BUSINESS SEGMENTS AND RELATED INFORMATION (Allocation of Net Derivative Gains (Losses) from Economic Hedges of Forecasted Commodity Consumption and Foreign Currency Risk) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 23, 2014	Nov. 24, 2013	Nov. 23, 2014	Nov. 24, 2013
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net			$ (61.2)
Consumer Foods
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2.3
Private Brands
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0.6
Commodity contracts
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(22.9)	(11.4)	(61.2)	(29.5)
Commodity contracts | Consumer Foods
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0.5	(0.6)	4.2	1.3
Commodity contracts | Commercial Foods
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	3.0	(1.2)	6.0	0.4
Commodity contracts | Private Brands
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1.5)	(0.6)	3.8	(1.3)
Operating Segments | Commodity contracts
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2.0	(2.4)	14.0	0.4
Segment Reconciling Items | Commodity contracts
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (24.9)	$ (9.0)	$ (75.2)	$ (29.9)