Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Inventory impairments and lot option abandonments	$ 168	$ 470	$ 168	$ 752
(Loss) income from discontinued operations, net of tax	(20)	9	(450)	(101)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	0	0	633	0
Home construction and land sales expenses	5	(12)	728	72
Inventory impairments and lot option abandonments	0	0	450	0
Gross (loss) profit	(5)	12	(545)	(72)
General and administrative expenses	27	21	74	112
Operating loss	(32)	(9)	(619)	(184)
Equity in income of unconsolidated entities	11	20	27	20
Other expense, net	(6)	(4)	(11)	(7)
(Loss) income from discontinued operations before income taxes	(27)	7	(603)	(171)
Benefit from income taxes	(7)	(2)	(153)	(70)
(Loss) income from discontinued operations, net of tax	$ (20)	$ 9	$ (450)	$ (101)