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Inventory - Inventory Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Real Estate Properties [Line Items] |  |  |  |
Impairment charges on projects in progress | $ 0 | $ 0 | $ 0 | $ 110,030,000
Impairment of land held for sale | 1,257,000 | 0 | 1,257,000 | 38,588,000
Impairment charges, abandonments | 1,009,000 | 0 | 1,009,000 | 0
Inventory impairments and abandonments | 2,266,000 | 0 | 2,266,000 | 148,618,000
Corporate and unallocated |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment charges on projects in progress | 0 | 0 | 0 | 16,260,000
Impairment of land held for sale | 1,160,000 | 0 | 1,160,000 | 625,000
West Segment | Operating Segments |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment charges on projects in progress | 0 | 0 | 0 | 92,912,000
Impairment of land held for sale | 89,000 | 0 | 89,000 | 37,963,000
Impairment charges, abandonments | 452,000 | 0 | 452,000 | 0
East Segment | Operating Segments |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment charges, abandonments | 32,000 | 0 | 32,000 | 0
Southeast Segment | Operating Segments |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment charges on projects in progress | 0 | 0 | 0 | 858,000
Impairment of land held for sale | 8,000 | 0 | 8,000 | 0
Impairment charges, abandonments | $ 525,000 | $ 0 | $ 525,000 | $ 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2611-110228 + Details
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