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Inventory - Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Real Estate, Write-down or Reserve [Line Items] |  |
Total impairment and abandonment charges | $ 1,007 | $ 450
Continuing Operations |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Impairment charges on projects in progress | 1,007 | 0
Discontinued Operations |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Land Held for Sale | 0 | 450
Southeast Segment | Continuing Operations |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Impairment charges on projects in progress | 858 | 0
Corporate and unallocated | Continuing Operations |  |
Real Estate, Write-down or Reserve [Line Items] |  |
Impairment charges on projects in progress | $ 149 | $ 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=98514028&loc=d3e3602-108585 + Details
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