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Mortgages and Notes Payable (Narratives) (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended
Jan. 29, 2013
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Mar. 12, 2013
Nov. 30, 2012
Aug. 31, 2013
Letter of Credit [Member]
Mar. 12, 2013
Letter of Credit [Member]
Mar. 12, 2013
Revolving Credit Facility [Member]
Aug. 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%
Jul. 31, 2012
Senior Notes [Member]
Jan. 29, 2013
Convertible Notes Payable [Member]
Convertible senior notes due February 1, 2019 at 1.375%
Aug. 31, 2013
Convertible Notes Payable [Member]
Convertible senior notes due February 1, 2019 at 1.375%
Feb. 07, 2012
Senior Notes [Member]
Feb. 29, 2012
Senior Notes [Member]
Aug. 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%
Aug. 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%
Aug. 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]                                                      
Early Repayment of Senior Debt                             $ 252,200,000     $ 340,500,000                  
Extinguishment of Debt, Amount                             244,900,000     340,000,000                  
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%                            
Line of Credit Facility, Amount Outstanding                     0                                
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%
Gain (loss) on early extinguishment of debt     8,300,000 0 10,278,000                           2,000,000                
Percentage of principal amount in relation to issued value of senior notes                               100.00%                      
Debt Conversion, Converted Instrument, Shares Issued 36.5297                                                    
Debt instrument, convertible, conversion price                               $ 27.37                      
Debt instrument, convertible, conversion premium                               47.00%                      
Share price                               $ 18.62                      
Incremental Common Shares Attributable to Conversion of Debt Securities   8,402,000 0 0 0                     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                      
Ownership share in guarantor subsidiaries (percent)       100.00%                                              
Letters of credit outstanding   41,100,000   41,100,000     41,900,000                                        
Inventories pledged to collateralize mortgages and land contracts, carrying value   80,000,000   80,000,000                                              
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   22,500,000   22,500,000                                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2014   83,000,000   83,000,000                                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2015   342,400,000   342,400,000                                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2016   2,500,000   2,500,000                                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2017   261,900,000   261,900,000                                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due thereafter   $ 1,220,000,000   $ 1,220,000,000