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Inventory - Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) lot Community | Jun. 30, 2018 USD ($)
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Number of properties included in land held for sale | Community |  |  | 6 |
Land Held for Sale | $ 0 | $ 168 | $ 38,588 | $ 168
Total impairment and abandonment charges | 0 | 168 | 148,618 | 618
Continuing Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Impairment charges on projects in progress | 0 | 0 | 110,030 | 0
Discontinued Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Land Held for Sale | 0 | 0 | 0 | 450
Total impairment and abandonment charges | 200 |  |  | 600
West Segment |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Land Held for Sale | 0 | 0 | 37,963 | 0
West Segment | Continuing Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Impairment charges on projects in progress | 0 | 0 | 92,912 | 0
East Segment |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Land Held for Sale | 0 | 168 | 0 | 168
Southeast Segment | Continuing Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Impairment charges on projects in progress | 0 | 0 | 858 | 0
Corporate and unallocated | Continuing Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Impairment charges on projects in progress | 0 | 0 | 16,260 | 0
Land Held for Sale | $ 0 | $ 0 | $ 625 | $ 0
CALIFORNIA |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Number of lots | lot |  |  | 732 |

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