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Notes Payable (Narrative) (Details)
3 Months Ended 12 Months Ended
Sep. 15, 2017
USD ($)
Jan. 13, 2017
USD ($)
Jan. 29, 2013
USD ($)
$ / shares
Rate
shares
Aug. 31, 2017
Feb. 28, 2017
USD ($)
Nov. 30, 2017
USD ($)
shares
Nov. 30, 2016
USD ($)
shares
Nov. 30, 2015
USD ($)
shares
Nov. 30, 2013
Nov. 30, 2017
Nov. 30, 2017
shares
Nov. 30, 2017
Rate
Jul. 27, 2017
USD ($)
Jul. 26, 2017
USD ($)
Feb. 17, 2015
USD ($)
Rate
Mar. 25, 2014
USD ($)
Rate
Oct. 29, 2013
USD ($)
Rate
Jul. 31, 2012
USD ($)
Rate
Feb. 07, 2012
USD ($)
Rate
Jul. 30, 2009
USD ($)
Rate
Apr. 03, 2006
USD ($)
Rate
Debt Instrument [Line Items]                                          
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net           $ 15,400,000 $ 21,800,000                            
Conversion rate           0.0365297     0.0365297                        
Line of Credit Facility, Current Borrowing Capacity                         $ 500,000,000 $ 275,000,000              
Incremental Common Shares Attributable to Conversion of Debt Securities | shares           8,402,000 8,402,000 8,402,000                          
Letters of Credit Outstanding, Amount           $ 37,600,000 $ 31,000,000                            
Primarily inventories carrying value           27,600,000                              
Repayments of Long-term Debt           270,326,000 0 $ 199,906,000                          
Proceeds from Issuance of Senior Long-term Debt           0 $ 0 250,000,000                          
Common Stock, Capital Shares Reserved for Future Issuance | shares                     12,602,735                    
Long-term Debt, Fiscal Year Maturity [Abstract]                                          
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2013           303,100,000                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2014           637,100,000                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2015           350,000,000                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2016           0                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2017           800,000,000                              
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due thereafter           250,000,000                              
Convertible senior notes due February 1, 2019 at 1.375%                                          
Debt Instrument [Line Items]                                          
Senior notes, rate     1.375%             1.375%                      
Convertible Notes Payable [Member] | Convertible senior notes due February 1, 2019 at 1.375%                                          
Debt Instrument [Line Items]                                          
Conversion Price Premium | Rate     100.00%                                    
Incremental Common Shares Attributable to Conversion of Debt Securities | shares     8,401,831                                    
Percentage of Principal Amount for Purchase of Notes if Fundamental Change                   100.00%                      
Senior notes [1]     $ 230,000,000                                    
Senior notes, rate             1.375%     1.375%                      
Debt Conversion, Converted Instrument, Shares Issued | shares     36.5297                                    
Debt Instrument, Convertible, Conversion Price | $ / shares     $ 27.37                                    
Senior Notes [Member]                                          
Debt Instrument [Line Items]                                          
Percentage of principal amount for purchase of notes if change in control                   101.00%                      
Senior Notes [Member] | Senior Notes Due Two Thousand Twenty Three At Seven Point Six Two Five Percent [Domain]                                          
Debt Instrument [Line Items]                                          
Conversion Price Premium | Rate                             100.00%            
Senior notes [2]                             $ 250,000,000            
Proceeds from Issuance of Senior Long-term Debt               245,400,000                          
Senior notes, rate             7.625%     7.625%                      
Senior Notes [Member] | Senior notes due May 15, 2019 at 4.75%                                          
Debt Instrument [Line Items]                                          
Conversion Price Premium | Rate                               100.00%          
Senior notes [2]                               $ 400,000,000          
Senior notes, rate             4.75%     4.75%                      
Senior Notes [Member] | Senior notes due June 15, 2015 at 6 1/4%                                          
Debt Instrument [Line Items]                                          
Repayments of Long-term Debt               $ 199,900,000                          
Senior notes, rate                                      
Senior Notes [Member] | Senior notes due September 15, 2022 at 7.50%                                          
Debt Instrument [Line Items]                                          
Conversion Price Premium | Rate                                   100.00%      
Senior notes [3]                                   $ 350,000,000      
Senior notes, rate             7.50%     7.50%                      
Senior Notes [Member] | Senior notes due December 15, 2021 at 7.00%                                          
Debt Instrument [Line Items]                                          
Conversion Price Premium | Rate                                 100.00%        
Senior notes [2]                                 $ 450,000,000        
