EARNINGS PER SHARE (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended							6 Months Ended	12 Months Ended
	May 29, 2016	Feb. 28, 2016	Nov. 29, 2015	Aug. 30, 2015	May 31, 2015	Feb. 22, 2015	Aug. 24, 2014	Nov. 23, 2014	May 29, 2016	May 31, 2015	May 25, 2014
Net income available to ConAgra Foods, Inc. common stockholders:
Income from continuing operations attributable to ConAgra Foods, Inc. common stockholders									$ 484.9	$ 748.5	$ 613.2
Loss from discontinued operations, net of tax, attributable to ConAgra Foods, Inc. common stockholders	$ 146.0	$ 18.7	$ (6.8)	$ (1,319.8)	$ (23.0)	$ (1,165.0)	$ 389.1	$ (202.2)	(1,161.9)	(1,001.1)	(310.1)
Net income (loss) attributable to ConAgra Foods, Inc.	$ 117.6	$ 204.6	$ 154.9	$ (1,154.1)	$ 209.2	$ (954.1)	$ 482.3	$ 10.0	(677.0)	(252.6)	303.1
Less: Increase in redemption value of noncontrolling interests in excess of earnings allocated									4.8	1.7	1.7
Net income (loss) available to ConAgra Foods, Inc. common stockholders									$ (681.8)	$ (254.3)	$ 301.4
Weighted average shares outstanding: (in shares)
Basic weighted average shares outstanding (in shares)									434.4	426.1	421.3
Add: Dilutive effect of stock options, restricted stock unit awards, and other dilutive securities (in shares)									4.1	5.2	6.2
Diluted weighted average shares outstanding (in shares)									438.5	431.3	427.5