Condensed Consolidated Statements of Earnings - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 23, 2020	Feb. 28, 2021	Feb. 23, 2020
Income Statement [Abstract]
Net sales	$ 2,771.1	$ 2,555.0	$ 8,445.2	$ 7,766.5
Costs and expenses:
Cost of goods sold	2,012.7	1,870.6	5,987.7	5,619.7
Selling, general and administrative expenses	309.7	319.9	967.7	1,090.5
Pension and postretirement non-service income	(13.7)	(16.4)	(41.2)	(37.2)
Interest expense, net	100.6	117.7	322.0	361.8
Income before income taxes and equity method investment earnings	361.8	263.2	1,209.0	731.7
Income tax expense	101.6	68.9	269.0	141.5
Equity method investment earnings	21.5	10.4	51.0	50.3
Net income	281.7	204.7	991.0	640.5
Less: Net income attributable to noncontrolling interests	0.3	0.3	1.7	1.8
Net income attributable to Conagra Brands, Inc.	$ 281.4	$ 204.4	$ 989.3	$ 638.7
Earnings per share — basic
Net income attributable to Conagra Brands, Inc. common stockholders	$ 0.58	$ 0.42	$ 2.03	$ 1.31
Earnings per share — diluted
Net income attributable to Conagra Brands, Inc. common stockholders	$ 0.58	$ 0.42	$ 2.02	$ 1.31