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Notes Payable - Homebuilding Textuals (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2019
Debt Instrument [Line Items]      
Letters of credit, amount outstanding $ 273.3    
Percentage of Company Assets Owned by Entities that Guarantee Homebuilding Senior Notes and Revolving Credit Facility 76.00%    
Home Building Consolidated      
Debt Instrument [Line Items]      
Line of credit, current borrowing capacity $ 2,190.0    
Line of credit, maximum borrowing capacity $ 3,000.0    
Letter of Credit, Maximum Borrowing Capacity 100.00%    
Line of credit, amount outstanding $ 0.0 $ 0.0  
Letters of credit, amount outstanding 220.0    
Line of Credit Facility, Remaining Borrowing Capacity 1,970.0    
Authorized Repurchase Of Debt Securities     $ 500.0
Debt Repurchase Authorization Remaining 500.0    
Proceeds from Lines of Credit 3,450.0    
Repayments of Lines of Credit 3,450.0    
Home Building Consolidated | SeniorNoteFortyTwo [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 500.0    
Senior notes, stated interest rate 2.50%    
Debt Instrument, Maturity Date Oct. 15, 2024    
Debt Instrument, Interest Rate, Effective Percentage 2.70%    
Home Building Consolidated | Senior Notes Subject to Repurchase Upon Change of Control and Ratings Downgrade [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Redemption Price, Percentage 101.00%    
Home Building Consolidated | Senior Note Member Twenty Five [Member]      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 4.375%    
Maturities of Senior Debt $ 350.0