Inventory - Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Real Estate, Write-down or Reserve [Line Items]
Impairment of inventory, land held for sale		$ 568
Inventory impairments and abandonments	$ 0	1,356
Continuing Operations
Real Estate, Write-down or Reserve [Line Items]
Abandonments		788
East Segment
Real Estate, Write-down or Reserve [Line Items]
Impairment of inventory, land held for sale		197
Southeast Segment
Real Estate, Write-down or Reserve [Line Items]
Impairment of inventory, land held for sale		371
Abandonments		$ 788