CONTINGENCIES (Details) $ in Millions		3 Months Ended				12 Months Ended
	Jan. 27, 2014 USD ($) defendant	Aug. 30, 2015 USD ($) site	Nov. 23, 2014 USD ($)	Aug. 24, 2014 USD ($)	May. 25, 2014 USD ($)	May. 26, 2013 USD ($)	May. 27, 2012 USD ($)	May. 31, 2015 USD ($)
Guarantor Obligations [Line Items]
Face value of federal income tax credits		$ 26.7
Accrual reduction			$ 1.2	$ 5.8	$ 6.7
Liabilities		$ 12,389.9						$ 12,932.2
Contingent put options general exercise period		30 days
Litigation matter
Guarantor Obligations [Line Items]
Dispute coverage charge with insurance carrier						$ 7.5	$ 17.5
Beatrice
Guarantor Obligations [Line Items]
Number of sites under environmental matters for which acquired company has a liability | site		37
Number of sites under environmental matters for which acquired company is making payments | site		33
Reserves for Beatrice environmental matters		$ 54.0
Maximum period expected for disbursements on environmental matters		18 years
Potato supply agreement guarantee
Guarantor Obligations [Line Items]
Amount of supplier loans effectively guaranteed		$ 58.5
Loss on lease put option
Guarantor Obligations [Line Items]
Estimate of possible loss		103.0
Accrued put cost		5.7
Pending litigation
Guarantor Obligations [Line Items]
Estimate of possible loss		$ 11.2
California | Beatrice
Guarantor Obligations [Line Items]
Other defendants | defendant	2
Expected decision from court	$ 1,150.0
Lamb-Weston/Meijer, V.O.F.
Guarantor Obligations [Line Items]
Ownership interest (as percent)		50.00%
Liabilities		$ 112.4						129.1
Partners' capital		$ 270.4						$ 255.9