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Inventory - Results of Discounted Cash Flow Analysis (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) lot Community | Mar. 31, 2019 USD ($) lot Community
Real Estate, Write-down or Reserve [Line Items] |  |
Number of Communities Impaired | Community | 9 | 10
Number of Lots Impaired | lot | 839 | 854
Impairment Charge | $ 109,023 | $ 110,030
Estimated Fair Value of Impaired Inventory at time of Impairment | $ 83,377 | $ 84,982
Continuing Operations | West Segment |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Number of Communities Impaired | Community | 9 | 9
Number of Lots Impaired | lot | 839 | 839
Impairment Charge | $ 92,912 | $ 92,912
Estimated Fair Value of Impaired Inventory at time of Impairment | $ 69,449 | $ 69,449
Continuing Operations | Southeast Segment |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Number of Communities Impaired | Community | 0 | 1
Number of Lots Impaired | lot | 0 | 15
Impairment Charge | $ 0 | $ 858
Estimated Fair Value of Impaired Inventory at time of Impairment | $ 0 | $ 1,367
Corporate and unallocated | Continuing Operations |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Number of Communities Impaired | Community | 0 | 0
Number of Lots Impaired | lot | 0 | 0
Impairment Charge | $ 16,111 | $ 16,260
Estimated Fair Value of Impaired Inventory at time of Impairment | $ 13,928 | $ 14,166

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