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Owned Inventory - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) home | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) home | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of homes under construction | home | 3,568 |  | 3,568 |  | 2,912
Number of homes under construction, spec homes | home | 775 |  | 775 |  | 576
Total, spec homes | $ 157,200,000 |  | $ 157,200,000 |  | $ 116,400,000
Number of homes under Construction, in-process spec homes | home | 725 |  | 725 |  | 542
In-process spec homes | $ 139,000,000 |  | $ 139,000,000 |  | $ 105,200,000
Number of homes under construction, finished spec homes | home | 50 |  | 50 |  | 34
Finished spec homes | $ 18,200,000 |  | $ 18,200,000 |  | $ 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 | 440,000 | 0 | 440,000 | 0 |
Total abandonments charges | $ 495,000 | $ 0 | $ 495,000 | $ 465,000 |

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