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Debt (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2014
May 29, 2016
May 31, 2015
May 25, 2014
Debt Instruments [Line Items]        
Extinguishment of debt, amount   $ 1,030,000,000    
Loss on extinguishment of debt   106,800,000 $ 91,300,000 $ 0
Gain (loss) on extinguishment of debt, before write off of deferred debt issuance cost   68,700,000    
Non-cash charges on extinguishment of debt   $ 38,100,000    
Senior Notes        
Debt Instruments [Line Items]        
Maximum range of interest rate adjustment on funds borrowed (percentage)   2.00%    
6.200% senior notes due October 2017        
Debt Instruments [Line Items]        
Interest rate of debt (percentage)   6.20%    
Maturity date of debt   Oct. 31, 2017    
6.800% senior notes due October 2037 | Senior Notes        
Debt Instruments [Line Items]        
Interest rate of debt (percentage)   6.80%    
Face amount of debt   $ 300,000,000.0    
Maturity date of debt   Oct. 01, 2037    
Revolving Credit Agreement | Revolving Credit Facility        
Debt Instruments [Line Items]        
Maximum borrowing available under the credit facility   $ 750,000,000.0    
Total debt to total capitalization ratio   0.75    
Base interest rate percentage of revolving credit facility in addition to federal funds rate (percentage)   0.50%    
6.200% senior notes due October 2017 | Senior Notes        
Debt Instruments [Line Items]        
Debt instrument, interest rate increase (percent) 0.25%      
Libor | Revolving Credit Agreement | Revolving Credit Facility        
Debt Instruments [Line Items]        
Applicable interest rate assuming a BBB equivalent credit rating level (percentage)   1.10%    
Base Rate Loans | Revolving Credit Agreement | Revolving Credit Facility        
Debt Instruments [Line Items]        
Applicable interest rate assuming a BBB equivalent credit rating level (percentage)   0.10%    
Revolving Credit Facility | Revolving Credit Agreement        
Debt Instruments [Line Items]        
Outstanding balance of credit agreement   $ 0    
Revolving Credit Facility | Eurodollar | Revolving Credit Agreement        
Debt Instruments [Line Items]        
Debt instrument, basis spread on variable rate   1.00%    
Long-term Debt | Variable-rate term loan due August 2017 [Member]        
Debt Instruments [Line Items]        
Extinguishment of debt, amount   $ 285,000,000    
Senior Notes | 6.200 Senior Notes Due Twenty Seventeen        
Debt Instruments [Line Items]        
Extinguishment of debt, amount   $ 500,000,000    
Interest rate of debt (percentage)   6.20%    
Senior Notes | 4.500% senior notes due October 2021        
Debt Instruments [Line Items]        
Extinguishment of debt, amount   $ 121,900,000    
Interest rate of debt (percentage)   4.50%    
Senior Notes | 3.350% senior notes due November 2022        
Debt Instruments [Line Items]        
Extinguishment of debt, amount   $ 111,100,000    
Interest rate of debt (percentage)   3.35%    
Senior Notes | 4.520% senior notes due August 2024        
Debt Instruments [Line Items]        
Extinguishment of debt, amount   $ 10,000,000    
Interest rate of debt (percentage)   4.52%