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Owned Inventory - Results of Discounted Cash Flow Analysis (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) community lot
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Impairment Charge | $ 109,000 | $ 900 | $ 1,700 | $ 131,700
Continuing Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Number of communities impaired | community |  |  |  | 10
Number of Lots Impaired | lot |  |  |  | 854
Impairment Charge |  |  |  | $ 110,030
Estimated Fair Value of Impaired Inventory |  |  |  | $ 84,982
Corporate and unallocated | Continuing Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Number of communities impaired | community |  |  |  | 0
Number of Lots Impaired | lot |  |  |  | 0
Impairment Charge |  |  |  | $ 16,260
Estimated Fair Value of Impaired Inventory |  |  |  | $ 14,166
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
Number of Lots Impaired | lot |  |  |  | 15
Impairment Charge |  |  |  | $ 858
Estimated Fair Value of Impaired Inventory |  |  |  | $ 1,367

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