Earnings Per Share (Details) (USD $) In Millions	3 Months Ended
	Aug. 28, 2011	Aug. 29, 2010
Net income available to ConAgra Foods, Inc. common stockholders:
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 85.2	$ 143.4
Income from discontinued operations, net of tax, attributable to ConAgra Foods, Inc. common stockholders	0.1	3.0
Net income attributable to ConAgra Foods, Inc. common stockholders	85.3	146.4
Less: Increase in redemption value of noncontrolling interests in excess of earnings allocated	0.3	1.4
Net income available to ConAgra Foods, Inc. common stockholders	$ 85.0	$ 145.0
Weighted Average Shares Outstanding:
Basic weighted average shares outstanding	412.7	441.5
Add: Dilutive effect of stock options, restricted stock awards, and other dilutive securities	5.4	4.5
Diluted weighted average shares outstanding	418.1	446.0