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Inventory - Narrative (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) home Community | Dec. 31, 2017 USD ($) Community | Sep. 30, 2018 USD ($) home
Inventory Disclosure [Abstract] |  |  |
Number of substantially completed homes unsold | home | 223 |  | 240
Total value of substantially completed homes | $ | $ 83,900 |  | $ 84,800
Threshold number of homes below a minimum threshold of profitability | home | 10 |  |
Inventory impairment charge | $ | $ 1,007 | $ 500 |
Real Estate Properties [Line Items] |  |  |
Number of communities on watch list | 4 | 2 |
Number of communities requiring further analysis | 1 | 0 |
West Segment |  |  |
Real Estate Properties [Line Items] |  |  |
Number of communities on watch list | 3 |  |
Number of communities requiring further analysis | 0 |  |
Southeast Segment |  |  |
Real Estate Properties [Line Items] |  |  |
Number of communities on watch list | 1 |  |
Number of communities requiring further analysis | 1 |  |

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