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Inventory - Schedule of Discounted Cash Flow Analysis (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) lot Community | Mar. 31, 2015 property | Mar. 31, 2016 USD ($) lot Community
Real Estate, Write-down or Reserve [Line Items] |  |  |
Discounted Cash Flow Analyses, Number of Impaired Communities | 1 | 1 | 1
Number of Lots Impaired | lot | 34 |  | 34
Impairment Charge | $ 1,825 |  | $ 1,825
Estimated Fair Value of Impaired Inventory at Period End | $ 5,518 |  | $ 5,518
West Segment |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Discounted Cash Flow Analyses, Number of Impaired Communities | Community | 1 |  | 1
Number of Lots Impaired | lot | 34 |  | 34
Impairment Charge | $ 1,513 |  | $ 1,513
Estimated Fair Value of Impaired Inventory at Period End | $ 5,518 |  | $ 5,518
Corporate and unallocated |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Discounted Cash Flow Analyses, Number of Impaired Communities | Community | 0 |  | 0
Number of Lots Impaired | lot | 0 |  | 0
Impairment Charge | $ 312 |  | $ 312
Estimated Fair Value of Impaired Inventory at Period End | $ 0 |  | $ 0

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