Condensed Consolidated Statements of Earnings (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 23, 2014	Nov. 24, 2013	Nov. 23, 2014	Nov. 24, 2013
Income Statement [Abstract]
Net sales	$ 4,150.0	$ 4,221.1	$ 7,851.0	$ 7,936.9
Costs and expenses:
Cost of goods sold	3,261.5	3,261.3	6,258.7	6,185.0
Selling, general and administrative expenses	732.6	553.1	1,224.6	1,091.2
Interest expense, net	79.3	95.5	163.0	191.3
Income from continuing operations before income taxes and equity method investment earnings	76.6	311.2	204.7	469.4
Income tax expense	84.0	106.0	126.5	134.9
Equity method investment earnings	34.0	5.2	59.6	9.3
Income from continuing operations	26.6	210.4	137.8	343.8
Income (loss) from discontinued operations, net of tax	(10.7)	42.0	362.6	55.8
Net income	15.9	252.4	500.4	399.6
Less: Net income attributable to noncontrolling interests	5.9	3.7	8.1	6.6
Net income attributable to ConAgra Foods, Inc.	$ 10.0	$ 248.7	$ 492.3	$ 393.0
Earnings per share — basic
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 0.05	$ 0.49	$ 0.30	$ 0.80
Income (loss) from discontinued operations attributable to ConAgra Foods, Inc. common stockholders	$ (0.03)	$ 0.10	$ 0.86	$ 0.13
Net income attributable to ConAgra Foods, Inc. common stockholders	$ 0.02	$ 0.59	$ 1.16	$ 0.93
Earnings per share — diluted
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 0.05	$ 0.48	$ 0.30	$ 0.79
Income (loss) from discontinued operations attributable to ConAgra Foods, Inc. common stockholders	$ (0.03)	$ 0.10	$ 0.84	$ 0.13
Net income attributable to ConAgra Foods, Inc. common stockholders	$ 0.02	$ 0.58	$ 1.14	$ 0.92
Cash dividends declared per common share	$ 0.25	$ 0.25	$ 0.50	$ 0.50