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. 26, 2018	Aug. 27, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative losses incurred	$ (6.2)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative losses incurred	(6.5)	$ (7.4)
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative losses incurred	(0.1)	(1.4)
Commodity contracts | Reporting segments | Net derivative losses allocated to Grocery & Snacks
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative losses incurred	(0.2)	(0.6)
Commodity contracts | Reporting segments | Net derivative losses allocated to Refrigerated & Frozen
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative losses incurred	(0.1)	0.0
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to International
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative losses incurred	0.3	(0.7)
Commodity contracts | Reporting segments | Net derivative losses allocated to Foodservice
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative losses incurred	(0.1)	(0.1)
Commodity contracts | Net derivative losses recognized in general corporate expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative losses incurred	$ (6.4)	$ (6.0)