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Inventory - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) home lot Community | Mar. 31, 2018 USD ($) Community | Mar. 31, 2019 USD ($) home Community | Mar. 31, 2018 USD ($) Community | Sep. 30, 2018 USD ($) home
Inventory Disclosure [Abstract] |  |  |  |  |
Number of substantially completed homes unsold | home | 159 |  | 159 |  | 240
Total value of substantially completed homes | $ | $ 60,000 |  | $ 60,000 |  | $ 84,800
Threshold number of homes below a minimum threshold of profitability | home |  |  | 10 |  |
Impairment and abandonment charges | $ | $ 147,611 | $ 0 | $ 148,618 |  |
Properties land held for sale and impaired properties | 15 |  |  |  |
Number of Communities Impaired | 9 |  | 10 |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of communities on watch list | 12 | 2 | 12 | 2 |
Number of communities requiring further analysis | 9 | 0 | 9 | 0 |
Inventory impairment charge | $ | $ 109,023 |  | $ 110,030 |  |
Land Held for Sale | $ | $ 38,588 | $ 0 | $ 38,588 | $ 0 |
Number of properties included in land held for sale | 6 |  |  |  |
West Segment |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of communities on watch list | 12 |  | 12 |  |
Number of communities requiring further analysis | 9 |  | 9 |  |
Land Held for Sale | $ | $ 37,963 | $ 0 | $ 37,963 | $ 0 |
Southern California market |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of communities requiring further analysis | 9 |  | 9 |  |
Inventory impairment charge | $ | $ 109,000 |  |  |  |
Number of lots | lot | 839 |  |  |  |
Northern and Southern California market |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of lots | lot | 732 |  |  |  |
Land Held for Sale | $ | $ 38,600 |  |  |  |
Number of properties included in land held for sale |  |  | 6 |  |

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