STOCKHOLDERS' EQUITY - Other Comprehensive Income (Loss), Net of Tax, by Component (Details) - USD ($) $ in Millions	12 Months Ended
	May 29, 2016	May 28, 2017	May 31, 2015
Accumulated balances for each component of other comprehensive income (loss), net of tax
Unrealized currency translation gains (losses)	$ (9.2)	$ (10.3)	$ (3.7)
Pension benefit obligations of equity method investee, net of reclassification adjustments		1.0	(1.4)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total	(9.2)	$ (9.3)	$ (5.1)
Reclassification related to settlement of a pension plan of an international potato venture	$ (4.0)