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Owned Inventory - Narrative (Details) | 12 Months Ended
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Sep. 30, 2024 USD ($) home | Sep. 30, 2023 USD ($) home | Sep. 30, 2022 USD ($) community
Segment Reporting Information [Line Items] |  |  |
Number of homes under construction | home | 2,315 | 2,163 |
Number of homes under construction, spec homes | home | 1,154 | 779 |
Total, spec homes | $ 360,900,000 | $ 218,000,000.0 |
Number of homes under construction, in-process spec homes | home | 827 | 645 |
In-process spec homes | $ 231,400,000 | $ 162,000,000.0 |
Number of homes under construction, finished spec homes | home | 327 | 134 |
Finished spec homes | $ 129,500,000 | $ 56,000,000.0 |
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 | 0 | 1,868,000
Fair value of impaired long-lived assets to be disposed of |  |  | 900,000
Abandonments | $ 1,996,000 | $ 641,000 | $ 1,095,000
West |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of communities | community |  |  | 2

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