Note 3 - Restructuring Activities - Restructuring Plan Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		69 Months Ended
	Feb. 25, 2024	Feb. 26, 2023	Feb. 25, 2024	Feb. 26, 2023	Feb. 25, 2024
Restructuring and Related Cost, Incurred Cost			$ 28.9
Corporate, Non-Segment [Member]
Restructuring and Related Cost, Incurred Cost			0.1
Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost	$ 1.5	$ 1.6	28.9	$ 7.5	$ 181.8
Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			6.2
Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Incurred Cost			0.0
Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			1.8
Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Incurred Cost			0.0
Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			8.0
Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Incurred Cost			0.0
Severance And Related Costs [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			5.0
Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Incurred Cost			0.0
Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			14.7
Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Incurred Cost			0.0
Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			0.3
Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Incurred Cost			0.0
Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			0.9
Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Incurred Cost			0.1
Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			20.9
Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member] | Corporate, Non-Segment [Member]
Restructuring and Related Cost, Incurred Cost			0.1
Grocery And Snacks [Member]
Restructuring and Related Cost, Incurred Cost			7.5
Grocery And Snacks [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			6.0
Grocery And Snacks [Member] | Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			0.0
Grocery And Snacks [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			6.0
Grocery And Snacks [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			0.7
Grocery And Snacks [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			0.6
Grocery And Snacks [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			0.2
Grocery And Snacks [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			0.0
Grocery And Snacks [Member] | Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			1.5
Refrigerated And Frozen [Member]
Restructuring and Related Cost, Incurred Cost			1.1
Refrigerated And Frozen [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			0.2
Refrigerated And Frozen [Member] | Other Cost of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			0.0
Refrigerated And Frozen [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			0.2
Refrigerated And Frozen [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			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, Incurred Cost			0.0
Refrigerated And Frozen [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			0.1
Refrigerated And Frozen [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			0.8
Refrigerated And Frozen [Member] | Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			0.9
International [Member]
Restructuring and Related Cost, Incurred Cost			20.2
International [Member] | Accelerated Depreciation Related To Cost Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
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, Incurred Cost			1.8
International [Member] | Costs Of Goods Sold [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			1.8
International [Member] | Severance And Related Costs [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			4.3
International [Member] | Asset Impairment Net Of Gains On Disposal [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			14.1
International [Member] | Consulting And Professional Fees [Member] | Conagra Restructuring Plan [Member] | Operating Segments [Member]
Restructuring and Related Cost, Incurred Cost			0.0
International [Member] | Other Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			0.0
International [Member] | Selling, General and Administrative Expenses [Member] | Conagra Restructuring Plan [Member]
Restructuring and Related Cost, Incurred Cost			$ 18.4