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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Inventory Disclosure [Abstract]            
Homes under construction $ 641,780   $ 419,312      
Development projects in progress 805,619   785,777      
Land held for future development 84,813   112,565      
Land held for sale 10,128   17,759      
Capitalized interest 152,182 $ 149,034 139,203 $ 148,330 $ 146,916 $ 138,108
Model homes 73,461   68,191      
Total owned inventory $ 1,767,983   $ 1,542,807