Senior notes, rate             7.00%     7.00%                      
Senior Notes [Member] | Senior notes due September 15, 2017 at 9.10%                                          
Debt Instrument [Line Items]                                          
Conversion Price Premium | Rate                                       100.00%  
Senior notes                                       $ 265,000,000  
Repayments of Long-term Debt $ 165,000,000                                        
Senior notes, rate             9.10%       9.10%                  
Extinguishment of Debt, Amount   $ 100,000,000     $ 105,300,000                                
Debt Instrument Redemption Aggregate Price   $ 5,700,000                                      
Senior Notes [Member] | Senior notes due June 15, 2018 at 7 1/4%                                          
Debt Instrument [Line Items]                                          
Conversion Price Premium | Rate                                         100.00%
Senior notes [3]                                         $ 300,000,000
Senior notes, rate             7.25%     7.25%                      
Senior Notes [Member] | Senior notes due March 15, 2020 at 8.00%                                          
Debt Instrument [Line Items]                                          
Conversion Price Premium | Rate                                     100.00%    
Senior notes [3]                                     $ 350,000,000    
Senior notes, rate             8.00%     8.00%                      
Revolving Credit Facility [Member]                                          
Debt Instrument [Line Items]                                          
Line of Credit Facility, Expiration Date       Jul. 27, 2021                                  
Line of Credit Facility, Maximum Borrowing Capacity           600,000,000                              
Line of Credit Facility, Amount Outstanding           0                              
Line of Credit Facility, Remaining Borrowing Capacity           462,400,000                              
Letter of Credit [Member]                                          
Debt Instrument [Line Items]                                          
Line of Credit Facility, Current Borrowing Capacity           250,000,000                              
Line of Credit Facility, Amount Outstanding           37,645,000.000                              
Line of Credit Facility, Remaining Borrowing Capacity           212,400,000                              
LOC Facilities [Member]                                          
Debt Instrument [Line Items]                                          
Letters of Credit Outstanding, Amount           $ 0 $ 0                            
Minimum | Mortgages and Land Contracts Due to Land Sellers and Other Loans [Member]                                          
Debt Instrument [Line Items]                                          
Senior notes, rate             100.00%     100.00%                      
Minimum | Revolving Credit Facility [Member]                                          
Debt Instrument [Line Items]                                          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage           0.30%                              
Maximum | Mortgages and Land Contracts Due to Land Sellers and Other Loans [Member]                                          
Debt Instrument [Line Items]                                          
Senior notes, rate             700.00%     300.00%                      
Maximum | Revolving Credit Facility [Member]                                          
Debt Instrument [Line Items]                                          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage           0.45%                              
[1] (c)We may not redeem these notes prior to November 6, 2018. On or after November 6, 2018, and prior to the stated maturity date, we may, at our option, redeem all or part of the notes at a redemption price equal to 100% of the principal amount of the notes being redeemed plus accrued and unpaid interest to, but excluding the redemption date.
[2] (b)At our option, these notes may be redeemed, in whole at any time or from time to time in part, at a redemption price equal to the greater of (i) 100% of the principal amount of the notes being redeemed and (ii) the sum of the present values of the remaining scheduled payments of principal and interest on the notes being redeemed (exclusive of interest accrued to the applicable redemption date), discounted to the redemption date at a defined rate, plus, in each case, accrued and unpaid interest on the notes being redeemed to, but excluding, the applicable redemption date, except that three months prior to the stated maturity dates for the 4.75% Senior Notes due 2019 and the 7.00% Senior Notes due 2021 and until their respective maturity, and six months prior to the stated maturity date for the 7.625% Senior Notes due 2023 and until their maturity, the redemption price will be equal to 100% of the principal amount of the notes being redeemed, plus, in each case, accrued and unpaid interest on the notes being redeemed to, but excluding, the applicable redemption date.
[3] (a)At our option, these notes may be redeemed, in whole at any time or from time to time in part, at a redemption price equal to the greater of (i) 100% of the principal amount of the notes being redeemed and (ii) the sum of the present values of the remaining scheduled payments of principal and interest on the notes being redeemed (exclusive of interest accrued to the applicable redemption date), discounted to the redemption date at a defined rate, plus, in each case, accrued and unpaid interest on the notes being redeemed to the applicable redemption date.