DERIVATIVE FINANCIAL INSTRUMENTS (Derivatives Not Designated as Hedging Instruments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 25, 2013	Aug. 26, 2012
Derivatives, Fair Value [Line Items]
Total gain from derivative instruments not designated as hedging instruments	$ 13.1	$ 108.6
Commodity contracts | Sales [Member]
Derivatives, Fair Value [Line Items]
Total gain from derivative instruments not designated as hedging instruments	(1.0)	(0.7)
Commodity contracts | Cost of goods sold
Derivatives, Fair Value [Line Items]
Total gain from derivative instruments not designated as hedging instruments	14.7	119.2
Commodity contracts | Selling, General and Administrative Expenses
Derivatives, Fair Value [Line Items]
Total gain from derivative instruments not designated as hedging instruments	0	0.2
Foreign exchange contracts | Cost of goods sold
Derivatives, Fair Value [Line Items]
Total gain from derivative instruments not designated as hedging instruments	(1.2)	(4.1)
Foreign exchange contracts | Selling, General and Administrative Expenses
Derivatives, Fair Value [Line Items]
Total gain from derivative instruments not designated as hedging instruments	$ 0.6	$ (6.0)