mar. 15, 2018 USD ($) | Feb. 02, 2017 USD ($) a | Nov. 21, 2014 USD ($) a | Sep. 30, 2019 USD ($) a property | Sep. 30, 2019 USD ($) a property | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 11, 2019 USD ($) | Sep. 29, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of investment in real estate |  |  |  |  |  |  |  |  | $ 13,166,000 | $ 11,041,000 | $ 2,181,000 |  |
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for discontinued operation |  |  |  |  |  |  |  | $ 47,000 | 47,000 |  |  |  |
Impairment |  |  |  |  |  |  |  |  | $ 244,000 | 2,084,000 |  |  |
Citrus Blocks |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acres of land purchased | a |  |  |  |  |  |  |  | 203 | 203 |  |  |  |
Gain on sale of investment in real estate |  |  |  |  |  |  |  | $ 100,000 | $ 1,950,000 |  |  |  |
Amount of collateral and release substituted |  |  |  |  |  |  |  | $ 1,800,000 | $ 1,800,000 |  |  |  |
Number of additional purchases | property |  |  |  |  |  |  |  | 2 | 2 |  |  |  |
West Ranch | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acres of land sold | a | 5,500 |  |  |  |  |  |  |  |  |  |  |  |
Consideration for discontinued operation | $ 14,775,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of discontinued operation | 13,033,000 |  |  |  |  |  |  |  |  |  |  |  |
Lease rate | $ 80,000 | $ 98,750 |  |  |  |  |  |  |  |  |  |  |
Island Pond | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for discontinued operation |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,900,000
Impairment |  |  |  |  |  |  |  |  |  | 1,032,000 |  |  |
Island Pond | Discontinued Operations, Disposed of by Sale | Restricted Cash |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for discontinued operation |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000
East Ranch | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for discontinued operation |  |  | $ 1,920,000 |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of discontinued operation |  |  | $ 1,759,000 |  |  |  |  |  |  |  |  |  |
Winterhaven | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for discontinued operation |  |  |  | $ 225,000 |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of discontinued operation |  |  |  | $ (50,000) |  |  |  |  |  |  |  |  |
Ranch One Grove | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration for discontinued operation |  |  |  |  | $ 586,000 |  |  |  |  |  |  |  |
Gain (loss) on disposal of discontinued operation |  |  |  |  | $ (87,000) |  |  |  |  |  |  |  |
Hendry County Florida |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of discontinued operation |  |  |  |  |  |  |  |  |  |  |  | $ (6,518,000) |
Hendry County Florida | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of investment in real estate |  |  |  |  |  | $ 1,371,000 | $ 13,613,000 |  |  |  |  |  |
Acres of land sold | a |  |  |  |  |  | 49 | 36,000 |  |  |  |  |  |
Consideration for discontinued operation |  |  |  |  |  | $ 2,200,000 | $ 97,900,000 |  |  |  |  |  |
Citrus Trees | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  |  |  | $ 1,052,000 |  |  |

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