CONTINGENCIES (Details) $ in Millions			3 Months Ended			12 Months Ended
	Mar. 25, 2016 USD ($)	Jan. 27, 2014 USD ($) defendant	Nov. 23, 2014 USD ($)	Aug. 24, 2014 USD ($)	May 25, 2014 USD ($)	May 29, 2016 USD ($) site	May 26, 2013 USD ($)	May 27, 2012 USD ($)	May 31, 2015 USD ($)
Guarantor Obligations [Line Items]
Possible loss contingency amount						$ 11.2
Reserves for Beatrice environmental matters						55.8			$ 55.0
Face value of federal income tax credits						$ 26.7
Dispute coverage charge with insurance carrier							$ 7.5	$ 17.5
Reduction to accrual			$ 1.2	$ 5.8	$ 6.7
Contingent put options general exercise period						30 days
Accrued put cost						$ 108.9			0.0
Lamb Weston Meijer
Guarantor Obligations [Line Items]
Ownership percentage						50.00%
Total liabilities						$ 203.7			129.1
Partners' equity						$ 284.5			$ 255.9
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
Beatrice | CALIFORNIA
Guarantor Obligations [Line Items]
Other defendants | defendant		2
Possible loss contingency amount		$ 1,150.0
Potato Supply Agreement Guarantee
Guarantor Obligations [Line Items]
Amount of supplier loans effectively guaranteed						$ 40.5
Judicial Ruling
Guarantor Obligations [Line Items]
Damages awarded	$ 108.9
Loss on Lease Put Option
Guarantor Obligations [Line Items]
Estimate of possible loss						58.5
Accrued put cost						$ 9.3