SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Income Tax Expense (Benefit)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 23, 2014	Feb. 24, 2013	Feb. 23, 2014	Feb. 24, 2013
Accounting Policies [Abstract]
Net derivative adjustment	$ 15.6	$ 19.1	$ 38.9	$ 17.4
Unrealized gains (losses) on available-for-sale securities	(0.1)	0.1	0.1	0.1
Pension and postretirement healthcare liabilities	0.2	(1.8)	0.9	(1.2)
Other comprehensive income tax, total	$ 15.7	$ 17.4	$ 39.9	$ 16.3