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Inventory Inventory - Quantitative Unobservable Inputs (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 USD ($) home | Sep. 30, 2016 USD ($) home
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Average selling price (in thousands) (a) | $ 405 |
Discount rate | 12.83% |
Minimum |  |
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Average selling price (in thousands) (a) |  | $ 355
Closings per community per month | home | 1 | 2
Discount rate |  | 14.15%
Maximum |  |
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Average selling price (in thousands) (a) |  | $ 560
Closings per community per month | home | 4 | 4
Discount rate |  | 15.33%

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- Definition Fair Value Inputs, Average Selling Price + References No definition available. + Details
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- Definition [Line Items] for Quantitative unobservable inputs for inventory impairment [Table] + References No definition available. + Details
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- Definition 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. + References 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 + Details
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