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Owned Inventory - Narrative (Details) | 3 Months Ended
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Dec. 31, 2021 USD ($) home | Dec. 31, 2020 USD ($) home
Inventory Disclosure [Abstract] |  |
Number of homes under construction | home | 3,196 | 2,912
Number of homes under construction, spec homes | home | 744 | 576
Total, spec homes | $ | $ 150,800,000 | $ 116,400,000
Number of homes under Construction, in-process spec homes | home | 711 | 542
In-process spec homes | $ | $ 139,500,000 | $ 105,200,000
Number of homes under construction, finished spec homes | home | 33 | 34
Finished spec homes | $ | $ 11,300,000 | $ 11,200,000
Threshold number of homes below a minimum threshold of profitability | home | 10 |
Impairment charges on land held for sale | $ | $ 0 | 0
Abandonment charges | $ | $ 0 | $ 500,000

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