LONG-TERM DEBT (Net Interest Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 25, 2013	Aug. 26, 2012
Debt Disclosure [Abstract]
Long-term debt	$ 99.7	$ 51.6
Short-term debt	0.3	0.2
Interest income	(0.6)	(0.8)
Interest capitalized	(3.8)	(1.7)
Interest expense, net	$ 95.6	$ 49.3