Note 3 - Restructuring Activities (Details Textual) - USD ($) $ in Millions	3 Months Ended		45 Months Ended
	Aug. 28, 2022	Aug. 29, 2021	Aug. 28, 2022
Restructuring and Related Cost, Expected Cost, Total	$ 148.1		$ 148.1
Restructuring and Related Cost, Incurred Cost	0.6
Conagra Restructuring Plan [Member]
Restructuring And Related Cost, Approved For Incurrence	180.6		180.6
Restructuring And Related Cost, Approved For Incurrence, Cash	53.8		53.8
Restructuring And Related Cost, Approved For Incurrence, Noncash	126.8		126.8
Restructuring and Related Cost, Expected Cost, Total	148.7		148.7
Restructuring And Related Cost Incurred Or Expected, Cash Outflows From Inception	46.8		46.8
Restructuring and Related Cost, Expected Cost, Noncash	101.9		101.9
Restructuring and Related Cost, Incurred Cost	4.1	$ 8.5	146.3
Restructuring And Related Cost Expected. Cash Outflows	44.3
Restructuring And Related Cost Expected, Noncash Charges	102.0
Pinnacle Integration Restructuring Plan [Member]
Restructuring And Related Cost Incurred Or Expected, Cash Outflows From Inception	284.2		284.2
Restructuring and Related Cost, Expected Cost, Noncash	28.0		28.0
Restructuring and Related Cost, Incurred Cost	0.8	$ 7.3	294.1
Restructuring And Related Cost Expected. Cash Outflows	4.2
Restructuring And Related Cost Expected, Noncash Charges	0.1
Restructuring and Related Cost, Expected Cost, Cash	266.1		266.1
Restructuring And Related Cost Incurred, Noncash Charges From Inception	346.4
Restructuring And Related Cost Incurred Or Expected, Non-cash Charges From Inception	$ 62.2
Pinnacle Integration Restructuring Plan [Member] | Cost of Sales [Member]
Restructuring and Related Cost, Incurred Cost			12.7
Pinnacle Integration Restructuring Plan [Member] | Selling, General and Administrative Expenses [Member]
Restructuring and Related Cost, Incurred Cost			$ 281.4