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Owned Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Inventory Disclosure [Abstract]        
Homes under construction $ 726,379 $ 648,283    
Land under development 646,161 648,404    
Land held for future development 19,879 19,879    
Land held for sale 10,822 9,179    
Capitalized interest 110,516 106,985 $ 119,148 $ 119,659
Model homes 68,044 68,872    
Total owned inventory $ 1,581,801 $ 1,501,602