Consolidated Statements of Common Stockholders' Equity Statement (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interests
Opening Balance, Value at May. 30, 2010	$ 4,897.1	$ 2,839.7	$ 897.5	$ 4,253.2	$ (153.2)	$ (2,945.1)	$ 5.0
Opening Balance, Shares at May. 30, 2010		567.9
Stock options and incentive plans, shares
Stock option and incentive plans, value	105.0		3.5	(0.4)		101.9
Currency translation adjustment, net of reclassification adjustment	45.7				45.7
Repurchase of common shares	(825.0)					(825.0)
Unrealized loss on securities	(0.1)				(0.1)
Derivative adjustment, net of reclassification adjustment	(7.2)				(7.2)
Activities of noncontrolling interests	0.1		(1.9)				2.0
Pension and postretirement healthcare benefits	23.6				23.6
Dividends declared on common stock	(380.1)			(380.1)
Net income attributable to ConAgra Foods, Inc.	817.6			817.6
Ending Balance, Value at May. 29, 2011	4,676.7	2,839.7	899.1	4,690.3	(91.2)	(3,668.2)	7.0
Ending Balance, Shares at May. 29, 2011		567.9
Stock option and incentive plans, value	255.5		3.9	(1.3)		252.9
Currency translation adjustment, net of reclassification adjustment	(56.4)				(52.0)		(4.4)
Repurchase of common shares	(352.4)					(352.4)
Unrealized loss on securities	(0.1)				(0.1)
Derivative adjustment, net of reclassification adjustment	(89.1)				(89.1)
Acquisition of majority interest in ATFL	92.6						92.6
Activities of noncontrolling interests	(0.2)		(1.5)				1.3
Pension and postretirement healthcare benefits	(66.7)				(66.7)
Dividends declared on common stock	(391.8)			(391.8)
Net income attributable to ConAgra Foods, Inc.	467.9			467.9
Ending Balance, Value at May. 27, 2012	4,536.0	2,839.7	901.5	4,765.1	(299.1)	(3,767.7)	96.5
Ending Balance, Shares at May. 27, 2012		567.9
Stock option and incentive plans, value	332.7		56.2	(2.2)		278.7
Currency translation adjustment, net of reclassification adjustment	2.1				2.8		(0.7)
Repurchase of common shares	(245.0)					(245.0)
Issuance of treasury shares	269.2		50.1			219.1
Unrealized loss on securities	0.2				0.2
Derivative adjustment, net of reclassification adjustment	32.8				32.8
Activities of noncontrolling interests	1.2		(1.6)				2.8
Pension and postretirement healthcare benefits	67.2				67.2
Dividends declared on common stock	(407.3)			(407.3)
Net income attributable to ConAgra Foods, Inc.	773.9			773.9
Ending Balance, Value at May. 26, 2013	$ 5,363.0	$ 2,839.7	$ 1,006.2	$ 5,129.5	$ (196.1)	$ (3,514.9)	$ 98.6
Ending Balance, Shares at May. 26, 2013		567.9