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Retirement Plans (Defined Benefit And Postretirement Benefit Plans) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 27, 2018
May 27, 2018
May 28, 2017
May 29, 2016
Defined Benefit Plan Disclosure [Line Items]        
Settlement loss recognized $ 19.9      
Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Settlement loss recognized   $ 0.0 $ 19.9 $ 0.0
Expected long-term rate of return on plan assets (percentage)   5.75% 6.50% 6.50%
Defined benefit plan, funded percentage 100.00% 100.00%    
Amortization of net actuarial gain (loss) $ (2.5) $ (2.5)    
Defined Benefit Plans | Fixed Income Securities        
Defined Benefit Plan Disclosure [Line Items]        
Target asset fund allocation (percentage) 100.00% 100.00%    
Defined Benefit Plans | Global Fixed-Income Commingled Funds        
Defined Benefit Plan Disclosure [Line Items]        
Concentration of market risk related to large investments in a single fund or sector (percentage)     99.90%  
Postretirement Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Expected employer contribution to the benefit plans $ 1.4 $ 1.4    
Settlement loss recognized   0.0 $ 0.0 $ 0.0
Amortization of net actuarial gain (loss) 3.2 3.2    
Maximum | Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Expected employer contribution to the benefit plans $ 0.4 $ 0.4    
10-Year Rates | Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Actual rate of return on plan assets (percentage)   6.00%    
15-Year Rates | Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Actual rate of return on plan assets (percentage)   8.60%    
20-Year Rates | Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Actual rate of return on plan assets (percentage)   7.70%