Consolidated Statements of Common Stockholders' Equity (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Noncontrolling Interest
Opening Balance at May. 25, 2008	$ 5,337.4	$ 2,833.4	$ 866.9	$ 3,409.5	$ 286.5	$ (2,058.9)	$ 0
Opening Balance, shares at May. 25, 2008		566.7
Stock option and incentive plans	40.1	2.5	17.5	(0.6)		20.7
Stock option and incentive plans, shares		0.5
Currency translation adjustment, net of reclassification adjustment	(70.1)				(70.1)
Repurchase of common shares	900.0					900.0
Unrealized loss on securities	(0.1)				(0.1)
Derivative adjustment, net of reclassification adjustment	(0.7)				(0.7)
Adoption of new deferred compensation accounting guidance	(3.9)			(3.9)
Pension and postretirement healthcare benefits	(319.3)				(319.3)
Dividends declared on common stock; $0.76, $0.79 & $0.89 per share	(340.9)			(340.9)
Net income attributable to ConAgra Foods, Inc.	978.4			978.4
Ending Balance at May. 31, 2009	4,720.9	2,835.9	884.4	4,042.5	(103.7)	(2,938.2)	0
Ending Balance, Shares at May. 31, 2009		567.2
Stock option and incentive plans	110.7	3.8	15.1	(1.3)		93.1
Stock option and incentive plans, shares		0.7
Currency translation adjustment, net of reclassification adjustment	(3.7)				(3.7)
Repurchase of common shares	(100.0)					(100.0)
Derivative adjustment, net of reclassification adjustment	0.2				0.2
Activities of noncontrolling interests	3.0		(2.0)				5.0
Pension and postretirement healthcare benefits	(178.1)				(178.1)
Dividends declared on common stock; $0.76, $0.79 & $0.89 per share	(349.9)			(349.9)
Net income attributable to ConAgra Foods, Inc.	725.8			725.8
Ending Balance at May. 30, 2010	4,928.9	2,839.7	897.5	4,417.1	(285.3)	(2,945.1)	5.0
Ending Balance, Shares at May. 30, 2010		567.9
Stock option and incentive plans	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	24.2				24.2
Dividends declared on common stock; $0.76, $0.79 & $0.89 per share	(380.1)			(380.1)
Net income attributable to ConAgra Foods, Inc.	817.0			817.0
Ending Balance at May. 29, 2011	$ 4,708.5	$ 2,839.7	$ 899.1	$ 4,853.6	$ (222.7)	$ (3,668.2)	$ 7.0
Ending Balance, Shares at May. 29, 2011		567.9