Owned Inventory - Schedule of Inventory Impairments and Abandonment Charges, by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Real Estate Properties [Line Items]
Total impairment charges on projects in progress	$ 8,642	$ 0	$ 8,642	$ 0
Total impairment charges on land held for sale	1,466	0	1,466	0
Total abandonments charges	231	200	759	200
Inventory impairments and abandonments	10,339	200	10,867	200
Corporate and unallocated
Real Estate Properties [Line Items]
Total impairment charges on projects in progress	1,002	0	1,002	0
Total impairment charges on land held for sale	621	0	621	0
West | Operating Segments
Real Estate Properties [Line Items]
Total impairment charges on projects in progress	2,236	0	2,236	0
Total impairment charges on land held for sale	845	0	845	0
Total abandonments charges	0	9	528	9
East | Operating Segments
Real Estate Properties [Line Items]
Total abandonments charges	0	91	0	91
Southeast | Operating Segments
Real Estate Properties [Line Items]
Total impairment charges on projects in progress	5,404	0	5,404	0
Total abandonments charges	$ 231	$ 100	$ 231	$ 100