Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 24, 2013	Nov. 25, 2012	Nov. 24, 2013	Nov. 25, 2012
Change in fair value of marketable securities, tax	$ 0	$ 0.1	$ 0.1	$ 0.1
Change in fair value of derivatives, tax	3.1	(0.9)	2.1	(2.6)
Net unamortized gain arising during period, including amortization of unrecognized net actuarial loss, tax	$ 1.0	$ 1.0	$ 2.0	$ 2.1