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Segment Information - Schedule of Assets by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Sep. 30, 2025
Segment Reporting [Line Items]
Total assets	$ 2,904,750	$ 2,609,708
Operating Segments | West
Segment Reporting [Line Items]
Total assets	1,211,517	1,060,650
Operating Segments | East
Segment Reporting [Line Items]
Total assets	519,134	451,299
Operating Segments | Southeast
Segment Reporting [Line Items]
Total assets	547,375	461,110
Corporate and unallocated
Segment Reporting [Line Items]
Total assets	$ 626,724	$ 636,649

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