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Inventory - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) home Community | Mar. 31, 2019 USD ($) Community | Mar. 31, 2020 USD ($) home Community | Mar. 31, 2019 USD ($) Community | Sep. 30, 2019 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of substantially completed homes unsold | home | 243 |  | 243 |  | 238
Total value of substantially completed homes | $ 80,500,000 |  | $ 80,500,000 |  | $ 82,200,000
Threshold number of homes below a minimum threshold of profitability | home |  |  | 10 |  |
Number of communities on watch list | Community | 3 | 12 | 3 | 12 |
Impairment charge |  |  |  | $ 109,000,000 |
Inventory impairments and abandonments | $ 0 | $ 147,611,000 | $ 0 | $ 148,618,000 |
Number of impaired communities | Community |  |  |  | 9 |
Impairment of land held for sale |  | $ 38,600,000.0 |  | $ 38,588,000 |
Number of properties included in land held for sale | Community |  |  |  | 6 |

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