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
	Aug. 25, 2019	Aug. 26, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ (6.9)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(7.3)	$ (6.5)
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.1)	(0.1)
Commodity contracts | Reporting segments | Net derivative losses allocated to Grocery & Snacks
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.1)	(0.2)
Commodity contracts | Reporting segments | Refrigerated & Frozen
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.3)	(0.1)
Commodity contracts | Reporting segments | Net derivative gains allocated to International
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	0.1	0.3
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)
Commodity contracts | Net derivative losses recognized in general corporate expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ (7.2)	$ (6.4)