Accumulated Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 25, 2013	Aug. 26, 2012	May 26, 2013	May 27, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign Currency Translation Adjustment	$ (1.8)	$ (1.6)
Unrealized Gains (Losses) on Marketable Securities	0.2	0.4
Unrealized Gains (Losses) on Derivatives	(53.8)	(49.7)
Benefit Plan Funding Position	(77.4)	(95.7)
Accumulated Other Comprehensive Income (Loss)	(134.4)	(147.8)	(132.8)	(146.6)
Foreign Currency Translation Adjustment, Gain (loss)	(1.0)	0.8
Unrealized Gains (Losses) on Marketable Securities, Gain (loss)	(0.1)	(0.1)
Unrealized Gains (Losses) on Derivatives, Gain (loss)	(4.4)	(4.3)
Accumulated Other Comprehensive Income (Loss), Gain (loss)	(5.5)	(3.6)
Unrealized Gain (Loss) on Derivatives, Reclassification realized in net earnings	2.3	0.7
Benefit Plan Funding Position, Reclassification realized in net earnings	1.6	1.7
Accumulated Other Comprehensive Income (Loss), Reclassification realized in net earnings	3.9	2.4
Foreign Currency Translation Adjustment	(2.8)	(0.8)
Unrealized Gains (Losses) on Marketable Securities	0.1	0.3
Unrealized Gains (Losses) on Derivatives	(55.9)	(53.3)
Benefit Plan Funding Position	$ (75.8)	$ (94.0)