Owned Inventory - Inventory Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) - USD ($)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	$ 0	$ 0	$ 1,868,000
Abandonments	1,996,000	641,000	1,095,000
Total impairment and abandonment charges	1,996,000	641,000	2,963,000
Corporate and unallocated
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	0	0	565,000
West | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	0	0	1,303,000
Abandonments	1,805,000	487,000	289,000
East | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Abandonments	91,000	154,000	143,000
Southeast | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Abandonments	$ 100,000	$ 0	$ 663,000