INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2016	Feb. 22, 2015	Feb. 28, 2016	Feb. 22, 2015	May. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense	$ 91.0	$ 100.6	$ 259.3	$ 247.9
Effective tax rate (as a percent)	33.00%	32.00%	33.00%	32.00%
Gross unrecognized tax benefits	$ 33.9		$ 33.9		$ 35.3
Unrecognized tax benefits with uncertainty of timing of deductibility	1.7		1.7		1.7
Unrecognized liabilities for gross interest and penalties	9.9		9.9		9.5
Unrecognized tax benefits that would favorably impact effective tax rate	22.2		22.2		$ 23.1
Gross unrecognized tax benefits, decrease (up to)	$ 2.2		$ 2.2