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Owned Inventory - Narrative (Details) | 12 Months Ended
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Sep. 30, 2023 USD ($) home | Sep. 30, 2022 USD ($) home community | Sep. 30, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of homes under construction | home | 2,163 | 2,688 |
Number of homes under construction, spec homes | home | 779 | 887 |
Total, spec homes | $ 218,000,000 | $ 246,500,000 |
Number of homes under construction, in-process spec homes | home | 645 | 793 |
In-process spec homes | $ 162,000,000 | $ 208,700,000 |
Number of homes under construction, finished spec homes | home | 134 | 94 |
Finished spec homes | $ 56,000,000 | $ 37,800,000 |
Threshold number of homes below a minimum threshold of profitability | home | 10 |  |
Impairment of projects in process | $ 0 | 0 | $ 0
Land held for sale | 0 | 1,868,000 | 0
Fair value of impaired long-lived assets to be disposed of |  | 900,000 |
Abandonments | $ 641,000 | $ 1,095,000 | $ 853,000
West |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of communities | community |  | 2 |

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