Inventory - Results of Discounted Cash Flow Analysis (Details) (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2018 USD ($) lot Community	Dec. 31, 2017 USD ($)
Real Estate, Write-down or Reserve [Line Items]
Number of Communities Impaired | Community	1
Number of Lots Impaired | lot	15
Impairment Charge	$ 1,007	$ 500
Estimated Fair Value of Impaired Inventory at time of Impairment	$ 1,605
Continuing Operations | Southeast Segment
Real Estate, Write-down or Reserve [Line Items]
Number of Communities Impaired | Community	1
Number of Lots Impaired | lot	15
Impairment Charge	$ 858
Estimated Fair Value of Impaired Inventory at time of Impairment	$ 1,367
Corporate and unallocated | Continuing Operations
Real Estate, Write-down or Reserve [Line Items]
Number of Communities Impaired | Community	0
Number of Lots Impaired | lot	0
Impairment Charge	$ 149
Estimated Fair Value of Impaired Inventory at time of Impairment	$ 238