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		6 Months Ended
	Nov. 24, 2019	Nov. 25, 2018	Nov. 24, 2019	Nov. 25, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred			$ (4.8)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ 0.5	$ 2.3	(6.8)	$ (4.2)
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(1.3)	(0.5)	(1.4)	(0.6)
Commodity contracts | Reporting segments | Net derivative losses allocated to Grocery & Snacks
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.5)	(0.8)	(0.6)	(1.0)
Commodity contracts | Reporting segments | Refrigerated & Frozen
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.4)	(0.4)	(0.7)	(0.5)
Commodity contracts | Reporting segments | Net derivative gains allocated to International
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.4)	0.8	(0.3)	1.1
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	(0.2)
Commodity contracts | Corporate
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ 1.8	$ 2.8	$ (5.4)	$ (3.6)