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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Inventory Disclosure [Abstract]        
Homes under construction $ 625,296 $ 525,021    
Development projects in progress 563,285 589,763    
Land held for future development 23,068 28,531    
Land held for sale 10,045 12,622    
Capitalized interest 119,148 119,659 $ 137,010 $ 136,565
Model homes 73,148 75,142    
Total owned inventory $ 1,413,990 $ 1,350,738