SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reclassifications from AOCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 24, 2014	Aug. 25, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense, net	$ 83.7	$ 95.8
Total before tax	(111.2)	(133.4)
Income tax expense (benefit)	42.5	28.9
Thirteen Weeks Ended
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net of tax	(0.3)	0.1
Thirteen Weeks Ended | Fair value hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense, net	0	0.1
Thirteen Weeks Ended | Cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense, net	(0.5)	0
Total before tax	(0.5)	0.1
Income tax expense (benefit)	0.2	0
Thirteen Weeks Ended | Amortization of pension and postretirement healthcare liabilities:
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net prior service cost	(1.1)	(0.8)
Net actuarial losses	0.9	1.6
Total before tax	(0.2)	0.8
Income tax expense (benefit)	0.1	(0.3)
Net of tax	$ (0.1)	$ 0.5