Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 27, 2016	Nov. 29, 2015	Nov. 27, 2016	Nov. 29, 2015
Income Statement [Abstract]
Net sales	$ 2,088.4	$ 2,358.8	$ 3,984.0	$ 4,411.8
Costs and expenses:
Cost of goods sold	1,440.9	1,690.8	2,791.9	3,182.5
Selling, general and administrative expenses	417.9	483.2	649.6	846.0
Interest expense, net	54.1	79.2	112.3	159.3
Income from continuing operations before income taxes and equity method investment earnings	175.5	105.6	430.2	224.0
Income tax expense	78.4	43.1	247.6	92.4
Equity method investment earnings	17.2	17.6	30.3	42.1
Income from continuing operations	114.3	80.1	212.9	173.7
Income (loss) from discontinued operations, net of tax	11.6	79.2	103.0	(1,166.8)
Net income (loss)	125.9	159.3	315.9	(993.1)
Less: Net income attributable to noncontrolling interests	3.8	4.4	7.6	6.1
Net income (loss) attributable to Conagra Brands, Inc.	$ 122.1	$ 154.9	$ 308.3	$ (999.2)
Earnings (loss) per share — basic
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	$ 0.26	$ 0.18	$ 0.48	$ 0.40
Income (loss) from discontinued operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.02	0.18	0.22	(2.71)
Net income (loss) attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.28	0.36	0.70	(2.31)
Earnings (loss) per share — diluted
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.26	0.18	0.48	0.40
Net income (loss) attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.02	0.17	0.22	(2.69)
Net income (loss) attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.28	0.35	0.70	(2.29)
Cash dividends declared per common share (in dollars per share)	$ 0.25	$ 0.25	$ 0.50	$ 0.50