CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						12 Months Ended					3 Months Ended			12 Months Ended			12 Months Ended	3 Months Ended	1 Months Ended
	May 26, 2013	Feb. 24, 2013	Nov. 25, 2012	Aug. 26, 2012	May 27, 2012	May 29, 2011	May 26, 2013 hog	May 27, 2012	May 29, 2011	May 30, 2009	May 31, 2012	Aug. 26, 2012 Litigation Matter	Aug. 26, 2012 Compensatory Damages	Aug. 26, 2012 Punitive Damages	May 26, 2013 Beatrice site	May 26, 2013 Potato Supply Agreement Guarantee	May 26, 2013 Onion Supply Agreement Guarantee	May 26, 2013 Leases and Other Commercial Obligations Guarantee	Aug. 26, 2012 Threatened Litigation Damage from Fire, Explosion or Other Hazard employee	Apr. 30, 2010 Subcontractor Pending Litigation Damage from Fire, Explosion or Other Hazard employee	Apr. 30, 2010 Primary Contractor Pending Litigation Damage from Fire, Explosion or Other Hazard employee
Guarantor Obligations [Line Items]
Number of sites under environmental matters for which acquired company has a liability															36
Number of sites under environmental matters for which acquired company is making payments															32
Reserves for Beatrice environmental matters	$ 65.8				$ 71.2		$ 65.8	$ 71.2							$ 63.3
Maximum period expected for disbursements on environmental matters															18 years
Maximum period of guarantee																		3 years
Guarantee obligation under purchase agreement																	25.0	8.1
Minimum quantity of hogs to be purchased under hog purchase agreement through 2014							1,200,000
Amount of supplier loans effectively guaranteed																40.1
Loan purchase under agreement					40.8			40.8
Asset impairment charges		10.2					20.2	8.6	19.8
Face value of federal income tax credits	21.2						21.2
Dispute coverage charge with insurance carrier								17.5		24.8		7.5
Favorable claim related to defense cost			1.4		11.8	13.2
Favorable claim for disputed coverage					25.0
Proceeds from Legal Settlements	25.0
Gain (Loss) Related to Litigation Settlement	25.0
Number of plaintiffs																			3	2	1
Unfavorable verdict													77.5	100.0
Punitive award against the company				7
Damages accrued in prior period											$ 3