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Owned Inventory - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) community lot home | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) home lot community | Jun. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of homes under construction | home | 2,539 |  | 2,539 |  | 2,315
Number of homes under construction, spec homes | home | 1,376 |  | 1,376 |  | 1,154
Total, spec homes | $ 490,500 |  | $ 490,500 |  | $ 360,900
Number of homes under construction, in-process spec homes | home | 1,004 |  | 1,004 |  | 827
In-process spec homes | $ 332,200 |  | $ 332,200 |  | $ 231,400
Number of homes under construction, finished spec homes | home | 372 |  | 372 |  | 327
Finished spec homes | $ 158,300 |  | $ 158,300 |  | $ 129,500
Threshold number of homes below a minimum threshold of profitability | home |  |  | 10 |  |
Number of communities impaired (in community) | community | 2 |  | 2 |  |
Total impairment charges on projects in progress | $ 8,642 | $ 0 | $ 8,642 | $ 0 |
Number of land held for sale lots impaired (in lot) | lot | 38 |  | 38 |  |
Total impairment charges on land held for sale | $ 1,466 | 0 | $ 1,466 | 0 |
Abandonments charges | 231 | 200 | 759 | 200 |
Inventory impairments and abandonments | $ 10,339 | $ 200 | $ 10,867 | $ 200 |

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