Note 2 - Restructuring Activities (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		51 Months Ended
	Feb. 26, 2023	Feb. 27, 2022	Feb. 26, 2023	Feb. 27, 2022	Feb. 26, 2023
Restructuring and Related Cost, Expected Cost, Total	$ 153.8		$ 153.8		$ 153.8
Restructuring and Related Cost, Incurred Cost					0.6
Conagra Restructuring Plan [Member]
Restructuring And Related Cost, Approved For Incurrence	185.0		185.0		185.0
Restructuring And Related Cost, Approved For Incurrence, Cash	57.2		57.2		57.2
Restructuring And Related Cost, Approved For Incurrence, Noncash	127.8		127.8		127.8
Restructuring and Related Cost, Expected Cost, Total	154.4		154.4		154.4
Restructuring And Related Cost Incurred Or Expected, Cash Outflows From Inception	51.4		51.4		51.4
Restructuring And Related Cost Incurred Or Expected, Non-cash Charges From Inception	103.0
Restructuring and Related Cost, Incurred Cost	1.6	$ 10.5	7.5	$ 25.6	149.7
Restructuring And Related Cost Expected. Cash Outflows	1.3		7.2		47.4
Restructuring and Related Cost, Expected Cost, Noncash	0.3		0.3		0.3
Restructuring And Related Cost Expected, Noncash Charges					102.3
Pinnacle Integration Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	346.4		346.4		346.4
Restructuring And Related Cost Incurred Or Expected, Cash Outflows From Inception	284.7		284.7		284.7
Restructuring And Related Cost Incurred Or Expected, Non-cash Charges From Inception					61.7
Restructuring and Related Cost, Incurred Cost	0.9	$ 0.2	1.7	$ 13.3	295.0
Restructuring and Related Cost, Expected Cost, Noncash	28.1		28.1		28.1
Restructuring and Related Cost, Expected Cost, Cash	$ 266.9		$ 266.9		266.9
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					$ 282.0