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Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2022 USD ($) home | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Threshold number of homes below a minimum threshold of profitability | home | 10 |  |  |
Measurement threshold of likelihood of being realized (percent) | 50.00% |  |  |
Income tax, refund claim |  |  |  | $ 4,600
Alternative minimum tax credit |  |  | $ 4,600 | $ 9,200
Income tax receivable, alternative minimum tax |  |  | 9,200 |
Customer deposits | $ 34,270 | $ 28,526 |  |
Contract with customer, liability, revenue recognized | 26,300 |  |  |
Refunded by buyer | 1,200 |  |  |
Advertising costs | $ 14,400 | $ 14,000 | $ 15,900 |
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) | 1.00% |  |  |

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