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Inventory - Narrative (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) home Community | Sep. 30, 2017 USD ($) home | Mar. 31, 2017 Community
Inventory Disclosure [Abstract] |  |  |
Number of substantially completed homes unsold | home | 126 | 171 |
Total value of substantially completed homes | $ | $ 40.3 | $ 52.6 |
Threshold number of homes below a minimum threshold of profitability | home | 10 |  |
Real Estate Properties [Line Items] |  |  |
Number of communities on watch list | 2 |  | 6
Number of communities requiring further analysis | 0 |  | 0
West Segment |  |  |
Real Estate Properties [Line Items] |  |  |
Number of communities requiring further analysis | 1 |  | 5
Southeast Segment |  |  |
Real Estate Properties [Line Items] |  |  |
Number of communities requiring further analysis | 1 |  |
East Segment |  |  |
Real Estate Properties [Line Items] |  |  |
Number of communities requiring further analysis |  |  | 1

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- Definition Number of Communities, Undiscounted Cash Flow Analysis Prepared + References No definition available. + Details
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- Definition Number of Real Estate Properties, Completed Homes Unsold + References No definition available. + Details
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