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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Commitments and Contingencies [Abstract]        
Earnest money deposits $ 2,300.0   $ 2,300.0  
Remaining purchase price of land under option contracts 25,700.0   25,700.0  
Surety bonds 3,400.0   3,400.0  
Outstanding letters of credit 281.5   281.5  
Option Contracts Subject to Specific Performance Clauses [Member]        
Commitments and Contingencies [Abstract]        
Remaining purchase price of land under option contracts 206.7   206.7  
Cash [Member]        
Commitments and Contingencies [Abstract]        
Earnest money deposits 2,100.0   2,100.0  
Notes Payable, Other Payables [Member]        
Commitments and Contingencies [Abstract]        
Earnest money deposits 154.9   154.9  
Home Building Consolidated        
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 244.3   244.3  
Forestar Group [Member]        
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 37.2   37.2  
Forestar Group [Member]        
Commitments and Contingencies [Abstract]        
Earnest money deposits 223.2   223.2  
Remaining purchase price of land under option contracts 2,200.0   2,200.0  
Increase (Decrease) in Earnest Money Deposits Outstanding 4.2 $ 4.0 18.8 $ 22.7
Increase (Decrease) in Prepaid Expenses, Other 9.5 $ 4.4 17.7 $ 15.1
Forestar Group [Member] | Option Contracts Subject to Specific Performance Clauses [Member]        
Commitments and Contingencies [Abstract]        
Remaining purchase price of land under option contracts $ 169.2   $ 169.2