EARNINGS PER SHARE (Average Share Amounts to Compute EPS) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 24, 2013	Feb. 26, 2012	Feb. 24, 2013	Feb. 26, 2012
Net income available to ConAgra Foods, Inc. common stockholders:
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 120.0	$ 280.1	$ 581.7	$ 554.0
Income from discontinued operations, net of tax, attributable to ConAgra Foods, Inc. common stockholders	0	0	0	0.1
Net income attributable to ConAgra Foods, Inc.	120.0	280.1	581.7	554.1
Less: Increase in redemption value of noncontrolling interests in excess of earnings allocated	0.4	0.1	1.2	1.1
Net income available to ConAgra Foods, Inc. common stockholders	$ 119.6	$ 280.0	$ 580.5	$ 553.0
Weighted average shares outstanding:
Basic weighted average shares outstanding	410.7	414.3	408.4	413.6
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities	7.1	5.7	6.1	5.5
Diluted weighted average shares outstanding	417.8	420.0	414.5	419.1