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Retirement Plans (Defined Benefit And Postretirement Benefit Plans) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
May 24, 2020
May 26, 2019
May 27, 2018
May 28, 2017
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 $ 0.0 19.9
Expected long-term rate of return on plan assets (percentage)   4.25% 5.75%  
Amortization of net actuarial gain (loss)   $ (3.5)    
Defined Benefit Plans | Fixed Income Securities        
Defined Benefit Plan Disclosure [Line Items]        
Target asset fund allocation (percentage)   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)     66.00%  
Postretirement Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Expected employer contribution to the benefit plans   $ 1.4    
Settlement loss recognized   0.0 $ 0.0 $ 0.0
Amortization of net actuarial gain (loss)   3.3    
Maximum | Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Expected employer contribution to the benefit plans   $ 0.4    
10-Year Rates | Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Actual rate of return on plan assets (percentage)   9.60%    
15-Year Rates | Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Actual rate of return on plan assets (percentage)   7.90%    
20-Year Rates | Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Actual rate of return on plan assets (percentage)   7.60%    
Forecast        
Defined Benefit Plan Disclosure [Line Items]        
Settlement loss recognized $ (130.0)