Owned Inventory - Inventory Impairments and Abandonment Charges, by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Real Estate Properties [Line Items]
Total impairment charges on land held for sale	$ 440	$ 0	$ 440	$ 0
Total abandonments charges	495	0	495	465
Total impairment and abandonment charges	935	0	935	465
West | Operating Segments
Real Estate Properties [Line Items]
Total impairment charges on land held for sale	440	0	440	0
Total abandonments charges	12	0	12	0
East | Operating Segments
Real Estate Properties [Line Items]
Total abandonments charges	0		0	465
Southeast | Operating Segments
Real Estate Properties [Line Items]
Total abandonments charges	$ 483	$ 0	$ 483	$ 0