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Inventory - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 property Community | Mar. 31, 2017 USD ($) home Community | Mar. 31, 2016 property Community | Sep. 30, 2016 USD ($) home | Mar. 31, 2016 Community
Inventory Disclosure [Abstract] |  |  |  |  |
Number of substantially completed homes unsold | home |  | 119 |  | 178 |
Total value of substantially completed homes | $ |  | $ 34.7 |  | $ 56.1 |
Threshold number of homes below a minimum threshold of profitability | home |  | 10 |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of communities on watch list | 9 | 6 | 9 |  | 2
Number of communities requiring further analysis | 2 | 0 | 2 |  |
Number of communities impaired | 1 |  | 1 |  |
West Segment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of communities on watch list |  | 5 |  |  |
East Segment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of communities on watch list |  | 1 |  |  |

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