DERIVATIVE FINANCIAL INSTRUMENTS - Gains (losses) from derivatives not designated as hedging instruments (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016
Derivative Instruments, Gain (Loss)
Amount of Gain or (Loss) Recognized on Derivative	$ (1.9)	$ (1.8)	$ (2.1)	$ (7.0)
Commodity contracts | Cost of sales
Derivative Instruments, Gain (Loss)
Amount of Gain or (Loss) Recognized on Derivative	$ (1.9)	(2.2)	(2.0)	(7.4)
Foreign exchange contracts | Selling, general and administrative expense.
Derivative Instruments, Gain (Loss)
Amount of Gain or (Loss) Recognized on Derivative		$ 0.4	$ (0.1)	$ 0.4