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Inventory - Total Owned Inventory by Segment (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Projects in progress | $ 1,351,697 | $ 1,309,585
Land held for future development | 23,068 | 28,531
Land held for sale | 8,851 | 12,622
Total owned inventory | 1,383,616 | 1,350,738
Corporate and unallocated |  |
Segment Reporting Information [Line Items] |  |
Projects in progress | 164,963 | 172,895
Land held for future development | 0 | 0
Land held for sale | 0 | 0
Total owned inventory | 164,963 | 172,895
West Segment | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Projects in progress | 649,686 | 627,986
Land held for future development | 3,483 | 3,483
Land held for sale | 1,475 | 4,516
Total owned inventory | 654,644 | 635,985
East Segment | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Projects in progress | 264,031 | 241,799
Land held for future development | 14,077 | 14,077
Land held for sale | 2,433 | 3,702
Total owned inventory | 280,541 | 259,578
Southeast Segment | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Projects in progress | 273,017 | 266,905
Land held for future development | 5,508 | 10,971
Land held for sale | 4,943 | 4,404
Total owned inventory | $ 283,468 | $ 282,280

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- Definition Carrying amount as of the balance sheet date of parcels of land held for sale, and on which the entity has no intention or no further intention to perform construction activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The net carrying amount as of the balance sheet date of the sum of the various components of an operative builder's inventory, including finished homes. Operative builders primarily consist of entities that develop land, construct residential homes and commercial and industrial buildings thereon, and sell them to home buyers and operators of the commercial and industrial properties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Carrying amount of land available for development. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1(d)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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