QUARTERLY FINANCIAL DATA (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	May 26, 2013		Feb. 24, 2013		Nov. 25, 2012		Aug. 26, 2012		May 27, 2012		Feb. 26, 2012		Nov. 27, 2011		Aug. 28, 2011		May 26, 2013	May 27, 2012	May 29, 2011
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 4,593.5		$ 3,850.5		$ 3,735.5		$ 3,311.9		$ 3,434.9		$ 3,396.0		$ 3,431.7		$ 3,105.3		$ 15,491.4	$ 13,367.9	$ 12,386.1
Gross profit	951.8		874.0		862.9		871.3		676.2		786.6		754.0		596.0
Income (loss) from discontinued operations	0		0		0		0		0		0		0		0.1		0	0.1	(11.5)
Net income attributable to ConAgra Foods, Inc.	$ 192.2		$ 120.0		$ 211.6		$ 250.1		$ (86.2)		$ 280.1		$ 180.2		$ 93.8		$ 773.9	$ 467.9	$ 817.6
Basic earnings per share:
Net income attributable to ConAgra Foods, Inc. common stockholders (Dollars Per Share)	$ 0.46	[1]	$ 0.29	[1]	$ 0.52	[1]	$ 0.61	[1]	$ (0.21)	[1]	$ 0.68	[1]	$ 0.43	[1]	$ 0.23	[1]	$ 1.88	$ 1.13	$ 1.90
Diluted earnings per share:
Net income attributable to ConAgra Foods, Inc. common stockholders (Dollars Per Share)	$ 0.45	[1]	$ 0.29	[1]	$ 0.51	[1]	$ 0.61	[1]	$ (0.21)	[1]	$ 0.67	[1]	$ 0.43	[1]	$ 0.22	[1]	$ 1.85	$ 1.12	$ 1.88
Dividends declared per common share	$ 0.25	[1]	$ 0.25	[1]	$ 0.25	[1]	$ 0.24	[1]	$ 0.24	[1]	$ 0.24	[1]	$ 0.24	[1]	$ 0.23	[1]	$ 0.99	$ 0.95	$ 0.89
Share price:
High	$ 36.16		$ 33.92		$ 28.76		$ 25.93		$ 26.75		$ 27.18		$ 25.95		$ 26.53
Low	$ 33.52		$ 28.29		$ 24.99		$ 23.81		$ 25.11		$ 24.31		$ 22.99		$ 22.72

[1] Basic and diluted earnings per share are calculated independently for each of the quarters presented. Accordingly, the sum of the quarterly earnings per share amounts may not agree with the total year.