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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Inventory Disclosure [Abstract]        
Homes under construction $ 461,185 $ 419,312    
Development projects in progress 830,827 785,777    
Land held for future development 97,166 112,565    
Land held for sale 19,258 17,759    
Capitalized interest 144,847 139,203 $ 144,299 $ 138,108
Model homes 73,438 68,191    
Total owned inventory $ 1,626,721 $ 1,542,807