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Commitments and Contingencies (Details Textuals) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Loss Contingency [Abstract]      
Liabilities for various claims, complaints and other legal actions $ 949.6 $ 858.9 $ 729.1
Construction defect portion of loss contingency accrual 97.00% 97.00%  
Expenses related to legal claims $ 164.0 $ 139.7 $ 138.0
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 156.8 165.8  
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 2,150.0    
Purchase Obligation 25,200.0    
Other Commitments [Abstract]      
Surety bonds 3,500.0    
Outstanding letters of credit 242.9    
Cash Deposits [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 2,030.0    
Promissory notes and letters of credit [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 126.8    
Forestar Group [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 193.3    
Purchase Obligation 1,900.0    
Increase (Decrease) in Earnest Money Deposits Outstanding 27.5 10.9  
Increase (Decrease) in Prepaid Expenses, Other 22.9 $ 21.8  
Other Commitments [Abstract]      
Outstanding letters of credit 32.8    
Option Contracts Subject to Specific Performance Clauses [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Purchase Obligation 226.3    
Option Contracts Subject to Specific Performance Clauses [Member] | Forestar Group [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Purchase Obligation $ 204.7