Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 22, 2015	Feb. 23, 2014	Feb. 22, 2015	Feb. 23, 2014	Nov. 23, 2014
Defined Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0.4	$ 1.1	$ 0.9	$ 3.3
Interest cost	2.5	2.6	7.5	7.7
Expected return on plan assets	(3.8)	(4.3)	(11.4)	(12.9)
Recognized net actuarial loss	0.6	2.2	1.9	6.8
Net periodic benefit (credit) cost	(0.3)	1.6	(1.1)	4.9
Postretirement Benefit Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.1	0.2	0.4	0.6
Interest cost	0	0.4	0.8	1.0
Unrecognized prior service cost	(1.6)	0	(1.6)	0
Recognized net actuarial loss	0.3	0	0.6	0
Net periodic benefit (credit) cost	(1.2)	0.6	0.2	1.6
Defined Benefit Plan, effect of plan amendment on accumulated benefit obligation					(23.7)
Defined Benefit Plan, future amortization of prior service cost (credit)			$ (3.4)