Condensed Consolidated Statements of Earnings (unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 26, 2012	Feb. 27, 2011	Feb. 26, 2012	Feb. 27, 2011
Condensed Consolidated Statements of Earnings [Abstract]
Net sales	$ 3,373.1	$ 3,141.3	$ 9,849.0	$ 9,093.1
Costs and expenses:
Cost of goods sold	2,583.1	2,344.0	7,703.0	6,884.5
Selling, general and administrative expenses	373.7	404.1	1,252.4	1,242.4
Interest expense, net	49.7	51.6	153.2	122.6
Income from continuing operations before income taxes and equity method investment earnings	366.6	341.6	740.4	843.6
Income tax expense	107.0	122.5	238.3	290.8
Equity method investment earnings	12.6	6.6	30.3	17.4
Income from continuing operations	272.2	225.7	532.4	570.2
Income (loss) from discontinued operations, net of tax		(10.6)	0.1	(7.0)
Net income	272.2	215.1	532.5	563.2
Less: Net income attributable to noncontrolling interests	0.6	0.3	3.8	1.1
Net income attributable to ConAgra Foods, Inc.	$ 271.6	$ 214.8	$ 528.7	$ 562.1
Earnings per share - basic
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 0.66	$ 0.53	$ 1.28	$ 1.30
Loss from discontinued operations attributable to ConAgra Foods, Inc. common stockholders		$ (0.03)		$ (0.01)
Net income attributable to ConAgra Foods, Inc. common stockholders	$ 0.66	$ 0.50	$ 1.28	$ 1.29
Earnings per share - diluted
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 0.65	$ 0.52	$ 1.26	$ 1.29
Loss from discontinued operations attributable to ConAgra Foods, Inc. common stockholders		$ (0.02)		$ (0.02)
Net income attributable to ConAgra Foods, Inc. common stockholders	$ 0.65	$ 0.50	$ 1.26	$ 1.27
Cash dividends declared per common share	$ 0.24	$ 0.23	$ 0.71	$ 0.66