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Inventory - Quantitative Unobservable Inputs (Details) (Details)
$ in Thousands
3 Months Ended
Dec. 31, 2018
USD ($)
home
Quantitative unobservable inputs for inventory impairment [Line Items]  
Average selling price | $ $ 412
Minimum  
Quantitative unobservable inputs for inventory impairment [Line Items]  
Closings per community per month 1
Maximum  
Quantitative unobservable inputs for inventory impairment [Line Items]  
Closings per community per month 2
Measurement Input, Discount Rate  
Quantitative unobservable inputs for inventory impairment [Line Items]  
Discount rate 0.168