Segment Information - Schedule of Assets by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Segment Reporting Information [Line Items]
Total assets	$ 2,757,480	$ 2,609,708
Corporate and unallocated
Segment Reporting Information [Line Items]
Total assets	602,002	636,649
West | Operating Segments
Segment Reporting Information [Line Items]
Total assets	1,145,883	1,060,650
East | Operating Segments
Segment Reporting Information [Line Items]
Total assets	482,256	451,299
Southeast | Operating Segments
Segment Reporting Information [Line Items]
Total assets	$ 527,339	$ 461,110