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

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

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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.

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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.

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Carrying amount of land available for development.

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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.

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