Inventory - Results of Discounted Cash Flow Analysis (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019 USD ($) lot Community	Mar. 31, 2019 USD ($) lot Community
Real Estate, Write-down or Reserve [Line Items]
Number of Communities Impaired | Community	9	10
Number of Lots Impaired | lot	839	854
Impairment Charge	$ 109,023	$ 110,030
Estimated Fair Value of Impaired Inventory at time of Impairment	$ 83,377	$ 84,982
Continuing Operations | West Segment
Real Estate, Write-down or Reserve [Line Items]
Number of Communities Impaired | Community	9	9
Number of Lots Impaired | lot	839	839
Impairment Charge	$ 92,912	$ 92,912
Estimated Fair Value of Impaired Inventory at time of Impairment	$ 69,449	$ 69,449
Continuing Operations | Southeast Segment
Real Estate, Write-down or Reserve [Line Items]
Number of Communities Impaired | Community	0	1
Number of Lots Impaired | lot	0	15
Impairment Charge	$ 0	$ 858
Estimated Fair Value of Impaired Inventory at time of Impairment	$ 0	$ 1,367
Corporate and unallocated | Continuing Operations
Real Estate, Write-down or Reserve [Line Items]
Number of Communities Impaired | Community	0	0
Number of Lots Impaired | lot	0	0
Impairment Charge	$ 16,111	$ 16,260
Estimated Fair Value of Impaired Inventory at time of Impairment	$ 13,928	$ 14,166