Owned Inventory - Inventory Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	$ 0	$ 1,868,000	$ 0
Abandonments	641,000	1,095,000	853,000
Total impairment and abandonment charges	641,000	2,963,000	853,000
Corporate and unallocated
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	0	565,000	0
West | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	0	1,303,000	0
Abandonments	487,000	289,000	0
East | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Abandonments	154,000	143,000	465,000
Southeast | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Abandonments	$ 0	$ 663,000	$ 388,000