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Inventory - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) home Community | Jun. 30, 2015 Community | Jun. 30, 2016 USD ($) home Community | Sep. 30, 2015 USD ($) home
Real Estate Properties [Line Items] |  |  |  |
Number of substantially completed homes unsold | home | 172 |  | 172 | 128
Total value of substantially completed homes | $ | $ 47.3 |  | $ 47.3 | $ 40.1
Threshold number of homes below a minimum threshold of profitability | home |  |  | 10 |
Number of communities on watch list | 3 | 0 |  |
Number of Communities Impaired | 2 |  | 3 |
East Segment |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of communities on watch list | 1 |  |  |
Number of Communities Impaired | 1 |  | 1 |

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