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Retirement Plans (Funding Of Defined Benefit Pension Plans And Postretirement Benefit Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2020
May 26, 2019
May 27, 2018
Defined Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit pension plans and postretirement benefit plans funding $ 13.2 $ 0.4 $ 60.8
Defined benefit plan plant assets, voluntary funding contributions     60.4
Postretirement Benefit Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit pension plans and postretirement benefit plans funding $ 1.3 $ 1.3 $ 1.2