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. 23, 2020	Feb. 24, 2019	Feb. 23, 2020	Feb. 24, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred			$ (8.0)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ (5.7)	$ 0.8	(12.5)	$ (3.4)
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(1.9)	1.0	(3.3)	0.4
Commodity contracts | Reporting segments | Net derivative losses allocated to Grocery & Snacks
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.9)	0.0	(1.5)	(1.0)
Commodity contracts | Reporting segments | Refrigerated & Frozen
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	0.0	(0.2)	(0.7)	(0.7)
Commodity contracts | Reporting segments | Net derivative gains allocated to International
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.8)	1.3	(1.1)	2.4
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to Foodservice
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.2)	(0.1)	0.0	(0.3)
Commodity contracts | Corporate
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ (3.8)	$ (0.2)	$ (9.2)	$ (3.8)