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Notes Payable (Narratives) (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 09, 2021
Aug. 31, 2021
May 31, 2021
Aug. 31, 2021
Aug. 31, 2020
Sep. 15, 2021
Aug. 11, 2021
Nov. 30, 2020
Debt Instrument [Line Items]                
Unamortized debt issuance costs, premiums and discounts   $ 10,700,000   $ 10,700,000       $ 7,500,000
Letters of credit outstanding   43,600,000   43,600,000       42,100,000
Inventories pledged to collateralize mortgages and land contracts, carrying value   16,600,000   16,600,000        
Repayment of senior notes       274,904,000 $ 0      
Proceeds from issuance of debt       390,000,000 0      
Repayments of principal, 2019   1,100,000   1,100,000        
Repayments of principal, 2020   531,300,000   531,300,000        
Repayments of principal, 2021   351,200,000   351,200,000        
Repayments of principal, 2022   700,000   700,000        
Repayments of principal, thereafter   990,000,000   990,000,000        
Repayments of principal, 2023   $ 0   0        
Proceeds from (Repayments of) Notes Payable $ 274,900,000              
Loss on early extinguishment of debt 5,100,000     $ 5,075,000 $ 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, Repurchased Face Amount $ 269,800,000              
Debt Instrument, Face Amount   $ 450,000,000   $ 450,000,000        
Senior Notes Due Two Thousand Thirty One At Four Point Zero Zero Percent | Senior Notes [Member]                
Debt Instrument [Line Items]                
Senior notes, rate 4.00% 4.00%   4.00%        
Debt Instrument, Face Amount $ 390,000,000              
Conversion Price Premium 100.00%              
Proceeds from Issuance of Debt $ 385,200,000              
Senior Notes Due Two Thousand Twenty Nine At Four Point Eight Percent | Senior Notes [Member]                
Debt Instrument [Line Items]                
Senior notes, rate   4.80%   4.80%        
Senior Notes Due September Two Thousand Twenty One At Seven Point Zero Zero Percent | Senior Notes [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Senior notes, rate           7.00%    
Debt Instrument, Face Amount           $ 180,200,000    
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Unsecured revolving credit facility, borrowing capacity   $ 800,000,000   $ 800,000,000        
Unsecured revolving credit facility, expiration date   Oct. 07, 2023            
Unsecured revolving credit facility, maximum borrowing capacity   $ 1,000,000,000   1,000,000,000        
Credit facility, letters of credit outstanding   0   0        
Unsecured revolving credit facility, remaining borrowing capacity   791,400,000   $ 791,400,000        
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   $ 250,000,000        
Credit facility, letters of credit outstanding   8,600,000   8,600,000        
Unsecured revolving credit facility, remaining borrowing capacity   241,400,000   241,400,000        
LOC Facilities [Member]                
Debt Instrument [Line Items]                
Unsecured revolving credit facility, borrowing capacity   $ 75,000,000   75,000,000     $ 50,000,000  
Unsecured revolving credit facility, expiration date   Feb. 13, 2025 Feb. 13, 2022          
Letters of credit outstanding   $ 35,000,000   $ 35,000,000       $ 29,700,000