Note 7 - Derivative Financial Instruments - Net Derivative Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 26, 2023	Nov. 27, 2022	Nov. 26, 2023	Nov. 27, 2022
Net derivative gains (losses)	$ (10.0)	$ 5.2	$ 9.5	$ 14.7
Operating Segments [Member]
Net derivative gains (losses)	1.2	7.6	(6.9)	16.6
Operating Segments [Member] | Grocery And Snacks [Member]
Net derivative gains (losses)	0.7	2.5	(3.2)	7.5
Operating Segments [Member] | Refrigerated And Frozen [Member]
Net derivative gains (losses)	2.1	4.3	(0.2)	7.6
Operating Segments [Member] | International [Member]
Net derivative gains (losses)	(2.0)	0.6	(3.6)	0.7
Operating Segments [Member] | Foodservice [Member]
Net derivative gains (losses)	0.4	0.2	0.1	0.8
Corporate, Non-Segment [Member]
Net derivative gains (losses)	$ (11.2)	$ (2.4)	$ 16.4	$ (1.9)