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Basis of Presentation (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
USD ($)
lot
Dec. 31, 2022
USD ($)
lot
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Entity Information [Line Items]        
Payments related to business acquisitions | $     $ 202.0 $ 271.5
Riggins Custom Homes        
Entity Information [Line Items]        
Payments related to business acquisitions | $   $ 107.0    
Business Acquisition, Number of Homes Acquired   170    
Business Acquisition, Number of Finished Lots Acquired   3,000    
Business Acquisition, Backlog Acquired   100    
Truland Homes        
Entity Information [Line Items]        
Payments related to business acquisitions | $ $ 100.0      
Business Acquisition, Number of Homes Acquired 155      
Business Acquisition, Number of Finished Lots Acquired 620      
Business Acquisition, Backlog Acquired 55      
Business Acquisition, Number of Controlled Lots Acquired through Land Purchase 660      
Forestar Group [Member]        
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Noncontrolling Interest, Ownership Percentage by Parent 63.00%   63.00%  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 37.00%   37.00%  
Entity Information [Line Items]        
Noncontrolling Interest, Ownership Percentage by Parent 63.00%   63.00%  
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 37.00%   37.00%