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Notes Payable (Narrative) (Details)
3 Months Ended 12 Months Ended
Jun. 15, 2018
USD ($)
Sep. 15, 2017
USD ($)
Jan. 13, 2017
USD ($)
Jan. 29, 2013
$ / shares
Rate
shares
Feb. 28, 2017
USD ($)
Nov. 30, 2018
USD ($)
shares
Nov. 30, 2017
USD ($)
Rate
shares
Nov. 30, 2016
USD ($)
shares
Nov. 30, 2013
Jul. 27, 2017
USD ($)
Feb. 17, 2015
Rate
Mar. 25, 2014
Rate
Oct. 29, 2013
Rate
Jul. 31, 2012
Rate
Feb. 07, 2012
Rate
Jul. 30, 2009
Rate
Apr. 03, 2006
Rate
Debt Instrument [Line Items]                                  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net           $ 9,800,000 $ 15,400,000                    
Conversion rate             0.0365297   0.0365297                
Line of Credit Facility, Current Borrowing Capacity                   $ 500,000,000              
Incremental Common Shares Attributable to Conversion of Debt Securities | shares           8,402,000 8,402,000 8,402,000                  
Letters of Credit Outstanding, Amount           $ 28,000,000 $ 37,600,000                    
Primarily inventories carrying value           132,600,000                      
Repayments of Long-term Debt           $ 300,000,000 $ 270,326,000 $ 0                  
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 2019           $ 670,000,000                      
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2020           350,000,000                      
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2021           0                      
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2022           800,000,000                      
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2023           250,000,000                      
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due thereafter           $ 0                      
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, rate           1.375% 1.375%                    
Debt Conversion, Converted Instrument, Shares Issued | shares       36.5297                          
Debt Instrument, Convertible, Conversion Price | $ / shares       $ 27.37                          
Mortgages and Land Contracts Due to Land Sellers and Other Loans [Member]                                  
Debt Instrument [Line Items]                                  
Senior notes, rate           7.00%                      
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, 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, rate           4.75% 4.75%                    
Senior Notes [Member] | Senior notes due September 15, 2022 at 7.50%                                  
Debt Instrument [Line Items]                                  
Conversion Price Premium | Rate                           100.00%      
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, 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%  
Repayments of Long-term Debt   $ 165,000,000                              
Senior notes, rate | Rate             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%
Repayments of Long-term Debt [1] $ 300,000,000                                
Senior notes, rate             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, 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           472,000,000                      
Letter of Credit [Member]                                  
Debt Instrument [Line Items]                                  
Line of Credit Facility, Current Borrowing Capacity           250,000,000                      
Line of Credit Facility, Amount Outstanding           28,010,000.000                      
Line of Credit Facility, Remaining Borrowing Capacity           222,000,000                      
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             3.00%                    
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             6.00%                    
Maximum | Revolving Credit Facility [Member]                                  
Debt Instrument [Line Items]                                  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage           0.45%                      
[1] (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, 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.