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Notes Payable - Homebuilding Textuals (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2023
Sep. 30, 2022
Debt Instrument [Line Items]        
Letters of credit, amount outstanding $ 254.3   $ 254.3  
Percentage of Company Assets Owned by Entities that Guarantee Homebuilding Senior Notes and Revolving Credit Facility 76.00%   76.00%  
Home Building Consolidated        
Debt Instrument [Line Items]        
Line of credit, current borrowing capacity $ 2,190.0   $ 2,190.0  
Line of credit, maximum borrowing capacity $ 3,000.0   $ 3,000.0  
Letter of Credit, Maximum Borrowing Capacity 100.00%   100.00%  
Line of credit, amount outstanding $ 0.0   $ 0.0 $ 0.0
Letters of credit, amount outstanding 226.6   226.6  
Line of Credit Facility, Remaining Borrowing Capacity 1,960.0   1,960.0  
Authorized Repurchase Of Debt Securities 500.0   500.0  
Debt Repurchase Authorization Remaining $ 500.0   $ 500.0  
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 Twenty Seven [Member]        
Debt Instrument [Line Items]        
Senior notes, stated interest rate 4.75%   4.75%  
Maturities of Senior Debt   $ 300.0    
Home Building Consolidated | SeniorNoteTwentyEight [Member]        
Debt Instrument [Line Items]        
Senior notes, stated interest rate 5.75%   5.75%  
Maturities of Senior Debt $ 400.0      
Debt Instrument, Redemption Price, Percentage 100.00%