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Owned Inventory - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) home | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) home | Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of homes under construction | home | 2,783 |  | 2,783 |  | 2,163
Number of homes under construction, spec homes | home | 1,135 |  | 1,135 |  | 779
Total, spec homes | $ 353,300,000 |  | $ 353,300,000 |  | $ 218,000,000
Number of homes under construction, in-process spec homes | home | 899 |  | 899 |  | 645
In-process spec homes | $ 261,100,000 |  | $ 261,100,000 |  | $ 162,000,000
Number of homes under construction, finished spec homes | home | 236 |  | 236 |  | 134
Finished spec homes | $ 92,200,000 |  | $ 92,200,000 |  | $ 56,000,000
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 | $ 200,000 | $ 315,000 | $ 200,000 | $ 616,000 |

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