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Homebuilding Senior Notes and Other Debts Payable (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2025
May 30, 2025
Aug. 31, 2025
Feb. 28, 2025
Aug. 31, 2025
Aug. 31, 2024
Nov. 30, 2024
Debt Instrument [Line Items]              
Redemption of senior notes         $ 500,000,000 $ 553,865,000  
Proceeds from issuance of senior notes         700,000,000 $ 0  
Unsecured revolving credit facility | Delayed Draw Term Loan Facility              
Debt Instrument [Line Items]              
Maximum borrowings $ 1,700,000,000   $ 1,600,000,000   1,600,000,000    
Increase in borrowing capacity $ 100,000,000            
Line of Credit Facility, Accordion Feature     500,000,000   500,000,000    
Homebuilding | Letter of Credit              
Debt Instrument [Line Items]              
Maximum borrowings     477,500,000   477,500,000    
Homebuilding | Unsecured revolving credit facility              
Debt Instrument [Line Items]              
Maximum borrowings     3,125,000,000   3,125,000,000    
Homebuilding | Unsecured revolving credit facility | Commitments - maturing in November 2029              
Debt Instrument [Line Items]              
Maximum borrowings     2,900,000,000   2,900,000,000    
Increase in borrowing capacity     100,000,000 $ 150,000,000      
Homebuilding | Senior Notes              
Debt Instrument [Line Items]              
Debt issuance cost     $ 7,500,000   $ 7,500,000   $ 2,400,000
Homebuilding | Senior Notes | 5.20% senior notes due 2030              
Debt Instrument [Line Items]              
Interest rate (percent)     5.20%   5.20%    
Homebuilding | Senior Notes | 2030 Senior Notes              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 700,000,000          
Interest rate (percent)   5.20%          
Principal discount rate   99.969%          
Proceeds from issuance of senior notes   $ 695,600,000          
Homebuilding | Senior Notes | 4.75% senior notes due 2025              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 500,000,000          
Interest rate (percent)     4.75%   4.75%