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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Inventory Disclosure [Abstract]            
Homes under construction $ 653,137   $ 525,021      
Development projects in progress 517,037   589,763      
Land held for future development 23,068   28,531      
Land held for sale 8,851   12,622      
Capitalized interest 113,414 $ 119,148 119,659 $ 134,693 $ 137,010 $ 136,565
Model homes 68,109   75,142      
Total owned inventory $ 1,383,616   $ 1,350,738