EARNINGS PER SHARE (Average Share Amounts to Compute EPS) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	May 26, 2013	Feb. 24, 2013	Nov. 25, 2012	Aug. 26, 2012	May 27, 2012	Feb. 26, 2012	Nov. 27, 2011	Aug. 28, 2011	May 26, 2013	May 27, 2012	May 29, 2011
Net income available to ConAgra Foods, Inc. common stockholders:
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders									$ 773.9	$ 467.8	$ 829.1
Income (loss) from discontinued operations, net of tax, attributable to ConAgra Foods, Inc. common stockholders	0	0	0	0	0	0	0	0.1	0	0.1	(11.5)
Net income attributable to ConAgra Foods, Inc.	192.2	120.0	211.6	250.1	(86.2)	280.1	180.2	93.8	773.9	467.9	817.6
Less: Increase in redemption value of noncontrolling interests in excess of earnings allocated									1.6	1.5	1.9
Net income available to ConAgra Foods, Inc. common stockholders									$ 772.3	$ 466.4	$ 815.7
Weighted average shares outstanding:
Basic weighted average shares outstanding									410.8	412.9	429.7
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities									6.8	5.4	4.6
Diluted weighted average shares outstanding									417.6	418.3	434.3