BUSINESS SEGMENTS AND RELATED INFORMATION (Net Derivative Gains (Losses)) (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 25, 2014	May. 26, 2013
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	$ (23.7)
Consumer Foods
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(18.9)
Commercial Foods
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(1.4)
Private Brands
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(5.2)
Commodity contracts
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(108.5)	$ 24.4	$ 73.1
Commodity contracts | General corporate expenses
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(50.2)	36.8	49.0
Commodity contracts | Reporting segments
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(58.3)	(12.4)	24.1
Commodity contracts | Consumer Foods
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(41.9)	(5.9)	26.7
Commodity contracts | Commercial Foods
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(4.7)	4.3	(3.6)
Commodity contracts | Private Brands
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	$ (11.7)	$ (10.8)	$ 1.0