Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions	3 Months Ended
	Aug. 28, 2011	Aug. 29, 2010
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.4	$ 1.5
Interest cost	2.2	2.4
Expected return on plan assets	(4.5)	(4.0)
Recognized net actuarial loss	1.6	1.1
Net periodic benefit cost	0.7	1.0
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.2	0.2
Interest cost	0.3	0.6
Recognized net actuarial loss	0	0.3
Net periodic benefit cost	$ 0.5	$ 1.1