Owned Inventory - Inventory Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	$ 1,900,000	$ 0	$ 1,300,000
Abandonments	1,095,000	853,000	1,646,000
Total impairments and abandonment charges	2,963,000	853,000	2,903,000
West | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Abandonments	289,000	0	923,000
East | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Abandonments	143,000	465,000	82,000
Southeast | Operating Segments
Real Estate, Write-down or Reserve [Line Items]
Abandonments	663,000	388,000	641,000
Continuing Operations
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	1,868,000	0	1,257,000
Continuing Operations | Corporate and unallocated
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	565,000	0	1,160,000
Continuing Operations | West
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	1,303,000	0	89,000
Continuing Operations | Southeast
Real Estate, Write-down or Reserve [Line Items]
Land held for sale	$ 0	$ 0	$ 8,000