Inventory - Narrative (Details) $ in Millions	3 Months Ended
	Jun. 30, 2015 USD ($) home property	Jun. 30, 2014 property	Sep. 30, 2014 USD ($) home
Real Estate Properties [Line Items]
Discounted Cash Flow Analyses, Number of Lots Impaired | property	0	2
Number of substantially completed homes unsold	98		205
Total value of substantially completed homes | $	$ 29.0		$ 48.0
Threshold number of homes below a minimum threshold of profitability	10
Number of Communities on Watch List	0	4
Southeast Segment
Real Estate Properties [Line Items]
Number of Communities on Watch List | property		1