Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventory impairments and lot option abandonments	$ 0	$ 147,600	$ 168	$ 148,618	$ 168
Loss from discontinued operations, net of tax	(23)		(20)	(64)	(450)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	0		0	55	633
Home construction and land sales expenses	6		5	45	728
Inventory impairments and lot option abandonments	0		0	0	450
Gross (loss) profit	(6)		(5)	10	(545)
General and administrative expenses	23		27	90	74
Operating loss	(29)		(32)	(80)	(619)
Equity in income (loss) of unconsolidated entities	0		11	(1)	27
Other expense, net	(1)		(6)	(2)	(11)
Loss from discontinued operations before income taxes	(30)		(27)	(83)	(603)
Benefit from income taxes	(7)		(7)	(19)	(153)
Loss from discontinued operations, net of tax	$ (23)		$ (20)	$ (64)	$ (450)