Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of tax	$ (1)	$ (30)	$ (59)	$ (41)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	0	0	0	55
Home construction and land sales expenses	(16)	6	(15)	39
Gross profit (loss)	16	(6)	15	16
General and administrative expenses	16	34	90	67
Operating loss	0	(40)	(75)	(51)
Equity in loss of unconsolidated entities	0	0	0	(1)
Other expense, net	(1)	0	(1)	(1)
Loss from discontinued operations before income taxes	(1)	(40)	(76)	(53)
Benefit from income taxes	0	(10)	(17)	(12)
Loss from discontinued operations, net of tax	$ (1)	$ (30)	$ (59)	$ (41)