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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. 27, 2017
May 28, 2017
Derivatives, Fair Value [Line Items]    
Derivative contracts, derivative assets, fair value $ 0.4 $ 0.0
Derivative contracts, derivative liabilities, fair value 0.2 0.4
Equity forwards    
Derivatives, Fair Value [Line Items]    
Derivative contracts, derivative assets, fair value 0.2 0.0
Derivative contracts, derivative liabilities, fair value $ 0.0 0.4
Equity forwards | Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative contracts, number of shares outstanding 0.4  
Derivative contracts, weighted-average forward rates (in dollars per share) $ 67.01  
Derivative contracts, notional $ 25.5  
Derivative contracts, derivative assets, fair value 0.1 0.0
Derivative contracts, derivative liabilities, fair value $ 0.0 0.1
Equity forwards | Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative contracts, number of shares outstanding 0.4  
Derivative contracts, weighted-average forward rates (in dollars per share) $ 55.83  
Derivative contracts, notional $ 25.5  
Derivative contracts, derivative assets, fair value 0.1 0.0
Derivative contracts, derivative liabilities, fair value 0.0 0.3
Commodity contracts    
Derivatives, Fair Value [Line Items]    
Derivative contracts, notional 11.5  
Derivative contracts, derivative assets, fair value 0.2 0.0
Derivative contracts, derivative liabilities, fair value $ 0.2 $ 0.0