BUSINESS SEGMENTS AND RELATED INFORMATION - Schedule of Net Derivative Gains (Losses) from Economic Hedges of Forecasted Commodity Consumption and Foreign Currency Risk (Details) - USD ($) $ in Millions	12 Months Ended
	May 30, 2021	May 31, 2020	May 26, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	$ 13.5
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	9.5	$ (12.9)	$ (3.6)
Commodity contracts | Reporting segments
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(6.1)	(7.4)	(1.8)
Commodity contracts | Reporting segments | Net derivative losses allocated to Grocery & Snacks
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(2.3)	(4.7)	(2.5)
Commodity contracts | Reporting segments | Net derivative losses allocated to Refrigerated & Frozen
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(1.7)	(2.5)	(1.5)
Commodity contracts | Reporting segments | Net derivative gains (losses) allocated to International
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(1.7)	0.1	2.8
Commodity contracts | Reporting segments | Net derivative losses allocated to Foodservice
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	(0.4)	(0.3)	(0.6)
Commodity contracts | Corporate
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains (losses) incurred	$ 15.6	$ (5.5)	$ (1.8)