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Inventory - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) home | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) home | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of substantially completed homes unsold | home | 40 |  | 40 |  | 133
Total value of substantially completed homes | $ 12,000,000.0 |  | $ 12,000,000.0 |  | $ 42,200,000
Threshold number of homes below a minimum threshold of profitability | home |  |  | 10 |  |
Impairment charges on land held for sale | 0 | $ 1,257,000 | $ 0 | $ 1,257,000 |
Abandonment charges | $ 231,000 | $ 1,009,000 | $ 696,000 | $ 1,009,000 |

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