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. 24, 2019	Feb. 25, 2018	Feb. 24, 2019	Feb. 25, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred			$ (1.3)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ 0.8	$ (0.5)	(3.4)	$ (4.9)
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	1.0	(1.3)	0.4	(6.8)
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to Grocery & Snacks
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	0.0	0.5	(1.0)	(0.5)
Commodity contracts | Reporting segments | Net derivative losses allocated to Refrigerated & Frozen
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.2)	(0.3)	(0.7)	(0.2)
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to International
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	1.3	(1.5)	2.4	(5.9)
Commodity contracts | Reporting segments | Net derivative losses allocated to Foodservice
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.1)	0.0	(0.3)	(0.2)
Commodity contracts | Net derivative gains (losses) recognized in general corporate expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ (0.2)	$ 0.8	$ (3.8)	$ 1.9