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Owned Inventory - Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 USD ($) lot home community | Sep. 30, 2024 USD ($) home | Sep. 30, 2023 USD ($)
Inventory Disclosure [Abstract] |  |  |
Number of homes under construction | home | 1,800 | 2,315 |
Number of homes under construction, spec homes | home | 1,078 | 1,154 |
Total, spec homes | $ 417,400 | $ 360,900 |
Number of homes under construction, in-process spec homes | home | 577 | 827 |
In-process spec homes | $ 201,800 | $ 231,400 |
Number of homes under construction, finished spec homes | home | 501 | 327 |
Finished spec homes | $ 215,600 | $ 129,500 |
Threshold number of homes below a minimum threshold of profitability | home | 10 |  |
Number of projects in progress impaired (in community) | community | 2 |  |
Total impairment charges on projects in progress | $ 8,642 | 0 | $ 0
Number of land held for sale lots impaired (in lot) | lot | 131 |  |
Total impairment charges on land held for sale | $ 2,733 | 0 | 0
Total abandonments charges | $ 1,584 | $ 1,996 | $ 641

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