Discontinued Operations - Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of tax	$ (372)	$ (70)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenue	625	0
Home construction and land sales expenses	667	78
Inventory impairments and lot option abandonments	450	0
Gross loss	(492)	(78)
General and administrative expenses	16	31
Operating loss	(508)	(109)
Equity in income of unconsolidated entities	12	0
Other expense, net	(3)	0
Loss from discontinued operations before income taxes	(499)	(109)
Benefit from income taxes	(127)	(39)
Loss from discontinued operations, net of tax	$ (372)	$ (70)