Note 3 - Restructuring Activities - Restructuring Plan Expenses (Details) - 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
Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total	10.9		10.9
Restructuring and Related Cost, Incurred Cost
Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	148.7		148.7
Restructuring and Related Cost, Incurred Cost	4.1	$ 8.5	146.3
Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total
Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	72.8		72.8
Restructuring and Related Cost, Incurred Cost			72.8
Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	11.2		11.2
Restructuring and Related Cost, Incurred Cost	0.2		11.2
Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost	0.0		0.0
Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	84.0		84.0
Restructuring and Related Cost, Incurred Cost	0.2		84.0
Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost	0.0		0.0
Severance And Related Costs [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	19.2		19.2
Restructuring and Related Cost, Incurred Cost	0.2		19.0
Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total	4.7		4.7
Restructuring and Related Cost, Incurred Cost	0.0		4.4
Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	0.6		0.6
Restructuring and Related Cost, Incurred Cost	0.1		0.6
Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total	0.1		0.1
Restructuring and Related Cost, Incurred Cost	0.0		0.1
Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	22.8		22.8
Restructuring and Related Cost, Incurred Cost			22.8
Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	5.6		5.6
Restructuring and Related Cost, Incurred Cost	3.0		4.7
Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total	5.6		5.6
Restructuring and Related Cost, Incurred Cost	3.0		4.7
Other Net [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	15.9		15.9
Restructuring and Related Cost, Incurred Cost	0.6		14.6
Other Net [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total	0.5		0.5
Restructuring and Related Cost, Incurred Cost	0.1		0.4
Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Expected Cost, Total	64.1		64.1
Restructuring and Related Cost, Incurred Cost	3.9		61.7
Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Expected Cost, Total	10.9		10.9
Restructuring and Related Cost, Incurred Cost	3.1		9.6
Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost	4.1		145.7
Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Incurred Cost	3.1		9.6
Pension And Postretirement Nonservice Cost Income Member | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			0.6
Grocery And Snacks [Member]
Restructuring and Related Cost, Expected Cost, Total	88.8		88.8
Restructuring and Related Cost, Incurred Cost
Grocery And Snacks [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total
Grocery And Snacks [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	33.2		33.2
Restructuring and Related Cost, Incurred Cost			33.2
Grocery And Snacks [Member] | Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	8.7		8.7
Restructuring and Related Cost, Incurred Cost	0.0		8.7
Grocery And Snacks [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	41.9		41.9
Restructuring and Related Cost, Incurred Cost	0.0		41.9
Grocery And Snacks [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	11.7		11.7
Restructuring and Related Cost, Incurred Cost	0.1		11.7
Grocery And Snacks [Member] | Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.5		0.5
Restructuring and Related Cost, Incurred Cost	0.1		0.5
Grocery And Snacks [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	21.9		21.9
Restructuring and Related Cost, Incurred Cost			21.9
Grocery And Snacks [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost	0.0		0.0
Grocery And Snacks [Member] | Other Net [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	12.8		12.8
Restructuring and Related Cost, Incurred Cost	0.1		12.7
Grocery And Snacks [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	46.9		46.9
Restructuring and Related Cost, Incurred Cost	0.3		46.8
Grocery And Snacks [Member] | Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost	0.3		88.7
Refrigerated And Frozen [Member]
Restructuring and Related Cost, Expected Cost, Total	46.7		46.7
Restructuring and Related Cost, Incurred Cost
Refrigerated And Frozen [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total
Refrigerated And Frozen [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	39.6		39.6
Restructuring and Related Cost, Incurred Cost			39.6
Refrigerated And Frozen [Member] | Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	2.5		2.5
Restructuring and Related Cost, Incurred Cost	0.2		2.5
Refrigerated And Frozen [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	42.1		42.1
Restructuring and Related Cost, Incurred Cost	0.2		42.1
Refrigerated And Frozen [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	1.2		1.2
Restructuring and Related Cost, Incurred Cost	0.1		1.3
Refrigerated And Frozen [Member] | Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost	0.0		0.0
Refrigerated And Frozen [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.8		0.8
Restructuring and Related Cost, Incurred Cost			0.8
Refrigerated And Frozen [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost	0.0		0.0
Refrigerated And Frozen [Member] | Other Net [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	2.6		2.6
Restructuring and Related Cost, Incurred Cost	0.4		1.5
Refrigerated And Frozen [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	4.6		4.6
Restructuring and Related Cost, Incurred Cost	0.5		3.6
Refrigerated And Frozen [Member] | Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost	0.7		45.7
International [Member]
Restructuring and Related Cost, Expected Cost, Total	1.4		1.4
Restructuring and Related Cost, Incurred Cost
International [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total
International [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
International [Member] | Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
International [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
International [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	1.3		1.3
Restructuring and Related Cost, Incurred Cost			1.3
International [Member] | Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
International [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.1		0.1
Restructuring and Related Cost, Incurred Cost			0.1
International [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
International [Member] | Other Net [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
International [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	1.4		1.4
Restructuring and Related Cost, Incurred Cost			1.4
International [Member] | Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			1.4
Foodservice [Member]
Restructuring and Related Cost, Expected Cost, Total	0.3		0.3
Restructuring and Related Cost, Incurred Cost
Foodservice [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total
Foodservice [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
Foodservice [Member] | Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
Foodservice [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
Foodservice [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.3		0.3
Restructuring and Related Cost, Incurred Cost			0.3
Foodservice [Member] | Contract And Lease Termination Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
Foodservice [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
Foodservice [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
Foodservice [Member] | Other Net [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	0.0		0.0
Restructuring and Related Cost, Incurred Cost			0.0
Foodservice [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Expected Cost, Total	$ 0.3		0.3
Restructuring and Related Cost, Incurred Cost			0.3
Foodservice [Member] | Cost Of Goods Sold And Selling General And Administrative Expenses Member | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			$ 0.3