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		9 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred			$ 2.3
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	$ 0.3	$ (3.3)	3.0	$ (13.1)
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(0.2)	(5.1)	2.6	(15.1)
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to Grocery & Snacks
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	0.1	(3.1)	2.0	(8.8)
Commodity contracts | Reporting segments | Net derivative losses allocated to Refrigerated & Frozen
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(0.8)	(1.3)	(0.3)	(3.9)
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to International
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	0.6	(0.3)	0.9	(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)	0.1	0.1	(0.7)
Commodity contracts | Reporting segments | Net derivative losses allocated to Commercial
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	0.0	(0.5)	(0.1)	(1.5)
Commodity contracts | Net derivative gains recognized in general corporate expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	$ 0.5	$ 1.8	$ 0.4	$ 2.0