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Debt (Narrative) (Details) - USD ($)
12 Months Ended
Feb. 22, 2018
May 27, 2018
May 28, 2017
May 29, 2016
Oct. 27, 2017
Oct. 03, 2011
Debt Instruments [Line Items]            
Loss on extinguishment of debt   $ 102,200,000 $ 0 $ 106,800,000    
Extinguishment of debt, cash portion   97,300,000   $ 68,700,000    
Extinguishment of debt, noncash portion   $ 4,900,000        
Revolving Credit Agreement | Revolving Credit Facility            
Debt Instruments [Line Items]            
Maximum borrowing available under the credit facility         $ 750,000,000.0 $ 750,000,000
Total debt to total capitalization ratio   0.75        
Outstanding balance of credit agreement   $ 0        
Revolving Credit Agreement | Revolving Credit Facility | Federal Funds Effective Swap Rate            
Debt Instruments [Line Items]            
Debt instrument, basis spread on variable rate     0.50%      
Revolving Credit Agreement | Revolving Credit Facility | Eurodollar            
Debt Instruments [Line Items]            
Debt instrument, basis spread on variable rate     1.00%      
Revolving Credit Agreement | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)            
Debt Instruments [Line Items]            
Debt instrument, basis spread on variable rate     1.00%      
Revolving Credit Agreement | Revolving Credit Facility | Base Rate            
Debt Instruments [Line Items]            
Debt instrument, basis spread on variable rate     0.00%      
4.550% senior notes due February 2048            
Debt Instruments [Line Items]            
Interest rate of debt (percentage) 4.55% 4.55%        
Senior Notes | 4.550% senior notes due February 2048            
Debt Instruments [Line Items]            
Face amount of debt $ 300,000,000          
Discount and issuance costs $ 3,700,000          
Redemption price, percentage 101.00%          
Extinguishment of debt, amount $ 310,900,000          
Senior Notes | 6.000% senior notes due August 2035            
Debt Instruments [Line Items]            
Interest rate of debt (percentage) 6.00%          
Extinguishment of debt, amount $ 53,700,000          
Senior Notes | 6.800% senior notes due October 2037            
Debt Instruments [Line Items]            
Interest rate of debt (percentage) 6.80%          
Extinguishment of debt, amount $ 257,200,000