Owned Inventory - Inventory Impairments and Abandonment Charges, by Reportable Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Real Estate Properties [Line Items]
Total impairment charges on land held for sale	$ 0	$ 0	$ 440,000	$ 0
Total abandonments charges	0	231,000	495,000	696,000
Total impairment and abandonment charges	0	231,000	935,000	696,000
West | Operating Segments
Real Estate Properties [Line Items]
Total impairment charges on land held for sale	0	0	440,000	0
Total abandonments charges	0	0	12,000	0
East | Operating Segments
Real Estate Properties [Line Items]
Total abandonments charges	0		0	465,000
Southeast | Operating Segments
Real Estate Properties [Line Items]
Total abandonments charges	$ 0	$ 231,000	$ 483,000	$ 231,000