GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS (Change in Carrying Amount of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 25, 2013
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 8,444.1
Currency translation and purchase accounting adjustments	(27.1)
Goodwill, Ending Balance	8,417.0
Consumer Foods
Goodwill [Line Items]
Goodwill, Beginning Balance	3,966.4
Currency translation and purchase accounting adjustments	(18.8)
Goodwill, Ending Balance	3,947.6
Commercial Foods
Goodwill [Line Items]
Goodwill, Beginning Balance	128.9
Currency translation and purchase accounting adjustments	0.3
Goodwill, Ending Balance	129.2
Ralcorp
Goodwill [Line Items]
Goodwill, Beginning Balance	4,348.8
Currency translation and purchase accounting adjustments	(8.6)
Goodwill, Ending Balance	$ 4,340.2