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Owned Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Inventory Disclosure [Abstract]            
Homes under construction $ 838,139   $ 648,283      
Land under development 619,385   648,404      
Land held for future development 19,879   19,879      
Land held for sale 14,167   9,179      
Capitalized interest 112,686 $ 110,516 106,985 $ 113,414 $ 119,148 $ 119,659
Model homes 72,716   68,872      
Total owned inventory $ 1,676,972   $ 1,501,602