Owned Inventory - Schedule of Inventory Impairments and Abandonment Charges, by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Real Estate, Write-down or Reserve [Line Items]
Total impairment charges on projects in progress	$ 8,642	$ 0	$ 0
Total impairment charges on land held for sale	2,733	0	0
Total abandonments charges	1,584	1,996	641
Total impairment and abandonment charges	12,959	1,996	641
Corporate and unallocated
Real Estate, Write-down or Reserve [Line Items]
Total impairment charges on projects in progress	1,002	0	0
Total impairment charges on land held for sale	1,238	0	0
West | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Total impairment charges on projects in progress	2,236	0	0
Total impairment charges on land held for sale	1,495	0	0
Total abandonments charges	921	1,805	487
East | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Total abandonments charges	215	91	154
Southeast | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Total impairment charges on projects in progress	5,404	0	0
Total abandonments charges	$ 448	$ 100	$ 0