Owned Inventory - Schedule of Total Owned Inventory by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Projects in progress	$ 2,188,752	$ 2,001,675
Land Held for Future Development	19,489	19,879
Land Held for Sale	25,166	19,086
Total owned inventory	2,233,407	2,040,640
Corporate and unallocated
Segment Reporting Information [Line Items]
Projects in progress	217,039	200,945
Land Held for Future Development	0	0
Land Held for Sale	0	0
Total owned inventory	217,039	200,945
West \| Operating Segments
Segment Reporting Information [Line Items]
Projects in progress	1,084,739	1,023,140
Land Held for Future Development	3,483	3,483
Land Held for Sale	17,552	17,110
Total owned inventory	1,105,774	1,043,733
East \| Operating Segments
Segment Reporting Information [Line Items]
Projects in progress	473,491	411,914
Land Held for Future Development	10,888	10,888
Land Held for Sale	4,837	1,300
Total owned inventory	489,216	424,102
Southeast \| Operating Segments
Segment Reporting Information [Line Items]
Projects in progress	413,483	365,676
Land Held for Future Development	5,118	5,508
Land Held for Sale	2,777	676
Total owned inventory	$ 421,378	$ 371,860

Carrying amount as of the balance sheet date of project in progress

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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
-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

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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

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- Definition

Carrying amount of land available for development.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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