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Inventory - Narrative (Details) | 3 Months Ended | 9 Months Ended |
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Jun. 30, 2026 USD ($) home | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) home community | Jun. 30, 2025 USD ($) | Sep. 30, 2025 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of homes under construction | home | 2,532 |  | 2,532 |  | 1,800
Number of homes under construction, spec homes | home | 1,403 |  | 1,403 |  | 1,078
Total, spec homes | $ 513,100,000 |  | $ 513,100,000 |  | $ 417,400,000
Number of homes under construction, in-process spec homes | home | 1,016 |  | 1,016 |  | 577
In-process spec homes | $ 339,600,000 |  | $ 339,600,000 |  | $ 201,800,000
Number of homes under construction, finished spec homes | home | 387 |  | 387 |  | 501
Finished spec homes | $ 173,500,000 |  | $ 173,500,000 |  | $ 215,600,000
Threshold number of homes below a minimum threshold of profitability | home |  |  | 10 |  |
Total impairment charges on projects in progress | 0 | $ 8,642,000 | $ 1,295,000 | $ 8,642,000 |
Number of projects in progress impaired (in community) | community |  |  | 1 |  |
Total impairment charges on land held for sale | 2,342,000 | 1,466,000 | $ 3,387,000 | 1,466,000 |
Number of impaired land held for sale communities (in community) | community |  |  | 4 |  |
Estimated fair value less cost to sell of land held for sale assets at time of impairment | 34,000,000.0 |  | $ 34,000,000.0 |  |
Abandonments charges | $ 0 | $ 231,000 | $ 1,325,000 | $ 759,000 |

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