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Inventory - Schedule of Total Owned Inventory by Segment (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Sep. 30, 2025
--- | --- | ---
Segment Reporting [Line Items] |  |
Projects in progress | $ 2,262,439 | $ 1,962,576
Land Held for Future Development | 19,489 | 19,489
Land Held for Sale | 87,542 | 47,368
Total inventory | 2,369,470 | 2,029,433
Operating Segments | West |  |
Segment Reporting [Line Items] |  |
Projects in progress | 1,066,860 | 944,601
Land Held for Future Development | 3,483 | 3,483
Land Held for Sale | 50,472 | 29,052
Total inventory | 1,120,815 | 977,136
Operating Segments | East |  |
Segment Reporting [Line Items] |  |
Projects in progress | 457,324 | 387,954
Land Held for Future Development | 10,888 | 10,888
Land Held for Sale | 18,365 | 16,086
Total inventory | 486,577 | 414,928
Operating Segments | Southeast |  |
Segment Reporting [Line Items] |  |
Projects in progress | 490,081 | 418,497
Land Held for Future Development | 5,118 | 5,118
Land Held for Sale | 18,705 | 2,230
Total inventory | 513,904 | 425,845
Corporate and unallocated |  |
Segment Reporting [Line Items] |  |
Projects in progress | 248,174 | 211,524
Land Held for Future Development | 0 | 0
Land Held for Sale | 0 | 0
Total inventory | $ 248,174 | $ 211,524

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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/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + 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/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480657/210-10-S50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 970 -SubTopic 360 -Name Accounting Standards Codification -Section 35 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479166/970-360-35-3 + Details
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