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Inventory - Schedule of Discounted Cash Flow Analysis (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2016
USD ($)
lot
Community
Jun. 30, 2016
USD ($)
lot
Community
Real Estate, Write-down or Reserve [Line Items]    
Number of Communities Impaired | Community 2 3
Number of Lots Impaired | lot 257 291
Impairment Charge $ 11,899 $ 13,724
Estimated Fair Value of Impaired Inventory at Period End $ 28,900 $ 34,418
Corporate and unallocated    
Real Estate, Write-down or Reserve [Line Items]    
Number of Communities Impaired | Community 0 0
Number of Lots Impaired | lot 0 0
Impairment Charge $ 789 $ 1,101
Estimated Fair Value of Impaired Inventory at Period End $ 0 $ 0
West Segment    
Real Estate, Write-down or Reserve [Line Items]    
Number of Communities Impaired | Community 1 2
Number of Lots Impaired | lot 179 213
Impairment Charge $ 5,216 $ 6,729
Estimated Fair Value of Impaired Inventory at Period End $ 10,827 $ 16,345
East Segment    
Real Estate, Write-down or Reserve [Line Items]    
Number of Communities Impaired | Community 1 1
Number of Lots Impaired | lot 78 78
Impairment Charge $ 5,894 $ 5,894
Estimated Fair Value of Impaired Inventory at Period End $ 18,073 $ 18,073