Consolidated Statements of Earnings - USD ($) $ in Millions	12 Months Ended
	May 30, 2021	May 31, 2020	May 26, 2019
Income Statement [Abstract]
Net sales	$ 11,184.7	$ 11,054.4	$ 9,538.4
Costs and expenses:
Cost of goods sold	8,005.5	7,984.8	6,885.4
Selling, general and administrative expenses	1,403.0	1,622.5	1,473.4
Pension and postretirement non-service income	(54.5)	(9.9)	(35.1)
Interest expense, net	420.4	487.1	391.4
Income from continuing operations before income taxes and equity method investment earnings	1,410.3	969.9	823.3
Income tax expense	193.8	201.3	218.8
Equity method investment earnings	84.4	73.2	75.8
Income from continuing operations	1,300.9	841.8	680.3
Loss from discontinued operations, net of tax	0.0	0.0	(1.9)
Net income	1,300.9	841.8	678.4
Less: Net income attributable to noncontrolling interests	2.1	1.7	0.1
Net income attributable to Conagra Brands, Inc.	$ 1,298.8	$ 840.1	$ 678.3
Earnings per share — basic
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders	$ 2.67	$ 1.72	$ 1.53
Income from discontinued operations attributable to Conagra Brands, Inc. common stockholders	0	0	0
Net income attributable to Conagra Brands, Inc. common stockholders	2.67	1.72	1.53
Earnings per share — diluted
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders	2.66	1.72	1.53
Loss from discontinued operations attributable to Conagra Brands, Inc. common stockholders	0	0	(0.01)
Net income attributable to Conagra Brands, Inc. common stockholders	$ 2.66	$ 1.72	$ 1.52