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Owned Inventory - Narrative (Details) | 12 Months Ended
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Sep. 30, 2022 USD ($) community home | Sep. 30, 2021 USD ($) home | Sep. 30, 2020 USD ($) community
Segment Reporting Information [Line Items] |  |  |
Number of homes under construction | home | 2,688 | 2,912 |
Number of homes under construction, spec homes | home | 887 | 576 |
Total, spec homes | $ 246,500,000 | $ 116,400,000 |
Number of homes under construction, in-process spec homes | home | 793 | 542 |
In-process spec homes | $ 208,700,000 | $ 105,200,000 |
Number of homes under construction, finished spec homes | home | 94 | 34 |
Finished spec homes | $ 37,800,000 | $ 11,200,000 |
Threshold number of homes below a minimum threshold of profitability | home | 10 |  |
Impairment of projects in process | $ 0 | 0 | $ 0
Land held for sale | 1,900,000 | 0 | $ 1,300,000
Number of communities | community |  |  | 2
Abandonments | $ 1,095,000 | $ 853,000 | $ 1,646,000
West |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of communities | community | 2 |  | 1
Southeast |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of communities | community |  |  | 1

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