Note 6 - Derivative Financial Instruments - Net Derivative Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 27, 2023	Aug. 28, 2022
Net derivative gains (losses)	$ 19.5	$ 9.5
Operating Segments [Member]
Net derivative gains (losses)	(8.1)	9.0
Operating Segments [Member] | Grocery And Snacks [Member]
Net derivative gains (losses)	(3.9)	5.0
Operating Segments [Member] | Refrigerated And Frozen [Member]
Net derivative gains (losses)	(2.3)	3.3
Operating Segments [Member] | International [Member]
Net derivative gains (losses)	(1.6)	0.1
Operating Segments [Member] | Foodservice [Member]
Net derivative gains (losses)	(0.3)	0.6
Corporate, Non-Segment [Member]
Net derivative gains (losses)	$ 27.6	$ 0.5