EARNINGS (LOSS) PER SHARE (Average Share Amounts to Compute EPS) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Aug. 30, 2015	Aug. 24, 2014
Net income (loss) available to ConAgra Foods, Inc. common stockholders:
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders	$ 165.5	$ 94.0
Income (loss) from discontinued operations, net of tax, attributable to ConAgra Foods, Inc. common stockholders	(1,319.6)	388.3
Net income (loss) attributable to ConAgra Foods, Inc.	(1,154.1)	482.3
Less: Increase in redemption value of noncontrolling interests in excess of earnings allocated	0.4	0.4
Net income (loss) available to ConAgra Foods, Inc. common stockholders	$ (1,154.5)	$ 481.9
Weighted average shares outstanding:
Basic weighted average shares outstanding (in shares)	430.7	423.9
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities (in shares)	5.0	5.4
Diluted weighted average shares outstanding (in shares)	435.7	429.3