Condensed Consolidated Statements of Earnings - USD ($) $ in Millions	3 Months Ended
	Aug. 26, 2018	Aug. 27, 2017
Income Statement [Abstract]
Net sales	$ 1,834.4	$ 1,804.2
Costs and expenses:
Cost of goods sold	1,318.9	1,285.2
Selling, general and administrative expenses	257.3	259.6
Pension and postretirement non-service income	(10.2)	(20.6)
Interest expense, net	49.0	36.4
Income from continuing operations before income taxes and equity method investment earnings	219.4	243.6
Income tax expense	57.4	120.0
Equity method investment earnings	16.2	30.0
Income from continuing operations	178.2	153.6
Loss from discontinued operations, net of tax	0.0	(0.3)
Net income	178.2	153.3
Less: Net income attributable to noncontrolling interests	0.0	0.8
Net income attributable to Conagra Brands, Inc.	$ 178.2	$ 152.5
Earnings per share — basic
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	$ 0.45	$ 0.37
Income from discontinued operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.00	0.00
Net income attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.45	0.37
Earnings per share — diluted
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.45	0.36
Income from discontinued operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.00	0.00
Net income attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.45	0.36
Cash dividends declared per common share (in dollars per share)	$ 0.2125	$ 0.2125