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Inventory - Total Owned Inventory by Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Projects in Progress | $ 1,510,297 | $ 1,412,483
Land held for future development | 97,166 | 112,565
Land held for sale | 19,258 | 17,759
Total owned inventory | 1,626,721 | 1,542,807
Corporate and unallocated |  |
Segment Reporting Information [Line Items] |  |
Projects in Progress | 196,742 | 187,385
Land held for future development | 0 | 0
Land held for sale | 24 | 1,100
Total owned inventory | 196,766 | 188,485
West Segment | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Projects in Progress | 712,742 | 673,828
Land held for future development | 71,647 | 87,231
Land held for sale | 7,445 | 3,848
Total owned inventory | 791,834 | 764,907
East Segment | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Projects in Progress | 271,224 | 250,002
Land held for future development | 14,561 | 14,391
Land held for sale | 10,679 | 11,578
Total owned inventory | 296,464 | 275,971
Southeast Segment | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Projects in Progress | 329,589 | 301,268
Land held for future development | 10,958 | 10,943
Land held for sale | 1,110 | 1,233
Total owned inventory | $ 341,657 | $ 313,444

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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://www.xbrl.org/2003/role/presentationRef -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=6877327&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://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of land available for development. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 + Details
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