Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2016	Feb. 22, 2015	Feb. 28, 2016	Feb. 22, 2015
Income Statement [Abstract]
Net sales	$ 2,924.1	$ 2,907.3	$ 8,815.4	$ 8,811.5
Costs and expenses:
Cost of goods sold	2,123.7	2,187.3	6,485.5	6,742.5
Selling, general and administrative expenses	489.6	360.3	1,419.7	1,146.1
Interest expense, net	76.9	79.8	236.8	241.8
Income from continuing operations before income taxes and equity method investment earnings	233.9	279.9	673.4	681.1
Income tax expense	91.0	100.6	259.3	247.9
Equity method investment earnings	44.7	33.0	107.0	92.6
Income from continuing operations	187.6	212.3	521.1	525.8
Income (loss) from discontinued operations, net of tax	18.7	(1,165.0)	(1,307.9)	(978.1)
Net income (loss)	206.3	(952.7)	(786.8)	(452.3)
Less: Net income attributable to noncontrolling interests	1.7	1.4	7.8	9.5
Net income (loss) attributable to ConAgra Foods, Inc.	$ 204.6	$ (954.1)	$ (794.6)	$ (461.8)
Earnings (loss) per share — basic
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	$ 0.42	$ 0.49	$ 1.17	$ 1.21
Income (loss) from discontinued operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	0.04	(2.72)	(3.01)	(2.30)
Net income (loss) attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	0.46	(2.23)	(1.84)	(1.09)
Earnings (loss) per share — diluted
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	0.41	0.49	1.16	1.20
Income (loss) from discontinued operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	0.05	(2.70)	(2.99)	(2.27)
Net income (loss) attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	0.46	(2.21)	(1.83)	(1.07)
Cash dividends declared per common share (in dollars per share)	$ 0.25	$ 0.25	$ 0.75	$ 0.75