Owned Inventory - Inventory Impairments and Abandonment Charges, by Reportable Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Real Estate Properties [Line Items]
Total impairment charges on land held for sale	$ 0	$ 0	$ 0	$ 440,000
Total abandonments charges	315,000	0	616,000	495,000
Total impairments and abandonment charges	315,000	0	616,000	935,000
West | Operating Segments
Real Estate Properties [Line Items]
Total impairment charges on land held for sale	0	0	0	440,000
Total abandonments charges	315,000	0	462,000	12,000
East | Operating Segments
Real Estate Properties [Line Items]
Total abandonments charges	0	0	154,000	0
Southeast | Operating Segments
Real Estate Properties [Line Items]
Total abandonments charges	$ 0	$ 0	$ 0	$ 483,000