BUSINESS SEGMENTS AND RELATED INFORMATION (Allocation 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. 28, 2016	Feb. 22, 2015	Nov. 23, 2014	Feb. 28, 2016	Feb. 22, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)				$ (14.5)
Reporting segments | Consumer Foods
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)		$ (18.6)	$ (20.9)
Reporting segments | Commercial Foods
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)		(1.4)	$ (1.6)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)	$ (5.1)	(31.5)		(20.1)	$ (76.3)
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)	(7.6)	(35.7)		(18.7)	(25.5)
Commodity contracts | Reporting segments | Consumer Foods
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)	(4.6)	(30.9)		(12.9)	(26.7)
Commodity contracts | Reporting segments | Commercial Foods
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)	(3.0)	(4.8)		(5.8)	1.2
Commodity contracts | Segment reconciling items
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses)	$ 2.5	$ 4.2		$ (1.4)	$ (50.8)