Note 19 - Business Segments and Related Information - Presentation of Derivative Gains (Losses) from Economic Hedges of Forecasted Cash Flows in Segment Results (Details) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	12 Months Ended
	May 29, 2022	May 30, 2021	May 31, 2020
Net derivative gains (losses)	$ 37.1	$ 9.5	$ (12.9)
Operating Segments [Member]
Net derivative gains (losses)	32.7	(6.1)	(7.4)
Operating Segments [Member] | Grocery And Snacks [Member]
Net derivative gains (losses)	17.3	(2.3)	(4.7)
Operating Segments [Member] | Refrigerated And Frozen [Member]
Net derivative gains (losses)	17.4	(1.7)	(2.5)
Operating Segments [Member] | International [Member]
Net derivative gains (losses)	(3.6)	(1.7)	0.1
Operating Segments [Member] | Foodservice [Member]
Net derivative gains (losses)	1.6	(0.4)	(0.3)
Segment Reconciling Items [Member]
Net derivative gains (losses)	$ 4.4	$ 15.6	$ (5.5)