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. 25, 2018	Nov. 26, 2017	Nov. 25, 2018	Nov. 26, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred			$ (2.3)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ 2.3	$ 3.0	(4.2)	$ (4.4)
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.5)	(4.1)	(0.6)	(5.5)
Commodity contracts | Reporting segments | Net derivative losses allocated to Grocery & Snacks
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.8)	(0.4)	(1.0)	(1.0)
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to Refrigerated & Frozen
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.4)	0.1	(0.5)	0.1
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to International
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	0.8	(3.7)	1.1	(4.4)
Commodity contracts | Reporting segments | Net derivative losses allocated to Foodservice
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	(0.1)	(0.1)	(0.2)	(0.2)
Commodity contracts | Net derivative gains (losses) recognized in general corporate expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gross derivative gains (losses) incurred	$ 2.8	$ 7.1	$ (3.6)	$ 1.1