Inventory - Schedule of Discounted Cash Flow Analysis (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016 USD ($) lot Community	Mar. 31, 2015 property	Mar. 31, 2016 USD ($) lot Community
Real Estate, Write-down or Reserve [Line Items]
Discounted Cash Flow Analyses, Number of Impaired Communities	1	1	1
Number of Lots Impaired | lot	34		34
Impairment Charge	$ 1,825		$ 1,825
Estimated Fair Value of Impaired Inventory at Period End	$ 5,518		$ 5,518
West Segment
Real Estate, Write-down or Reserve [Line Items]
Discounted Cash Flow Analyses, Number of Impaired Communities | Community	1		1
Number of Lots Impaired | lot	34		34
Impairment Charge	$ 1,513		$ 1,513
Estimated Fair Value of Impaired Inventory at Period End	$ 5,518		$ 5,518
Corporate and unallocated
Real Estate, Write-down or Reserve [Line Items]
Discounted Cash Flow Analyses, Number of Impaired Communities | Community	0		0
Number of Lots Impaired | lot	0		0
Impairment Charge	$ 312		$ 312
Estimated Fair Value of Impaired Inventory at Period End	$ 0		$ 0