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Owned Inventory - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 USD ($) home | Mar. 31, 2024 USD ($) | Mar. 31, 2025 USD ($) home | Mar. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of homes under construction | home | 2,555 |  | 2,555 |  | 2,315
Number of homes under construction, spec homes | home | 1,306 |  | 1,306 |  | 1,154
Total, spec homes | $ 414,700,000 |  | $ 414,700,000 |  | $ 360,900,000
Number of homes under construction, in-process spec homes | home | 1,019 |  | 1,019 |  | 827
In-process spec homes | $ 295,300,000 |  | $ 295,300,000 |  | $ 231,400,000
Number of homes under construction, finished spec homes | home | 287 |  | 287 |  | 327
Finished spec homes | $ 119,400,000 |  | $ 119,400,000 |  | $ 129,500,000
Threshold number of homes below a minimum threshold of profitability | home |  |  | 10 |  |
Impairment of projects in process | 0 | $ 0 | $ 0 | $ 0 |
Impairment charges on land held for sale | 0 | 0 | 0 | 0 |
Abandonments charges | $ 528,000 | $ 0 | $ 528,000 | $ 0 |

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