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Inventory - Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) home Community | Sep. 30, 2017 USD ($) home lot Community | Sep. 30, 2017 USD ($) home Community | Sep. 30, 2017 USD ($) home Community | Sep. 30, 2016 USD ($) home Community | Sep. 30, 2015 Community
Real Estate [Abstract] |  |  |  |  |  |
Number of substantially completed homes not subject to a sales contract | home | 171 | 171 | 171 | 171 | 178 |
Total value of substantially completed homes | $ | $ 52,600 | $ 52,600 | $ 52,600 | $ 52,600 | $ 56,100 |
Threshold number of homes below a minimum threshold of profitability | 10 | 10 |  |  |  |
Number of watch list communities requiring further analysis | Community | 2 | 2 | 2 | 2 | 7 | 0
Impairment charge | $ |  |  |  | $ 1,693 | $ 13,724 |
Number of Communities Impaired | Community |  |  | 1 |  | 3 |

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