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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Inventory Disclosure [Abstract]        
Homes under construction $ 478,539 $ 476,752    
Development projects in progress 925,728 907,793    
Land held for future development 83,177 83,173    
Land held for sale 6,997 7,781    
Capitalized interest 151,886 144,645 $ 144,847 $ 139,203
Model homes 75,793 72,140    
Total owned inventory $ 1,722,120 $ 1,692,284