Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	May 29, 2016	May 31, 2015	May 25, 2014
Income Statement [Abstract]
Net sales	$ 11,642.9	$ 11,937.0	$ 11,838.2
Costs and expenses:
Cost of goods sold	8,552.1	9,061.4	8,910.8
Selling, general and administrative expenses	2,209.4	1,545.3	1,778.9
Interest expense, net	297.8	330.0	377.5
Income from continuing operations before income taxes and equity method investment earnings	583.6	1,000.3	771.0
Income tax expense	225.4	362.1	178.3
Equity method investment earnings	137.8	122.1	32.5
Income from continuing operations	496.0	760.3	625.2
Income (loss) from discontinued operations, net of tax	(1,161.9)	(1,001.1)	(310.1)
Net income (loss)	(665.9)	(240.8)	315.1
Less: Net income attributable to noncontrolling interests	11.1	11.8	12.0
Net income (loss) attributable to ConAgra Foods, Inc.	$ (677.0)	$ (252.6)	$ 303.1
Earnings (loss) per share — basic
Income (loss) from continuing operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	$ 1.11	$ 1.75	$ 1.45
Income from discontinued operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	(2.68)	(2.35)	(0.73)
Net income (loss) attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	(1.57)	(0.60)	0.72
Earnings (loss) per share — diluted
Income (loss) from continuing operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	1.09	1.73	1.43
Income from discontinued operations attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	(2.65)	(2.32)	(0.73)
Net income (loss) attributable to ConAgra Foods, Inc. common stockholders (in dollars per share)	$ (1.56)	$ (0.59)	$ 0.70