LONG-TERM DEBT (Net Interest Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 24, 2014	Aug. 25, 2013
Debt Disclosure [Abstract]
Long-term debt	$ 85.6	$ 99.7
Short-term debt	0.5	0.3
Interest income	(0.5)	(0.5)
Interest capitalized	(1.9)	(3.7)
Interest expense, net	$ 83.7	$ 95.8