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Notes Payable (Narratives) (Details) - USD ($)
3 Months Ended 6 Months Ended
May 31, 2020
May 31, 2020
May 31, 2019
Nov. 30, 2019
Feb. 01, 2019
Debt Instrument [Line Items]          
Unamortized debt issuance costs, premiums and discounts $ 8,300,000 $ 8,300,000   $ 9,100,000  
Letters of credit outstanding 45,900,000 45,900,000   34,700,000  
Inventories pledged to collateralize mortgages and land contracts, carrying value 52,100,000 52,100,000      
Repayment of senior notes   0 $ 630,000,000    
Proceeds from issuance of debt   0 $ 405,250,000    
Repayments of principal, 2019 6,800,000 6,800,000      
Repayments of principal, 2020 18,000,000.0 18,000,000.0      
Repayments of principal, 2021 800,000,000.0 800,000,000.0      
Repayments of principal, 2022 350,000,000.0 350,000,000.0      
Repayments of principal, 2023 0 0      
Repayments of principal, thereafter $ 600,000,000.0 $ 600,000,000.0      
1.375% Convertible senior notes due February 1, 2019 [Member] | Convertible Notes Payable [Member]          
Debt Instrument [Line Items]          
Senior notes, rate         1.375%
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%      
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 $ 33,500,000 $ 33,500,000   $ 15,800,000