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STOCKHOLDERS' EQUITY (Reconciliation of Stockholders Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended				6 Months Ended
	Nov. 24, 2013	Nov. 25, 2012	Nov. 24, 2013	Nov. 25, 2012	Nov. 24, 2013 Common Stock	May 26, 2013 Common Stock	Nov. 24, 2013 Additional Paid-in Capital	Nov. 24, 2013 Retained Earnings	Nov. 24, 2013 Accumulated Other Comprehensive Income (Loss)	Nov. 24, 2013 Treasury Stock	Nov. 24, 2013 Noncontrolling Interests
Schedule Of Stockholders Equity [Line Items]
Opening Balance			$ 5,363.0		$ 2,839.7	$ 2,839.7	$ 1,006.2	$ 5,129.5	$ (196.1)	$ (3,514.9)	$ 98.6
Opening Balance, Shares					567.9	567.9
Stock option and incentive plans			96.3				12.1	(0.5)		84.7
Currency translation adjustment			(21.0)						(11.1)		(9.9)
Issuance of treasury shares			0
Repurchase of common shares			(100.0)							(100.0)
Unrealized gain on securities			0.4						0.4
Derivative adjustment, net of reclassification adjustment	(6.2)	(0.3)	39.4	(3.0)					39.4
Activities of noncontrolling interests			0				(0.8)				0.8
Pension and postretirement healthcare benefits	1.4	0.2	1.2	1.1					1.2
Dividends declared on common stock; $0.50 per share			(210.6)					(210.6)
Net income attributable to ConAgra Foods, Inc.	248.7	211.6	393.0	461.7				393.0
Ending Balance	$ 5,561.7		$ 5,561.7		$ 2,839.7	$ 2,839.7	$ 1,017.5	$ 5,311.4	$ (166.2)	$ (3,530.2)	$ 89.5
Ending Balance, Shares					567.9	567.9