BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Net Derivative Gains (Losses) from Economic Hedges (Details) - Commodity contracts - USD ($) $ in Millions	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	$ (0.9)	$ 0.6	$ (7.4)
Reporting segments
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(7.1)	5.7	(23.8)
Reporting segments | Grocery & Snacks
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	0.2	3.4	(14.4)
Reporting segments | Refrigerated & Frozen
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(0.3)	0.8	(6.2)
Reporting segments | International
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(6.9)	1.6	(0.5)
Reporting segments | Foodservice
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(0.1)	0.0	(1.0)
Reporting segments | Commercial
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	0.0	(0.1)	(1.7)
Net derivative gains (losses) recognized in general corporate expenses
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	$ 6.2	$ (5.1)	$ 16.4