Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 26, 2012	Aug. 28, 2011
Defined Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.2	$ 1.4
Interest cost	2.5	2.2
Expected return on plan assets	(5.0)	(4.5)
Recognized net actuarial loss	2.2	1.6
Net periodic benefit cost	0.9	0.7
Postretirement Benefit Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.2	0.2
Interest cost	0.3	0.3
Net periodic benefit cost	$ 0.5	$ 0.5