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Inventory - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) home lot Community | Mar. 31, 2015 USD ($) property | Mar. 31, 2016 USD ($) home lot Community | Mar. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) home
Real Estate Properties [Line Items] |  |  |  |  |
Threshold Number of Homes Below a Minimum Threshold of Profitability | home |  |  | 10 |  |
Discounted Cash Flow Analyses, Number of Lots Impaired | lot | 34 |  | 34 |  |
Number of substantially completed homes unsold | home | 117 |  | 117 |  | 128
Total value of substantially completed homes | $ 33,100 |  | $ 33,100 |  | $ 40,100
Number of Communities on Watch List | 2 | 2 |  |  |
Undiscounted Cash Flow Analysis Prepared for Number of Communities | 2 | 2 |  |  |
Impairment Charge | $ 1,825 |  | 1,825 |  |
Inventory Impairment and Abandonment | $ 1,825 | $ 0 | $ 3,181 | $ 0 |
Discounted Cash Flow Analyses, Number of Impaired Communities | 1 | 1 | 1 |  |

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