Retirement Plans (Funding Of Defined Benefit Pension Plans And Postretirement Benefit Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plans and postretirement benefit plans funding	$ 60.4		$ 25.0
Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plans and postretirement benefit plans funding	60.8	$ 0.4	25.4
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plans and postretirement benefit plans funding	$ 1.2	$ 1.2	$ 1.1