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Inventory - Narrative (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2018
USD ($)
home
Community
Sep. 30, 2018
USD ($)
home
lot
Community
Sep. 30, 2018
USD ($)
home
Community
Sep. 30, 2018
USD ($)
home
Community
Sep. 30, 2017
USD ($)
home
Community
Sep. 30, 2016
USD ($)
Community
Real Estate [Abstract]            
Number of substantially completed homes not subject to a sales contract | home 240 240 240 240 171  
Total value of substantially completed homes | $ $ 84,800 $ 84,800 $ 84,800 $ 84,800 $ 52,600  
Threshold number of homes below a minimum threshold of profitability 10 10        
Number of communities on watch list 4 4 4 4 6  
Number of watch list communities requiring further analysis 2 2 2 2 2  
Impairment charge | $       $ 1,000 $ 1,693 $ 13,724
Number of Communities Impaired     1   1 3