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Debt (Details) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jun. 30, 2010
Nov. 30, 2012
Mar. 02, 2012
Dec. 02, 2011
Nov. 30, 2012
From [Member]
Nov. 30, 2012
To [Member]
Feb. 28, 2010
Notes 2015 [Member]
Feb. 28, 2010
Notes 2020 [Member]
Feb. 28, 2010
Notes 2015 and 2020 [Member]
Nov. 30, 2012
Notes 2015 and 2020 [Member]
Mar. 02, 2012
Scenario i [Member]
Line of Credit [Member]
From [Member]
Mar. 02, 2012
Scenario i [Member]
Line of Credit [Member]
To [Member]
Mar. 02, 2012
Scenario ii [Member]
Line of Credit [Member]
Mar. 02, 2012
Scenario ii [Member]
Line of Credit [Member]
From [Member]
Mar. 02, 2012
Scenario ii [Member]
Line of Credit [Member]
To [Member]
Debt [Abstract]                              
Notes   $ 1,495,312,000   $ 1,494,627,000                      
Capital lease obligations 32,200,000 12,843,000   19,681,000                      
Total debt and capital lease obligations   1,508,155,000   1,514,308,000                      
Less: current portion   11,217,000   9,212,000                      
Debt and capital lease obligations   1,496,938,000   1,505,096,000                      
Debt Instrument [Line Items]                              
Senior notes, issued             600,000,000 900,000,000              
Senior notes, interest rate             3.25% 4.75%              
Proceeds from isssuance of senior notes                 1,500,000,000            
Issuance discount                 6,600,000            
Issuance cost                 10,700,000            
Effective Interest rate             3.45% 4.92%              
Interest payment on senior notes                   62,300,000          
Repurchase notes at price of their principal amount, plus accrued and unpaid interest                 101.00%            
Line of Credit Facility [Abstract]                              
Margin added to LIBOR to determine interest rate                     0.795% 1.30%   0.00% 0.30%
Percentage added to effective funds rate in determining interest rate                         0.50%    
Percentage added to LIBOR in determining interest rate                         1.00%    
Line of credit facility, amount outstanding   0                          
Total senior unsecured revolving credit facility     1,000,000,000                        
Option to request additional commitments on credit facility     500,000,000                        
Maximum aggregate, credit facility     $ 1,500,000,000                        
Commitment fees rate         0.08% 0.20%                  
Capital Lease Obligations [Abstract]                              
Sale-leaseback agreement period 43 months