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Commitments and Contingencies (Details Textuals) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Loss Contingency [Abstract]      
Liabilities for various claims, complaints and other legal actions $ 577.5 $ 473.8 $ 434.7
Construction defect portion of loss contingency accrual 99.00% 99.00%  
Expenses related to legal claims $ 72.4 $ 64.4 $ 15.3
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 109.5 81.2  
Other Commitments [Abstract]      
Surety bonds 2,300.0    
Outstanding letters of credit 247.4    
Forestar Consolidated [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 151.0    
Purchase Obligation 1,600.0    
Other Commitments [Abstract]      
Outstanding letters of credit 60.3    
Forestar Group [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Increase (Decrease) in Earnest Money Deposits Outstanding 30.8 27.0  
Increase (Decrease) in Prepaid Expenses, Other 61.3 $ 36.3  
Home Building Consolidated      
Other Commitments [Abstract]      
Outstanding letters of credit 187.1    
Home Building      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 1,100.0    
Purchase Obligation 15,500.0    
Home Building | Cash Deposits [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 989.3    
Home Building | Promissory notes and letters of credit [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Deposits 79.8    
Option Contracts Subject to Specific Performance Clauses [Member] | Forestar Consolidated [Member]      
Land and Lot Option Purchase Contracts [Abstract]      
Purchase Obligation 67.8    
Option Contracts Subject to Specific Performance Clauses [Member] | Home Building      
Land and Lot Option Purchase Contracts [Abstract]      
Purchase Obligation $ 100.0