BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Net Derivative Gains (Losses) from Economic Hedges (Details) - USD ($) $ in Millions	12 Months Ended
	May 26, 2019	May 27, 2018	May 28, 2017
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	$ 1.0	$ 0.4
Commodity contracts
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(3.6)	(0.9)	$ 0.6
Commodity contracts | Reporting segments
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(1.8)	(7.1)	5.7
Commodity contracts | Reporting segments | Grocery & Snacks
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(2.1)	0.2	3.4
Commodity contracts | Reporting segments | Refrigerated & Frozen
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(1.1)	(0.3)	0.8
Commodity contracts | Reporting segments | International
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	2.8	(6.9)	1.6
Commodity contracts | Reporting segments | Foodservice
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(0.6)	(0.1)	0.0
Commodity contracts | Reporting segments | Pinnacle Foods
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	(0.8)	0.0	0.0
Commodity contracts | Reporting segments | Commercial
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	0.0	0.0	(0.1)
Commodity contracts | Net derivative gains (losses) recognized in general corporate expenses
Segment Reporting Information [Line Items]
Net derivative gains (losses) incurred	$ (1.8)	$ 6.2	$ (5.1)