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Inventory Inventory - Quantitative Unobservable Inputs (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 USD ($) home | Sep. 30, 2018 USD ($) numberOfContract
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Average selling price (in thousands) |  | $ 356
Discount rate |  | 0.151
Minimum |  |
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Average selling price (in thousands) | $ 350 |
Closings per community per month | 1 | 1
Maximum |  |
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Average selling price (in thousands) | $ 615 |
Closings per community per month | 4 | 6
Discount Rate | Minimum |  |
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Discount rate | 0.147 |
Discount Rate | Maximum |  |
Quantitative unobservable inputs for inventory impairment [Line Items] |  |
Discount rate | 0.168 |

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- Definition Fair Value Inputs, Closings per community per month + 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 Value of input used to measure alternative investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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