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Inventory - Results of Discounted Cash Flow Analysis (Details) (Details) $ in Thousands | 3 Months Ended
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Dec. 31, 2018 USD ($) lot Community | Dec. 31, 2017 USD ($)
Real Estate, Write-down or Reserve [Line Items] |  |
Number of Communities Impaired | Community | 1 |
Number of Lots Impaired | lot | 15 |
Impairment Charge | $ 1,007 | $ 500
Estimated Fair Value of Impaired Inventory at time of Impairment | $ 1,605 |
Continuing Operations | Southeast Segment |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Number of Communities Impaired | Community | 1 |
Number of Lots Impaired | lot | 15 |
Impairment Charge | $ 858 |
Estimated Fair Value of Impaired Inventory at time of Impairment | $ 1,367 |
Corporate and unallocated | Continuing Operations |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Number of Communities Impaired | Community | 0 |
Number of Lots Impaired | lot | 0 |
Impairment Charge | $ 149 |
Estimated Fair Value of Impaired Inventory at time of Impairment | $ 238 |

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