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Mortgages and Notes Payable (Narratives) (Details) (USD $)
6 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 6 Months Ended
May 31, 2013
May 31, 2012
Mar. 12, 2013
Nov. 30, 2012
May 31, 2013
Letter of Credit [Member]
Mar. 12, 2013
Letter of Credit [Member]
Mar. 12, 2013
Revolving Credit Facility [Member]
May 31, 2013
Revolving Credit Facility [Member]
Mar. 12, 2013
Revolving Credit Facility [Member]
Minimum [Member]
Mar. 12, 2013
Revolving Credit Facility [Member]
Maximum [Member]
Jan. 29, 2013
Convertible senior notes due February 1, 2019 at 1.375%
Jan. 29, 2013
Convertible Notes Payable [Member]
Convertible senior notes due February 1, 2019 at 1.375%
May 31, 2013
Convertible Notes Payable [Member]
Convertible senior notes due February 1, 2019 at 1.375%
May 31, 2012
Senior Notes [Member]
Feb. 07, 2012
Senior Notes [Member]
May 31, 2013
Senior Notes [Member]
Senior notes due March 15, 2020 at 8.00%
Nov. 30, 2012
Senior Notes [Member]
Senior notes due March 15, 2020 at 8.00%
Feb. 07, 2012
Senior Notes [Member]
Senior notes due March 15, 2020 at 8.00%
May 31, 2013
Senior Notes [Member]
Senior notes due September 15, 2017 at 9.10%
Nov. 30, 2012
Senior Notes [Member]
Senior notes due September 15, 2017 at 9.10%
May 31, 2013
Senior Notes [Member]
Senior notes due September 15, 2022 at 7.50%
Nov. 30, 2012
Senior Notes [Member]
Senior notes due September 15, 2022 at 7.50%
Jul. 31, 2012
Senior Notes [Member]
Senior notes due September 15, 2022 at 7.50%
Debt Instrument [Line Items]                                              
Debt Instrument, Convertible, Conversion Ratio                       0.0365297                      
Unsecured revolving credit facility, current borrowing capacity     $ 200,000,000.0                                        
Unsecured revolving credit facility, expiration date             Mar. 12, 2016                                
Unsecured revolving credit facility, contingent expiration date             Sep. 15, 2014                                
Unsecured revolving credit facility, contingent expiration, senior notes threshold             200,000,000                                
Unsecured revolving credit facility, maximum borrowing capacity           100,000,000 300,000,000                                
Line of credit facility, unused capacity, commitment fee percentage                 0.50% 0.75%                          
Unsecured revolving credit facility, remaining borrowing capacity         100,000,000     200,000,000                              
Line of credit facility, significant subsidiary threshold, percent 5.00%           5.00%                                
Line of credit facility, non guarantor subsidiary threshold, percent 10.00%           10.00%                                
Number of addtional guarantor subsidiaries               12                              
Debt instrument, face amount                     230,000,000 230,000,000 230,000,000         350,000,000 265,000,000       350,000,000
Senior notes, rate                     1.375%   1.375%     8.00% 8.00% 8.00% 9.10% 9.10% 7.50% 7.50% 7.50%
Repayment of aggregate principal amount of senior notes                             340,000,000                
Total consideration paid to purchase the notes 0 340,481,000                       340,500,000                  
Gain (loss) on early extinguishment of debt 0 2,003,000                       2,000,000                  
Percentage of principal amount in relation to issued value of senior notes                       100.00%                      
Debt instrument, convertible, conversion price                       $ 27.37                      
Debt instrument, convertible, conversion premium                       47.00%                      
Share price                       $ 18.62                      
Convertible stock, shares issued upon conversion                       8,401,831                      
Percentage of principal amount in relation to redemption value of notes                         100.00%                    
Percentage of principal amount for purchase of notes if change in control                         100.00%                    
Proceeds from issuance of senior notes                       222,700,000                      
Letters of credit outstanding 41,900,000     41,900,000                                      
Inventories pledged to collateralize mortgages and land contracts, carrying value 85,700,000                                            
Principal payments on senior notes, mortgages and land contracts                                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2013 28,200,000                                            
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2014 85,100,000                                            
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2015 342,300,000                                            
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2016 1,300,000                                            
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2017 261,700,000                                            
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due thereafter $ 1,220,000,000