Retirement Plans (Components Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2016	Feb. 22, 2015	Feb. 28, 2016	Feb. 22, 2015
Defined Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0.0	$ 0.4	$ 0.0	$ 0.9
Interest cost	2.7	2.5	8.0	7.5
Expected return on plan assets	(3.7)	(3.8)	(10.9)	(11.4)
Recognized net actuarial loss	0.7	0.6	2.1	1.9
Net periodic benefit (credit) cost	(0.3)	(0.3)	(0.8)	(1.1)
Postretirement Benefit Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.0	0.1	0.1	0.4
Interest cost	0.2	0.0	0.6	0.8
Amortization of unrecognized prior service credit	(1.2)	(1.6)	(3.6)	(1.6)
Recognized net actuarial loss	0.3	0.3	0.9	0.6
Net periodic benefit (credit) cost	$ (0.7)	$ (1.2)	$ (2.0)	$ 0.2