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Owned Inventory - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) home | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) home | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of homes under construction | home | 3,656 |  | 3,656 |  | 2,912
Number of homes under construction, spec homes | home | 936 |  | 936 |  | 576
Total, spec homes | $ 212,800,000 |  | $ 212,800,000 |  | $ 116,400,000
Number of homes under Construction, in-process spec homes | home | 881 |  | 881 |  | 542
In-process spec homes | $ 191,000,000 |  | $ 191,000,000 |  | $ 105,200,000
Number of homes under construction, finished spec homes | home | 55 |  | 55 |  | 34
Finished spec homes | $ 21,800,000 |  | $ 21,800,000 |  | $ 11,200,000
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 | 0 | 440,000 | 0 |
Total abandonments charges | $ 0 | $ 231,000 | $ 495,000 | $ 696,000 |

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