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. 26, 2017	Nov. 27, 2016	Nov. 26, 2017	Nov. 27, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred			$ (0.6)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	$ 3.0	$ 3.0	(4.4)	$ 2.7
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(4.1)	3.8	(5.5)	2.8
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to Grocery & Snacks
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(0.4)	2.4	(1.0)	2.0
Commodity contracts | Reporting segments | Net derivative gains allocated to Refrigerated & Frozen
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	0.1	0.7	0.1	0.5
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to International
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(3.7)	0.2	(4.4)	0.2
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to Foodservice
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(0.1)	0.5	(0.2)	0.2
Commodity contracts | Reporting segments | Net derivative losses allocated to Commercial
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	0.0	0.0	0.0	(0.1)
Commodity contracts | Net derivative gains (losses) recognized in general corporate expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	$ 7.1	$ (0.8)	$ 1.1	$ (0.1)