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Owned Inventory - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 USD ($) home | Mar. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) home | Mar. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of homes under construction | home | 2,381 |  | 2,381 |  | 2,688
Number of homes under construction, spec homes | home | 787 |  | 787 |  | 887
Total, spec homes | $ 222,000,000 |  | $ 222,000,000 |  | $ 246,500,000
Number of homes under construction, in-process spec homes | home | 629 |  | 629 |  | 793
In-process spec homes | $ 156,600,000 |  | $ 156,600,000 |  | $ 208,700,000
Number of homes under construction, finished spec homes | home | 158 |  | 158 |  | 94
Finished spec homes | $ 65,400,000 |  | $ 65,400,000 |  | $ 37,800,000
Threshold number of homes below a minimum threshold of profitability | home |  |  | 10 |  |
Impairment of projects in process | 0 | $ 0 | $ 0 | $ 0 |
Total impairment charges on land held for sale | 0 | 440,000 | 0 | 440,000 |
Fair value of impaired long-lived assets to be disposed of |  | 900,000 |  | 900,000 |
Total abandonments charges | $ 111,000 | $ 495,000 | $ 301,000 | $ 495,000 |

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