Note 14 - Business Segments and Related Information - Presentation of Derivative Gain (Losses) from Economic Hedges of Forecasted Cash Flows in Segment Results (Details) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 26, 2023	Feb. 27, 2022	Feb. 26, 2023	Feb. 27, 2022
Net derivative gains (losses)	$ (16.8)	$ 10.0	$ (2.1)	$ 27.2
Operating Segments [Member]
Net derivative gains (losses)	5.9	8.1	22.5	21.9
Operating Segments [Member] | Grocery And Snacks [Member]
Net derivative gains (losses)	1.0	3.9	8.5	11.8
Operating Segments [Member] | Refrigerated And Frozen [Member]
Net derivative gains (losses)	3.0	3.6	10.6	12.9
Operating Segments [Member] | International [Member]
Net derivative gains (losses)	1.5	0.3	2.2	(3.6)
Operating Segments [Member] | Foodservice [Member]
Net derivative gains (losses)	0.4	0.3	1.2	0.8
Segment Reconciling Items [Member]
Net derivative gains (losses)	$ (22.7)	$ 1.9	$ (24.6)	$ 5.3