Inventory - Schedule of Inventory Impairments and Abandonment Charges, by Reportable Segment (Details) - USD ($)	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Real Estate Properties [Line Items]
Total impairment charges on projects in progress	$ 0	$ 8,642,000	$ 1,295,000	$ 8,642,000
Total impairment charges on land held for sale	2,342,000	1,466,000	3,387,000	1,466,000
Total abandonments charges	0	231,000	1,325,000	759,000
Total impairment and abandonment charges	2,342,000	10,339,000	6,007,000	10,867,000
Operating Segments \| West
Real Estate Properties [Line Items]
Total impairment charges on projects in progress	0	2,236,000	1,174,000	2,236,000
Total impairment charges on land held for sale	1,028,000	845,000	1,073,000	845,000
Total abandonments charges	0	0	1,304,000	528,000
Operating Segments \| Southeast
Real Estate Properties [Line Items]
Total impairment charges on projects in progress	0	5,404,000	0	5,404,000
Total abandonments charges	0	231,000	0	231,000
Operating Segments \| East
Real Estate Properties [Line Items]
Total impairment charges on land held for sale	1,015,000	0	1,893,000	0
Total abandonments charges	0	0	21,000	0
Corporate and unallocated
Real Estate Properties [Line Items]
Total impairment charges on projects in progress	0	1,002,000	121,000	1,002,000
Total impairment charges on land held for sale	$ 299,000	$ 621,000	$ 421,000	$ 621,000