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 28, 2023	May 29, 2022	May 30, 2021
Net derivative gains (losses)	$ (17.6)	$ 37.1	$ 9.5
Operating Segments [Member]
Net derivative gains (losses)	19.5	32.7	(6.1)
Operating Segments [Member] | Grocery And Snacks [Member]
Net derivative gains (losses)	6.0	17.3	(2.3)
Operating Segments [Member] | Refrigerated And Frozen [Member]
Net derivative gains (losses)	9.6	17.4	(1.7)
Operating Segments [Member] | International [Member]
Net derivative gains (losses)	2.5	(3.6)	(1.7)
Operating Segments [Member] | Foodservice [Member]
Net derivative gains (losses)	1.4	1.6	(0.4)
Segment Reconciling Items [Member]
Net derivative gains (losses)	$ (37.1)	$ 4.4	$ 15.6