Earnings Per Share (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 26, 2012	Feb. 27, 2011	Feb. 26, 2012	Feb. 27, 2011
Net income available to ConAgra Foods, Inc. common stockholders:
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 271.6	$ 225.4	$ 528.6	$ 569.1
Income (loss) from discontinued operations, net of tax, attributable to ConAgra Foods, Inc. common stockholders		(10.6)	0.1	(7.0)
Net income attributable to ConAgra Foods, Inc.	271.6	214.8	528.7	562.1
Less: Increase (decrease) in redemption value of noncontrolling interests in excess of earnings allocated	0.1	(0.8)	1.1	1.5
Net income available to ConAgra Foods, Inc. common stockholders	$ 271.5	$ 215.6	$ 527.6	$ 560.6
Weighted average shares outstanding:
Basic weighted average shares outstanding	414.3	428.4	413.6	435.5
Add: Dilutive effect of stock options, restricted stock awards, and other dilutive securities	5.7	4.4	5.5	4.2
Diluted weighted average shares outstanding	420.0	432.8	419.1	439.7