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Derivative Instruments and Hedging Activities (Notional and Fair Values Of Derivative Contracts Designated And Not Designated As Hedging Instruments) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Aug. 26, 2018
May 27, 2018
Derivatives, Fair Value [Line Items]    
Derivative contracts, derivative assets, fair value $ 3.5 $ 1.1
Derivative contracts, derivative liabilities, fair value 0.0 0.0
Equity forwards    
Derivatives, Fair Value [Line Items]    
Derivative contracts, derivative assets, fair value 3.3 0.6
Derivative contracts, derivative liabilities, fair value $ 0.0 0.0
Equity forwards | Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative contracts, number of shares outstanding 0.5  
Derivative contracts, weighted-average forward rates (in dollars per share) $ 88.16  
Derivative contracts, notional $ 42.9  
Derivative contracts, derivative assets, fair value 1.0 0.2
Derivative contracts, derivative liabilities, fair value $ 0.0 0.0
Equity forwards | Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative contracts, number of shares outstanding 0.5  
Derivative contracts, weighted-average forward rates (in dollars per share) $ 66.67  
Derivative contracts, notional $ 32.0  
Derivative contracts, derivative assets, fair value 2.3 0.4
Derivative contracts, derivative liabilities, fair value 0.0 0.0
Commodity contracts    
Derivatives, Fair Value [Line Items]    
Derivative contracts, notional 4.9  
Derivative contracts, derivative assets, fair value 0.2 0.5
Derivative contracts, derivative liabilities, fair value $ 0.0 $ 0.0