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. 25, 2018	Feb. 26, 2017	Feb. 25, 2018	Feb. 26, 2017
Debt Disclosure [Abstract]
Long-term debt	$ 40.9	$ 46.5	$ 118.4	$ 164.0
Short-term debt	0.4	0.2	1.5	0.6
Interest income	(0.8)	(1.3)	(2.8)	(2.8)
Interest capitalized	(0.7)	0.3	(2.9)	(3.8)
Net interest expense	$ 39.8	$ 45.7	$ 114.2	$ 158.0