LONG-TERM DEBT AND REVOLVING CREDIT FACILITY - Schedule of Net Interest Expense from Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016
Debt Disclosure [Abstract]
Long-term debt	$ 46.5	$ 77.3	$ 164.0	$ 239.5
Short-term debt	0.2	0.8	0.6	1.6
Interest income	(1.3)	(0.5)	(2.8)	(0.6)
Interest capitalized	0.3	(1.2)	(3.8)	(4.8)
Net interest expense	$ 45.7	$ 76.4	$ 158.0	$ 235.7