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Commitments and Contingencies (Details Textuals) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Loss Contingency [Abstract]      
Liabilities for various claims, complaints and other legal actions $ 1,143.6 $ 949.6 $ 858.9
Construction defect portion of loss contingency accrual 98.00% 97.00%  
Expenses related to legal claims $ 240.1 $ 164.0 $ 139.7
Maximum amount deductible under workers compensation insurance policy 0.5    
Deductible policy amount per occurrence 0.5 0.5  
Estimated insurance recoveries related to legal claims 167.0 156.8  
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 2,330.0    
Purchase Obligation 26,000.0    
Other Commitments [Abstract]      
Surety bonds 3,500.0    
Outstanding letters of credit 282.3    
Cash Deposits [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 2,170.0    
Promissory notes and letters of credit [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 157.5    
Forestar Group [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 200.2    
Purchase Obligation 2,000.0    
Increase (Decrease) in Earnest Money Deposits Outstanding 20.6 27.5  
Increase (Decrease) in Prepaid Expenses, Other 26.5 $ 22.9  
Other Commitments [Abstract]      
Outstanding letters of credit 51.1    
Home Building Consolidated      
Other Commitments [Abstract]      
Outstanding letters of credit 231.2    
Option Contracts Subject to Specific Performance Clauses [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Purchase Obligation 99.7    
Option Contracts Subject to Specific Performance Clauses [Member] | Forestar Group [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Purchase Obligation $ 43.0