Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016
Income Statement [Abstract]
Net sales	$ 1,981.2	$ 2,199.3	$ 5,965.2	$ 6,611.1
Costs and expenses:
Cost of goods sold	1,360.2	1,579.5	4,152.1	4,762.0
Selling, general and administrative expenses	349.7	447.0	999.3	1,293.0
Interest expense, net	45.7	76.4	158.0	235.7
Income from continuing operations before income taxes and equity method investment earnings	225.6	96.4	655.8	320.4
Income tax expense	67.9	33.6	315.5	126.0
Equity method investment earnings	21.8	8.6	52.1	50.7
Income from continuing operations	179.5	71.4	392.4	245.1
Income (loss) from discontinued operations, net of tax	0.7	134.9	103.7	(1,031.9)
Net income (loss)	180.2	206.3	496.1	(786.8)
Less: Net income attributable to noncontrolling interests	0.5	1.7	8.1	7.8
Net income (loss) attributable to Conagra Brands, Inc.	$ 179.7	$ 204.6	$ 488.0	$ (794.6)
Earnings (loss) per share — basic
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	$ 0.41	$ 0.16	$ 0.90	$ 0.56
Income (loss) from discontinued operations, net of tax (in dollars per share)	0.01	0.30	0.22	(2.40)
Net income (loss) attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.42	0.46	1.12	(1.84)
Earnings (loss) per share — diluted
Income from continuing operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.41	0.16	0.89	0.56
Income (loss) from discontinued operations attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.00	0.30	0.22	(2.39)
Net income (loss) attributable to Conagra Brands, Inc. common stockholders (in dollars per share)	0.41	0.46	1.11	(1.83)
Cash dividends declared per common share (in dollars per share)	$ 0.20	$ 0.25	$ 0.70	$ 0.75