SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Income Tax Expense (Benefit)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 25, 2014	May 26, 2013	May 27, 2012
Accounting Policies [Abstract]
Net derivative adjustment	$ 38.9	$ 19.3	$ (52.7)
Unrealized gains (losses) on available-for-sale securities	0.1	0.1	(0.1)
Pension and postretirement healthcare liabilities	9.4	42.0	(35.4)
Other comprehensive income tax, total	$ 48.4	$ 61.4	$ (88.2)