EARNINGS PER SHARE (Average Share Amounts to Compute EPS) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 24, 2014	Aug. 25, 2013
Net income available to ConAgra Foods, Inc. common stockholders:
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 109.0	$ 130.5
Income from discontinued operations, net of tax, attributable to ConAgra Foods, Inc. common stockholders	373.3	13.8
Net income attributable to ConAgra Foods, Inc.	482.3	144.3
Less: Increase in redemption value of noncontrolling interests in excess of earnings allocated	0.4	0.4
Net income available to ConAgra Foods, Inc. common stockholders	$ 481.9	$ 143.9
Weighted average shares outstanding:
Basic weighted average shares outstanding	423.9	421.1
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities	5.4	7.1
Diluted weighted average shares outstanding	429.3	428.2