v3.26.1
Notes Payable - Forestar Textuals (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2026
Sep. 30, 2025
Debt Instrument [Line Items]        
Letters of Credit Outstanding, Amount $ 262.7   $ 262.7  
Forestar Group [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity 715.0   715.0  
Line of Credit Facility, Maximum Borrowing Capacity 1,000.0   1,000.0  
Letter of Credit, Maximum Borrowing Capacity (in dollars) $ 100.0   $ 100.0  
Letters of credit, sublimit borrowing capacity, as a percentage 50.00%   50.00%  
Borrowings outstanding on revolving credit facility $ 0.0   $ 0.0 $ 0.0
Letters of Credit Outstanding, Amount 42.9   42.9  
Line of Credit Facility, Remaining Borrowing Capacity 672.1   672.1  
Authorized Repurchase Of Debt Securities 30.0   30.0  
Debt Repurchase Authorization Remaining 30.0   30.0  
Forestar Group [Member] | Credit Facility Maturing October 28, 2026        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity 65.0   $ 65.0  
Line of Credit Facility, Expiration Date     Oct. 28, 2026  
Forestar Group [Member] | Credit Facility Maturing December 18, 2029        
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity 650.0   $ 650.0  
Line of Credit Facility, Expiration Date     Dec. 18, 2029  
Line of Credit Facility, Increase (Decrease), Net $ 50.0 $ 25.0