Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventory impairments and lot option abandonments	$ 147,611	$ 0	$ 148,618	$ 0
Loss from discontinued operations, net of tax	(30)	(58)	(41)	(430)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	0	8	55	633
Home construction and land sales expenses	6	56	39	723
Inventory impairments and lot option abandonments	0	0	0	450
Gross (loss) profit	(6)	(48)	16	(540)
General and administrative expenses	34	31	67	47
Operating loss	(40)	(79)	(51)	(587)
Equity in income (loss) of unconsolidated entities	0	4	(1)	16
Other expense, net	0	(2)	(1)	(5)
Loss from discontinued operations before income taxes	(40)	(77)	(53)	(576)
Benefit from income taxes	(10)	(19)	(12)	(146)
Loss from discontinued operations, net of tax	$ (30)	$ (58)	$ (41)	$ (430)