BUSINESS SEGMENTS AND RELATED INFORMATION (Narrative) (Details) $ in Millions	3 Months Ended			12 Months Ended
	May 25, 2014 USD ($)	Nov. 24, 2013 USD ($)	Feb. 24, 2013 USD ($)	May 29, 2016 USD ($) employee segment	May 31, 2015 USD ($)	May 25, 2014 USD ($)	May 27, 2012 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment				2
Cumulative net derivative gains (losses) from economic hedges recognized in corporate				$ 3.2
Net derivative gains (losses) recognized in general corporate expenses				3.6
Derivative gains (losses) to be reclassified to segment operating results thereafter				(0.4)
Expect to reclassify losses in next year				2.4
Expect to reclassify gains				$ 0.8
Number of employees | employee				20,900
Percentage of employees in party to collective bargaining agreements				36.00%
Percentage of employees in party to collective bargaining agreements schedule to expire in next year				31.00%
Foreign net sales, including sales by domestic segments to customers				$ 1,500.0	$ 1,600.0	$ 1,700.0
Percentage of consolidated net sales in consumer food segment accounted by Wal-Mart Stores, Inc. and its affiliates				16.00%	16.00%	17.00%
Percentage of consolidated net receivables in commercial foods accounted by Wal-Mart Stores, Inc. and its affiliates				20.00%	16.00%
Loan purchase under agreement							$ 40.8
Asset impairment charges				$ 62.6	$ 36.0	$ 118.9
Consumer Foods
Segment Reporting Information [Line Items]
Net derivative gains (losses) recognized in general corporate expenses				(18.9)
Commercial Foods
Segment Reporting Information [Line Items]
Net derivative gains (losses) recognized in general corporate expenses				$ (1.4)
Asset impairment charges	$ 5.1	$ 8.9	$ 10.2
Onion Supply Agreement Guarantee
Segment Reporting Information [Line Items]
Guarantee obligation under purchase agreement							$ 25.0