Inventory - Narrative (Details)	3 Months Ended
	Dec. 31, 2015 USD ($) home property	Dec. 31, 2014 USD ($) property	Sep. 30, 2015 USD ($) home
Real Estate Properties [Line Items]
Discounted Cash Flow Analyses, Number of Lots Impaired | property	0
Number of substantially completed homes unsold | home	172		128
Total value of substantially completed homes	$ 48,700,000		$ 40,100,000
Number of Communities on Watch List	0	2
Inventory Impairment, Results of Discounted Cash Flow Analysis	$ 0
Inventory Impairment and Abandonment	$ 1,356,000	$ 0
Discontinued Operations | East Segment
Real Estate Properties [Line Items]
Threshold Number of Homes Below a Minimum Threshold of Profitability | home	10