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Commitments and Contingencies (Details Textuals) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Loss Contingency [Abstract]      
Liabilities for various claims, complaints and other legal actions $ 729.1 $ 577.5 $ 473.8
Construction defect portion of loss contingency accrual 99.00% 99.00%  
Expenses related to legal claims $ 138.0 $ 72.4 $ 64.4
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 137.9 109.5  
Other Commitments [Abstract]      
Surety bonds 2,800.0    
Outstanding letters of credit 273.3    
Forestar Group [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 131.7    
Purchase Obligation 1,400.0    
Increase (Decrease) in Earnest Money Deposits Outstanding 8.7 30.8  
Increase (Decrease) in Prepaid Expenses, Other 58.9 $ 61.3  
Other Commitments [Abstract]      
Outstanding letters of credit 53.3    
Home Building      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 1,600.0    
Purchase Obligation 19,700.0    
Home Building | Cash Deposits [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 1,500.0    
Home Building | Promissory notes and letters of credit [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 90.5    
Option Contracts Subject to Specific Performance Clauses [Member] | Forestar Group [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Purchase Obligation 66.2    
Option Contracts Subject to Specific Performance Clauses [Member] | Home Building      
Land and Lot Option Purchase Contracts [Abstract]      
Purchase Obligation $ 88.9