Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Income Statement [Abstract]
Net sales	$ 7,938.3	$ 7,826.9	$ 8,664.1
Costs and expenses:
Cost of goods sold	5,586.8	5,484.8	6,234.9
Selling, general and administrative expenses	1,318.0	1,417.1	2,024.6
Interest expense, net	158.7	195.5	295.8
Income from continuing operations before income taxes and equity method investment earnings	874.8	729.5	108.8
Income tax expense	174.6	254.7	46.4
Equity method investment earnings	97.3	71.2	66.1
Income from continuing operations	797.5	546.0	128.5
Income (loss) from discontinued operations, net of tax	14.3	102.0	(794.4)
Net income (loss)	811.8	648.0	(665.9)
Less: Net income attributable to noncontrolling interests	3.4	8.7	11.1
Net income (loss) attributable to Conagra Brands, Inc.	$ 808.4	$ 639.3	$ (677.0)
Earnings (loss) per share — basic
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	$ 1.97	$ 1.26	$ 0.29
Income (loss) from discontinued operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.03	0.22	(1.86)
Net income (loss) attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	2.00	1.48	(1.57)
Earnings (loss) per share — diluted
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	1.95	1.25	0.29
Income (loss) from discontinued operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.03	0.21	(1.85)
Net income (loss) attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	$ 1.98	$ 1.46	$ (1.56)