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Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2017 home | Sep. 30, 2017 lot | Sep. 30, 2017 | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Threshold number of homes below a minimum threshold of profitability |  | 10 | 10 |  |  |  |
Measurement threshold of likelihood of being realized (percent) |  |  |  | 50.00% |  |  |
Advertising costs |  |  |  |  | $ 17.5 | $ 19.2 | $ 18.0
Minimum |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated time to develop, sell, construct and close all homes (in years) | 3 years |  |  |  |  |  |
Estimated future warranty costs as a percentage or revenue (percent) |  |  |  | 0.30% |  |  |
Minimum | Furniture, Fixtures, Computer and Office Equipment |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life | 3 years |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated time to develop, sell, construct and close all homes (in years) | 5 years |  |  |  |  |  |
Estimated future warranty costs as a percentage or revenue (percent) |  |  |  | 1.20% |  |  |
Maximum | Information systems |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life | 5 years |  |  |  |  |  |
Maximum | Furniture, Fixtures, Computer and Office Equipment |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life | 7 years |  |  |  |  |  |

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