SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Income Tax Expense (Benefit)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 23, 2014	Nov. 24, 2013	Nov. 23, 2014	Nov. 24, 2013
Accounting Policies [Abstract]
Net derivative adjustment	$ 0	$ (3.6)	$ (0.2)	$ 23.3
Unrealized gains on available-for-sale securities	0.1	0.1	0.1	0.2
Pension and postretirement healthcare liabilities	(0.1)	0.7	0.8	0.7
Income tax expense (benefit)	$ 0	$ (2.8)	$ 0.7	$ 24.2