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Notes Payable (Narratives) (Details)
3 Months Ended 9 Months Ended
Jun. 15, 2018
USD ($)
Aug. 31, 2018
USD ($)
$ / shares
shares
Aug. 31, 2017
shares
Aug. 31, 2018
USD ($)
$ / shares
shares
Aug. 31, 2017
USD ($)
shares
Nov. 30, 2017
USD ($)
Debt Instrument [Line Items]            
Debt Issuance Costs, Net   $ 11,200,000   $ 11,200,000   $ 15,400,000
Line of Credit Facility, Current Borrowing Capacity   500,000,000   500,000,000    
Letters of credit outstanding   $ 37,700,000   $ 37,700,000   37,600,000
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities (in shares) | shares   8,402,000 8,402,000 8,402,000 8,402,000  
Gain (Loss) on Extinguishment of Debt       $ 0 $ (5,685,000)  
Notes and Loans Payable   $ 2,063,127,000   2,063,127,000   2,324,845,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   0   0    
Long-term Debt, Maturities, Repayments of Principal in Year Two   674,300,000   674,300,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three   350,000,000   350,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four   0   0    
Long-term Debt, Maturities, Repayments of Principal in Year Five   800,000,000   800,000,000    
Long-term Debt, Maturities, Repayments of Principal after Year Five   250,000,000   250,000,000    
Inventories pledged to collateralize mortgages and land contracts, carrying value   $ 145,700,000   145,700,000    
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Unsecured revolving credit facility, expiration date   Jul. 27, 2021        
Unsecured revolving credit facility, maximum borrowing capacity   $ 600,000,000.0   600,000,000.0    
Line of Credit Facility, Amount Outstanding   0   0    
Unsecured revolving credit facility, remaining borrowing capacity   $ 462,300,000   462,300,000    
Revolving Credit Facility [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Line of credit facility, unused capacity, commitment fee percentage   0.30%        
Revolving Credit Facility [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Line of credit facility, unused capacity, commitment fee percentage   0.45%        
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Unsecured revolving credit facility, maximum borrowing capacity   $ 250,000,000.0   250,000,000.0    
Line of Credit Facility, Amount Outstanding   37,700,000   37,700,000    
Unsecured revolving credit facility, remaining borrowing capacity   212,300,000   212,300,000    
LOC Facilities [Member]            
Debt Instrument [Line Items]            
Letters of credit outstanding   0   0   0
Mortgages and Land Contracts Due to Land Sellers and Other Loans [Member]            
Debt Instrument [Line Items]            
Notes and Loans Payable   $ 44,295,000   $ 44,295,000   $ 10,203,000
Convertible Notes Payable [Member] | Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member]            
Debt Instrument [Line Items]            
Senior notes, rate   1.375%   1.375%   1.375%
Debt instrument, conversion ratio   0.0365297        
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares   $ 27.37   $ 27.37    
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities (in shares) | shares   8,401,831        
Notes and Loans Payable   $ 229,482,000   $ 229,482,000   $ 228,572,000
Senior Notes [Member] | Senior notes due June 15, 2018 at 7 1/4%            
Debt Instrument [Line Items]            
Senior notes, rate           7.25%
Extinguishment of Debt, Amount $ 300,000,000          
Notes and Loans Payable   $ 0   $ 0   $ 299,867,000
Senior Notes [Member] | Senior Notes Due Two Thousand Nineteen at Four Point Seven Five Percent [Member]            
Debt Instrument [Line Items]            
Senior notes, rate   4.75%   4.75%   4.75%
Notes and Loans Payable   $ 399,207,000   $ 399,207,000   $ 398,397,000
Senior Notes [Member] | Senior notes due March 15, 2020 at 8.00%            
Debt Instrument [Line Items]            
Senior notes, rate   8.00%   8.00%   8.00%
Notes and Loans Payable   $ 347,390,000   $ 347,390,000   $ 346,238,000
Senior Notes [Member] | Senior notes due September 15, 2022 at 7.50%            
Debt Instrument [Line Items]            
Senior notes, rate   7.50%   7.50%   7.50%
Notes and Loans Payable   $ 347,603,000   $ 347,603,000   $ 347,234,000
Senior Notes [Member] | Senior Notes Due Two Thousand Twenty Three At Seven Point Six Two Five Percent [Domain]            
Debt Instrument [Line Items]            
Senior notes, rate   7.625%   7.625%   7.625%
Notes and Loans Payable   $ 247,984,000   $ 247,984,000   $ 247,726,000