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Inventory - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) home Community | Jun. 30, 2018 USD ($) Community | Jun. 30, 2019 USD ($) home Community | Jun. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of substantially completed homes unsold | home | 185 |  | 185 |  | 240
Total value of substantially completed homes | $ | $ 62,600 |  | $ 62,600 |  | $ 84,800
Threshold number of homes below a minimum threshold of profitability | home |  |  | 10 |  |
Impairment and abandonment charges | $ | $ 0 | $ 168 | $ 148,618 | $ 618 |
Number of communities impaired | Community |  |  | 10 |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of communities on watch list | Community | 5 | 4 |  |  |
Inventory impairment charge | $ |  |  | $ 110,030 |  |
Land Held for Sale | $ | $ 0 | $ 168 | $ 38,588 | 168 |
Number of properties included in land held for sale | Community |  |  | 6 |  |
West Segment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of communities on watch list | Community | 3 | 2 |  |  |
Land Held for Sale | $ | $ 0 | $ 0 | $ 37,963 | 0 |
East Segment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of communities on watch list | Community | 1 |  |  |  |
Land Held for Sale | $ | $ 0 | $ 168 | $ 0 | $ 168 |
Southeast Segment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of communities on watch list | Community | 1 | 2 |  |  |

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