Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 26, 2012	Feb. 27, 2011	Feb. 26, 2012	Feb. 27, 2011
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1.4	$ 1.4	$ 4.1	$ 4.4
Interest cost	2.2	2.4	6.7	7.2
Expected return on plan assets	(4.5)	(4.0)	(13.4)	(12.1)
Unrecognized prior service cost	0	0.1	0	0.1
Recognized net actuarial loss	1.6	1.1	4.7	3.4
Net periodic benefit cost	0.7	1.0	2.1	3.0
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	0.6	0.7
Interest cost	0.3	0.5	1.0	1.7
Recognized net actuarial loss	0	0.4	0	1.0
Net periodic benefit cost	$ 0.5	$ 1.1	$ 1.6	$ 3.4