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Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |
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Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) home | Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) lot | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Oct. 01, 2019 USD ($)
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% |  |  |  |
Federal and state tax carryforwards | $ 192,981 | $ 192,981 | $ 192,981 | $ 192,981 | $ 192,981 | $ 208,360 |  |
Alternative minimum tax credit |  |  |  |  |  | 4,600 |  |
Customer deposits | 18,937 | 18,937 | 18,937 | 18,937 | 18,937 | 11,539 |  |
Contract with customer, liability, revenue recognized |  | 10,500 |  |  |  |  |  |
Refunded by buyer |  | 1,000 |  |  |  |  |  |
Advertising costs |  | 15,900 |  |  |  | 17,900 | $ 17,600 |
Operating lease right-of-use assets | 13,103 | 13,103 | 13,103 | 13,103 | 13,103 | 0 |  |
Operating lease liabilities | 15,333 | 15,333 | 15,333 | 15,333 | 15,333 | $ 0 |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Operating lease right-of-use assets | 13,895 | 13,895 | 13,895 | 13,895 | 13,895 |  |  | $ 13,900
Operating lease liabilities | $ 16,028 | $ 16,028 | $ 16,028 | $ 16,028 | $ 16,028 |  |  | $ 16,000
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% |  |  |  |
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) |  |  |  | 1.30% |  |  |  |

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