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Earnings Per Share (Details) (USD $) In Millions	3 Months Ended								12 Months Ended
Earnings Per Share (Details) (USD $) In Millions	May 29, 2011	Feb. 27, 2011	Nov. 28, 2010	Aug. 29, 2010	May 30, 2010	Feb. 27, 2010	Nov. 29, 2009	Aug. 30, 2009	May 29, 2011	May 30, 2010	May 31, 2009
Net income available to ConAgra Foods, Inc. common stockholders:
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders									$ 828.5	$ 745.1	$ 614.6
Income (loss) from discontinued operations, net of tax	(4.5)	(10.6)	0.6	3.0	(32.3)	7.8	1.9	3.3	(11.5)	(19.3)	363.8
Net income attributable to ConAgra Foods, Inc. common stockholders	254.9	214.8	200.9	146.4	90.6	229.6	239.7	165.9	817.0	725.8	978.4
Less: Increase in redemption value of noncontrolling interests in excess of earnings allocated									(1.9)	(1.5)
Net income available to ConAgra Foods, Inc. common stockholders									$ 815.1	$ 724.3	$ 978.4
Weighted Average Shares Outstanding:
Basic weighted average shares outstanding									429.7	443.6	452.9
Add: Dilutive effect of stock options, restricted stock awards, and other dilutive securities									4.6	3.5	2.5
Diluted weighted average shares outstanding									434.3	447.1	455.4