Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended
	Aug. 28, 2016	Aug. 30, 2015
Income Statement [Abstract]
Net sales	$ 2,667.5	$ 2,794.9
Costs and expenses:
Cost of goods sold	1,943.4	2,093.8
Selling, general and administrative expenses	281.5	405.4
Interest expense, net	59.0	80.3
Income from continuing operations before income taxes and equity method investment earnings	383.6	215.4
Income tax expense	218.7	85.0
Equity method investment earnings	23.6	37.0
Income from continuing operations	188.5	167.4
Income (loss) from discontinued operations, net of tax	1.5	(1,319.8)
Net income (loss)	190.0	(1,152.4)
Less: Net income attributable to noncontrolling interests	3.8	1.7
Net income (loss) attributable to ConAgra Foods, Inc.	$ 186.2	$ (1,154.1)
Earnings (loss) per share — basic
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	$ 0.42	$ 0.38
Loss from discontinued operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	0.00	(3.06)
Net income (loss) attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	0.42	(2.68)
Earnings (loss) per share — diluted
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	0.42	0.38
Loss from discontinued operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	0.00	(3.03)
Net income (loss) attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	0.42	(2.65)
Cash dividends declared per common share (in dollars per share)	$ 0.25	$ 0.25