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Commitments and Contingencies (Details Textuals) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Loss Contingency [Abstract]      
Liabilities for various claims, complaints and other legal actions $ 858.9 $ 729.1 $ 577.5
Construction defect portion of loss contingency accrual 97.00% 99.00%  
Expenses related to legal claims $ 139.7 $ 138.0 $ 72.4
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 165.8 137.9  
Other Commitments [Abstract]      
Surety bonds 3,200.0    
Outstanding letters of credit 254.3    
Forestar Group [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 139.1    
Purchase Obligation 1,300.0    
Increase (Decrease) in Earnest Money Deposits Outstanding 10.9 8.7  
Increase (Decrease) in Prepaid Expenses, Other 21.8 $ 58.9  
Other Commitments [Abstract]      
Outstanding letters of credit 27.7    
Home Building      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 1,800.0    
Purchase Obligation 21,100.0    
Home Building | Cash Deposits [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 1,700.0    
Home Building | Promissory notes and letters of credit [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 119.4    
Option Contracts Subject to Specific Performance Clauses [Member] | Forestar Group [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Purchase Obligation 183.0    
Option Contracts Subject to Specific Performance Clauses [Member] | Home Building      
Land and Lot Option Purchase Contracts [Abstract]      
Purchase Obligation $ 226.3