Note 2 - Restructuring Activities (Details Textual) - USD ($) $ in Millions	12 Months Ended			42 Months Ended
	May 29, 2022	May 30, 2021	May 31, 2020	May 29, 2022
Restructuring and Related Cost, Expected Cost, Total	$ 147.8			$ 147.8
Restructuring and Related Cost, Incurred Cost	0.6
Pinnacle Integration Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	346.9			346.9
Restructuring And Related Cost Incurred Or Expected, Cash Outflows From Inception	284.3
Restructuring And Related Cost Incurred Or Expected, Non-cash Charges From Inception	62.6
Restructuring and Related Cost, Incurred Cost	19.6	$ 31.7	$ 73.8	293.3
Restructuring And Related Cost Expected. Cash Outflows	24.0
Restructuring And Related Cost Expected, Noncash Benefit	4.4
Restructuring And Related Cost Incurred, Cash Outflows From Inception	264.9
Restructuring And Related Cost Incurred, Noncash Charges From Inception	28.4
Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	148.4			148.4
Restructuring and Related Cost, Incurred Cost	29.4	$ 46.2	$ 64.4	142.2
Restructuring And Related Cost Expected. Cash Outflows	16.0
Restructuring And Related Cost Incurred, Cash Outflows From Inception	40.1
Restructuring And Related Cost Incurred, Noncash Charges From Inception	102.1
Restructuring And Related Cost, Approved For Incurrence	180.6
Restructuring And Related Cost, Approved For Incurrence, Cash	53.8
Restructuring And Related Cost, Approved For Incurrence, Noncash	126.8
Restructuring and Related Cost, Expected Cost, Cash	46.4			46.4
Restructuring and Related Cost, Expected Cost, Noncash	102.0			$ 102.0
Restructuring And Related Cost Expected, Noncash Charges	$ 13.4