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Inventory - Inventory Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Real Estate, Write-down or Reserve [Line Items] |  |  |
Land Held for Sale | $ 600 | $ 800 | $ 1,400
Continuing Operations |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Projects in progress | 1,693 | 13,724 | 0
Land Held for Sale | 564 | 770 | 1,433
Abandonments | 188 | 788 | 1,676
Total impairment and abandonment charges | 2,445 | 15,282 | 3,109
Continuing Operations | Corporate and unallocated |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Projects in progress | 68 | 1,101 | 0
Continuing Operations | West |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Projects in progress | 1,625 | 6,729 | 0
Land Held for Sale | 94 | 119 | 0
Continuing Operations | East |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Projects in progress | 0 | 5,894 | 0
Land Held for Sale | 470 | 280 | 1,433
Abandonments | 188 | 0 | 1,676
Continuing Operations | Southeast |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Land Held for Sale | 0 | 371 | 0
Abandonments | $ 0 | $ 788 | $ 0

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2611-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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