Note 2 - Restructuring Activities (Details Textual) - USD ($) $ in Millions	12 Months Ended			59 Months Ended
	May 28, 2023	May 29, 2022	May 30, 2021	May 28, 2023
Restructuring and Related Cost, Expected Cost	$ 155.7			$ 155.7
Restructuring and Related Cost, Incurred Cost				0.6
Conagra Restructuring Plan [Member]
Restructuring And Related Cost, Approved For Incurrence	186.4			186.4
Restructuring And Related Cost, Approved For Incurrence, Cash	58.6			58.6
Restructuring And Related Cost, Approved For Incurrence, Noncash	127.8			127.8
Restructuring and Related Cost, Expected Cost	156.3			156.3
Restructuring And Related Cost Incurred Or Expected, Cash Outflows From Inception	53.0			53.0
Restructuring And Related Cost Incurred Or Expected, Non-cash Charges From Inception	103.3
Restructuring and Related Cost, Incurred Cost	10.7	$ 29.4	$ 46.2	152.9
Restructuring And Related Cost Expected, Cash Outflows	9.6			49.8
Restructuring and Related Cost, Expected Cost, Noncash	1.1			1.1
Restructuring And Related Cost Expected, Noncash Charges				103.1
Pinnacle Integration Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost	340.7			340.7
Restructuring and Related Cost, Incurred Cost	2.4	$ 19.6	$ 31.7	295.7
Restructuring and Related Cost, Expected Cost, Noncash	60.6			60.6
Restructuring and Related Cost, Expected Cost, Cash	$ 280.1			280.1
Pinnacle Integration Restructuring Plan [Member] | Cash Charges [Member]
Restructuring and Related Cost, Incurred Cost				267.6
Pinnacle Integration Restructuring Plan [Member] | Non-cash Charges [Member]
Restructuring and Related Cost, Incurred Cost				28.1
Pinnacle Integration Restructuring Plan [Member] | Cost of Sales [Member]
Restructuring and Related Cost, Incurred Cost				13.0
Pinnacle Integration Restructuring Plan [Member] | Selling, General and Administrative Expenses [Member]
Restructuring and Related Cost, Incurred Cost				$ 282.7