Inventory - Quantitative unobservable inputs for inventory impairment (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2016 USD ($) home	Jun. 30, 2016 USD ($) home
Quantitative unobservable inputs for inventory impairment [Line Items]
Discount Rate	14.15%
Minimum
Quantitative unobservable inputs for inventory impairment [Line Items]
Unobservable Inputs, Average Selling Price | $	$ 355	$ 355
Unobservable Inputs, Closings per Community per Month | home	2	2
Discount Rate		14.15%
Maximum
Quantitative unobservable inputs for inventory impairment [Line Items]
Unobservable Inputs, Average Selling Price | $	$ 560	$ 560
Unobservable Inputs, Closings per Community per Month | home	4	4
Discount Rate		15.33%