Condensed Consolidated Statements of Earnings - USD ($) $ in Millions	3 Months Ended
	Aug. 27, 2017	Aug. 28, 2016
Income Statement [Abstract]
Net sales	$ 1,804.2	$ 1,895.6
Costs and expenses:
Cost of goods sold	1,285.2	1,351.0
Selling, general and administrative expenses	239.0	231.7
Interest expense, net	36.4	58.2
Income from continuing operations before income taxes and equity method investment earnings	243.6	254.7
Income tax expense	120.0	169.2
Equity method investment earnings	30.0	13.1
Income from continuing operations	153.6	98.6
Income (loss) from discontinued operations, net of tax	(0.3)	91.4
Net income	153.3	190.0
Less: Net income attributable to noncontrolling interests	0.8	3.8
Net income attributable to Conagra Brands, Inc.	$ 152.5	$ 186.2
Earnings per share — basic
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	$ 0.37	$ 0.22
Income from discontinued operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.00	0.20
Net income attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.37	0.42
Earnings per share — diluted
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.36	0.22
Income from discontinued operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.00	0.20
Net income attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.36	0.42
Cash dividends declared per common share (in dollars per share)	$ 0.2125	$ 0.25