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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Inventory Disclosure [Abstract]            
Homes under construction $ 462,017   $ 377,191      
Development projects in progress 772,664   742,417      
Land held for future development 152,724   213,006      
Land held for sale 25,585   29,696      
Capitalized interest 146,916 $ 144,299 138,108 $ 140,139 $ 132,462 $ 123,457
Model homes 71,166   68,861      
Total owned inventory $ 1,631,072   $ 1,569,279