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Inventory - Results of Discounted Cash Flow Analysis (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 USD ($) lot Community | Sep. 30, 2017 USD ($) lot Community | Sep. 30, 2016 USD ($) lot Community
Real Estate, Write-down or Reserve [Line Items] |  |  |
Number of Communities Impaired | Community | 1 | 1 | 3
Number of Lots Impaired | lot | 25 | 46 | 291
Impairment Charge | $ 1,000 | $ 1,693 | $ 13,724
Estimated Fair Value of Impaired Inventory at time of Impairment | $ 1,312 | $ 3,791 | $ 34,418
Corporate and unallocated | Continuing Operations |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Number of Communities Impaired | Community | 0 | 0 | 0
Number of Lots Impaired | lot | 0 | 0 | 0
Impairment Charge | $ 212 | $ 68 | $ 1,101
Estimated Fair Value of Impaired Inventory at time of Impairment | $ 0 | $ 0 | $ 0
Southeast | Continuing Operations |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Number of Communities Impaired | Community | 1 |  |
Number of Lots Impaired | lot | 25 |  |
Impairment Charge | $ 793 |  |
Estimated Fair Value of Impaired Inventory at time of Impairment | $ 1,312 |  |
West | Continuing Operations |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Number of Communities Impaired | Community |  |  | 2
Number of Lots Impaired | lot |  |  | 213
Impairment Charge |  |  | $ 6,729
Estimated Fair Value of Impaired Inventory at time of Impairment |  |  | $ 16,345
West | Operating Segments | Continuing Operations |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Number of Communities Impaired | Community |  | 1 |
Number of Lots Impaired | lot |  | 46 |
Impairment Charge |  | $ 1,625 |
Estimated Fair Value of Impaired Inventory at time of Impairment |  | $ 3,791 |
East | Continuing Operations |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Number of Communities Impaired | Community |  |  | 1
Number of Lots Impaired | lot |  |  | 78
Impairment Charge |  |  | $ 5,894
Estimated Fair Value of Impaired Inventory at time of Impairment |  |  | $ 18,073

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