Note 7 - Derivative Financial Instruments - Net Derivative Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 25, 2024	Feb. 26, 2023	Feb. 25, 2024	Feb. 26, 2023
Net derivative gains (losses)	$ (8.3)	$ (16.8)	$ 1.2	$ (2.1)
Operating Segments [Member]
Net derivative gains (losses)	(1.5)	5.9	(8.4)	22.5
Operating Segments [Member] | Grocery And Snacks [Member]
Net derivative gains (losses)	(0.6)	1.0	(3.8)	8.5
Operating Segments [Member] | Refrigerated And Frozen [Member]
Net derivative gains (losses)	(0.2)	3.0	(0.4)	10.6
Operating Segments [Member] | International [Member]
Net derivative gains (losses)	(0.7)	1.5	(4.3)	2.2
Operating Segments [Member] | Foodservice [Member]
Net derivative gains (losses)	0.0	0.4	0.1	1.2
Corporate, Non-Segment [Member]
Net derivative gains (losses)	$ (6.8)	$ (22.7)	$ 9.6	$ (24.6)