SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reclassifications from AOCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 22, 2015	Feb. 23, 2014	Feb. 22, 2015	Feb. 23, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense, net	$ 80.3	$ 95.0	$ 243.3	$ 286.3
Selling, general and administrative expenses	1,726.1	534.9	2,950.7	1,626.1
Total before tax	952.1	(226.1)	814.3	(569.9)
Income tax expense (benefit)	2.5	78.2	129.0	213.1
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net of tax	0	34.4	(0.3)	34.5
Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense, net			(0.5)	0.1
Selling, general and administrative expenses	0	54.9	0	54.9
Total before tax	0	54.9	(0.5)	55.0
Income tax expense (benefit)	0	(20.5)	0.2	(20.5)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of pension and postretirement healthcare liabilities:
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Net prior service benefit	(1.1)	(0.8)	(3.2)	(2.5)
Net actuarial losses	0.9	1.7	2.6	5.0
Total before tax	(0.2)	0.9	(0.6)	2.5
Income tax expense (benefit)	0.1	(0.3)	0.2	(0.9)
Net of tax	$ (0.1)	$ 0.6	$ (0.4)	$ 1.6