Condensed Consolidated Statements of Earnings - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 27, 2022	Feb. 28, 2021	Feb. 27, 2022	Feb. 28, 2021
Income Statement [Abstract]
Net sales	$ 2,913.7	$ 2,771.1	$ 8,625.9	$ 8,445.2
Costs and expenses:
Cost of goods sold	2,216.5	2,012.7	6,500.5	5,987.7
Selling, general and administrative expenses	338.0	309.7	993.5	967.7
Pension and postretirement non-service income	(16.1)	(13.7)	(48.3)	(41.2)
Interest expense, net	94.6	100.6	283.7	322.0
Income before income taxes and equity method investment earnings	280.7	361.8	896.5	1,209.0
Income tax expense	109.9	101.6	263.8	269.0
Equity method investment earnings	48.1	21.5	97.8	51.0
Net income	218.9	281.7	730.5	991.0
Less: Net income attributable to noncontrolling interests	0.5	0.3	1.2	1.7
Net income attributable to Conagra Brands, Inc.	$ 218.4	$ 281.4	$ 729.3	$ 989.3
Earnings per share — basic
Net income attributable to Conagra Brands, Inc. common stockholders	$ 0.45	$ 0.58	$ 1.52	$ 2.03
Earnings per share — diluted
Net income attributable to Conagra Brands, Inc. common stockholders	$ 0.45	$ 0.58	$ 1.51	$ 2.02