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Property and Equipment, Net - Narrative (Details) |  |  |  |  |  |  | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2020 USD ($) a | May 04, 2020 USD ($) a | Mar. 27, 2020 USD ($) | Sep. 27, 2019 USD ($) a | Sep. 26, 2019 USD ($) | Oct. 30, 2018 USD ($) | Jun. 30, 2020 USD ($) property | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) a property | Jun. 30, 2020 USD ($) property | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) a property
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of investment in real estate |  |  |  |  |  |  | $ 154,000 | $ 114,000 |  | $ 3,017,000 | $ 137,000 |
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration for discontinued operation |  |  | $ 2,952,000 |  |  | $ 206,000 |  |  | $ 47,000 |  |  | $ 47,000
Gain on disposal of discontinued operation |  |  | $ 2,838,000 |  |  | $ 12,000 |  |  |  |  |  |
Citrus Blocks |  |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acres of land purchased | a |  | 334 |  |  |  |  |  |  | 203 |  |  | 203
Gain on sale of investment in real estate |  | $ 2,850,000 |  |  |  |  |  |  | $ 100,000 | $ 70,000 |  | $ 1,950,000
Amount of collateral and release substituted |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  | $ 1,800,000
Number of additional purchases | property |  |  |  |  |  |  | 2 |  | 2 | 2 |  | 2
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 |  |  |  |  |  |  |  |
Gain on disposal of discontinued operation | $ 89,000 |  |  | 13,033,000 |  |  |  |  |  |  |  |
Lease rate |  |  |  | $ 80,000 | $ 98,750 |  |  |  |  |  |  |
Citrus trees |  |  |  |  |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  | $ 723,000 |  | $ 244,000

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