Inventory - Quantitative unobservable inputs for inventory impairment (Details) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2016 USD ($) home	Mar. 31, 2016 USD ($) home
Inventory Disclosure [Abstract]
Unobservable Inputs, Average Selling Price \| $	$ 409	$ 409
Unobservable Inputs, Closings per Community per Month \| home	2	2
Unobservable Inputs, Discount Rate	15.33%	15.33%

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration