BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Net Derivative Gains (Losses) from Economic Hedges of Forecasted Commodity Consumption and Foreign Currency Risk (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 25, 2018	Feb. 26, 2017	Feb. 25, 2018	Feb. 26, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred			$ (0.6)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ (0.5)	$ 0.3	(4.9)	$ 3.0
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(1.3)	(0.2)	(6.8)	2.6
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to Grocery & Snacks
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	0.5	0.1	(0.5)	2.0
Commodity contracts | Reporting segments | Net derivative losses allocated to Refrigerated & Frozen
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.3)	(0.8)	(0.2)	(0.3)
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to International
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(1.5)	0.6	(5.9)	0.9
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to Foodservice
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	0.0	(0.1)	(0.2)	0.1
Commodity contracts | Reporting segments | Net derivative losses allocated to Commercial
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	0.0	0.0	0.0	(0.1)
Commodity contracts | Net derivative gains recognized in general corporate expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ 0.8	$ 0.5	$ 1.9	$ 0.4