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Inventory - Results of Discounted Cash Flow Analysis (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) Community lot | Sep. 30, 2018 USD ($) Community lot
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Impairment Charge | $ 109,000 | $ 1,700 | $ 131,700 | $ 4,200
Continuing Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Number of communities impaired | Community |  |  | 10 | 1
Number of Lots Impaired | lot |  |  | 854 | 25
Impairment Charge |  |  | $ 110,030 | $ 1,005
Estimated Fair Value of Impaired Inventory |  |  | $ 84,982 | $ 1,312
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 |  |  | $ 16,260 | $ 212
Estimated Fair Value of Impaired Inventory |  |  | $ 14,166 | $ 0
West | Operating Segments | Continuing Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Number of communities impaired | Community |  |  | 9 |
Number of Lots Impaired | lot |  |  | 839 |
Impairment Charge |  |  | $ 92,912 |
Estimated Fair Value of Impaired Inventory |  |  | $ 69,449 |
Southeast | Operating Segments | Continuing Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Number of communities impaired | Community |  |  | 1 | 1
Number of Lots Impaired | lot |  |  | 15 | 25
Impairment Charge |  |  | $ 858 | $ 793
Estimated Fair Value of Impaired Inventory |  |  | $ 1,367 | $ 1,312

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