BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Net Derivative Gains (Losses) from Economic Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2017	May 29, 2016	May 31, 2015
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	$ (3.3)
Commodity contracts
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	0.6	$ (7.4)	$ (70.8)
Commodity contracts | Reporting segments
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	5.7	(23.8)	(46.2)
Commodity contracts | Reporting segments | Grocery & Snacks
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	3.4	(14.4)	(26.7)
Commodity contracts | Reporting segments | Refrigerated & Frozen
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	0.8	(6.2)	(11.8)
Commodity contracts | Reporting segments | International
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	1.6	(0.5)	(4.0)
Commodity contracts | Reporting segments | Foodservice
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	0.0	(1.0)	(3.4)
Commodity contracts | Reporting segments | Commercial
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(0.1)	(1.7)	(0.3)
Commodity contracts | Net derivative gains (losses) recognized in general corporate expenses
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	$ (5.1)	$ 16.4	$ (24.6)