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Basis of Presentation and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Disaggregation of Revenue [Line Items]          
Total revenue $ 565,339 $ 541,540 $ 1,034,292 $ 928,358  
Customer deposits 21,109   21,109   $ 18,669
Contract with customer, liability, revenue recognized 5,600   13,800    
Homebuilding revenue          
Disaggregation of Revenue [Line Items]          
Total revenue 556,032 538,636 1,016,454 919,555  
Land sales and other revenue          
Disaggregation of Revenue [Line Items]          
Total revenue $ 9,307 $ 2,904 $ 17,838 $ 8,803