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Inventory - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) home | Dec. 31, 2020 USD ($) contract | Mar. 31, 2021 USD ($) home | Sep. 30, 2020 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |
Number of substantially completed homes unsold | home | 87 |  | 87 | 133
Total value of substantially completed homes | $ | $ 26.2 |  | $ 26.2 | $ 42.2
Threshold number of homes below a minimum threshold of profitability | home |  |  | 10 |
Impairment charges, abandonments | $ | $ 0.0 | $ 0.5 | $ 0.0 |
Number of terminated land contracts under acquisition | contract |  | 1 |  |

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