BUSINESS SEGMENTS AND RELATED INFORMATION (Narrative) (Details) $ in Millions	12 Months Ended
	May. 31, 2015 USD ($) employee Segment	May. 25, 2014 USD ($)	May. 26, 2013 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3
Cumulative net derivative losses from economic hedges recognized in corporate	$ 23.3
Net derivative losses recognized in general corporate expenses	23.7
Derivative gains to be reclassified to segment operating results thereafter	0.4
Expect to reclassify losses in next year	23.5
Expect to reclassify gains	$ 0.2
Number of employees | employee	32,900
Percentage of employees in party to collective bargaining agreements	32.00%
Percentage of employees in party to collective bargaining agreements schedule to expire in next year	25.00%
Foreign net sales, including sales by domestic segments to customers	$ 1,900.0	$ 2,000.0	$ 1,700.0
Percentage of consolidated net sales in consumer food segment accounted by Wal-Mart Stores, Inc. and its affiliates	18.00%	19.00%	20.00%
Percentage of consolidated net receivables in commercial foods accounted by Wal-Mart Stores, Inc. and its affiliates	16.00%	16.00%
Consumer Foods
Segment Reporting Information [Line Items]
Net derivative losses recognized in general corporate expenses	$ 18.9
Private Brands
Segment Reporting Information [Line Items]
Net derivative losses recognized in general corporate expenses	5.2
Commercial Foods
Segment Reporting Information [Line Items]
Net derivative losses recognized in general corporate expenses	$ 1.4