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Notes Payable (Narratives) (Details) - USD ($)
3 Months Ended 6 Months Ended
May 31, 2021
May 31, 2021
Jun. 09, 2021
Nov. 30, 2020
Debt Instrument [Line Items]        
Unamortized debt issuance costs, premiums and discounts $ 6,600,000 $ 6,600,000   $ 7,500,000
Letters of credit outstanding 54,800,000 54,800,000   42,100,000
Inventories pledged to collateralize mortgages and land contracts, carrying value 13,200,000 13,200,000    
Repayments of principal, 2019 1,100,000 1,100,000    
Repayments of principal, 2020 801,100,000 801,100,000    
Repayments of principal, 2021 351,200,000 351,200,000    
Repayments of principal, 2022 700,000 700,000    
Repayments of principal, thereafter 600,000,000.0 600,000,000.0    
Repayments of principal, 2023 $ 0 $ 0    
6.875% Senior notes due June 15, 2027 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes, rate 6.875% 6.875%    
7.625% Senior notes due May 15, 2023 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes, rate 7.625% 7.625%    
7.00% Senior notes due December 15, 2021 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes, rate 7.00% 7.00%    
Debt Instrument, Face Amount $ 450,000,000.0 $ 450,000,000.0    
Senior Notes Due Two Thousand Thirty One At Four Point Zero Zero Percent | Senior Notes [Member] | Subsequent Event [Member]        
Debt Instrument [Line Items]        
Senior notes, rate     4.00%  
Debt Instrument, Face Amount     $ 390,000,000.0  
Conversion Price Premium     100.00%  
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Unsecured revolving credit facility, borrowing capacity $ 800,000,000.0 800,000,000.0    
Unsecured revolving credit facility, expiration date Oct. 07, 2023      
Unsecured revolving credit facility, maximum borrowing capacity $ 1,000,000,000.00 1,000,000,000.00    
Credit facility, letters of credit outstanding 0 0    
Unsecured revolving credit facility, remaining borrowing capacity 787,600,000 $ 787,600,000    
Revolving Credit Facility [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.20%    
Revolving Credit Facility [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.35%    
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Unsecured revolving credit facility, maximum borrowing capacity 250,000,000.0 $ 250,000,000.0    
Credit facility, letters of credit outstanding 12,400,000 12,400,000    
Unsecured revolving credit facility, remaining borrowing capacity 237,600,000 237,600,000    
LOC Facilities [Member]        
Debt Instrument [Line Items]        
Unsecured revolving credit facility, borrowing capacity 50,000,000.0 50,000,000.0    
Letters of credit outstanding $ 42,400,000 $ 42,400,000   $ 29,700,000