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		9 Months Ended
	Feb. 22, 2015	Feb. 23, 2014	Feb. 22, 2015	Feb. 23, 2014
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net			$ (101.3)
Consumer Foods
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(20.9)		(18.6)
Private Brands
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(5.7)		(5.1)
Commodity contracts
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(40.1)	42.6	(101.3)	13.1
Commodity contracts | Consumer Foods
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(30.9)	(4.4)	(26.7)	(3.1)
Commodity contracts | Commercial Foods
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(4.8)	0.5	1.2	0.9
Commodity contracts | Private Brands
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(10.5)	(5.9)	(6.7)	(7.2)
Operating Segments | Commodity contracts
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(46.2)	(9.8)	(32.2)	(9.4)
Segment Reconciling Items | Commodity contracts
Operating Statistics [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 6.1	$ 52.4	$ (69.1)	$ 22.5