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Notes Payable (Narratives) (Details)
 3 Months Ended 6 Months Ended
Jan. 13, 2017
USD ($)
May 31, 2017
USD ($)
$ / shares
shares
May 31, 2016
shares
May 31, 2017
USD ($)
$ / shares
shares
May 31, 2016
USD ($)
shares
Nov. 30, 2016
USD ($)
Debt Instrument [Line Items]            
Debt Issuance Costs, Net   $ 18,300,000   $ 18,300,000   $ 21,800,000
Line of Credit Facility, Current Borrowing Capacity   275,000,000   275,000,000    
Letters of credit outstanding   $ 32,400,000   $ 32,400,000   31,000,000
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       $ (5,685,000) $ 0  
Notes and Loans Payable   $ 2,510,121,000   2,510,121,000   2,640,149,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   195,800,000   195,800,000    
Long-term Debt, Maturities, Repayments of Principal in Year Two   302,600,000   302,600,000    
Long-term Debt, Maturities, Repayments of Principal in Year Three   630,000,000   630,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Four   350,000,000   350,000,000    
Long-term Debt, Maturities, Repayments of Principal in Year Five   0   0    
Long-term Debt, Maturities, Repayments of Principal after Year Five   1,050,000,000   1,050,000,000    
Inventories pledged to collateralize mortgages and land contracts, carrying value   $ 61,600,000   61,600,000    
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Unsecured revolving credit facility, expiration date   Aug. 07, 2019        
Unsecured revolving credit facility, maximum borrowing capacity   $ 450,000,000   450,000,000    
Line of Credit Facility, Amount Outstanding   0   0    
Unsecured revolving credit facility, remaining borrowing capacity   $ 242,600,000   242,600,000    
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   0.50%        
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Unsecured revolving credit facility, maximum borrowing capacity   $ 137,500,000   137,500,000    
Line of Credit Facility, Amount Outstanding   32,400,000   32,400,000    
Unsecured revolving credit facility, remaining borrowing capacity   105,100,000   105,100,000    
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   $ 33,447,000   $ 33,447,000   $ 66,927,000
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   $ 227,973,000   $ 227,973,000   $ 227,379,000
Senior Notes [Member] | Senior notes due June 15, 2018 at 7 1/4%            
Debt Instrument [Line Items]            
Senior notes, rate   7.25%   7.25%   7.25%
Notes and Loans Payable   $ 299,755,000   $ 299,755,000   $ 299,647,000
Senior Notes [Member] | Senior notes due September 15, 2017 at 9.10%            
Debt Instrument [Line Items]            
Senior notes, rate   9.10%   9.10%   9.10%
Notes and Loans Payable   $ 164,748,000   $ 164,748,000   $ 263,932,000
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   $ 397,874,000   $ 397,874,000   $ 397,364,000
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   $ 345,510,000   $ 345,510,000   $ 344,811,000
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   $ 346,999,000   $ 346,999,000   $ 346,774,000
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   $ 247,562,000   $ 247,562,000   $ 247,404,000
Senior Notes [Member] | Senior Notes Due Two Thousand Seventeen at Nine Point One Percent [Member]            
Debt Instrument [Line Items]            
Senior notes, rate   9.10%   9.10%    
Extinguishment of Debt, Amount $ 100,000,000          
Debt Instrument Redemption Aggregate Price       $ 105,300,000    
Notes and Loans Payable   $ 165,000,000   $ 165,000,000