STOCKHOLDERS' EQUITY (Reconciliation of Stockholders Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended				9 Months Ended
	Feb. 23, 2014	Feb. 24, 2013	Feb. 23, 2014	Feb. 24, 2013	Feb. 23, 2014 Common Stock	May 26, 2013 Common Stock	Feb. 23, 2014 Additional Paid-in Capital	Feb. 23, 2014 Retained Earnings	Feb. 23, 2014 Accumulated Other Comprehensive Income (Loss)	Feb. 23, 2014 Treasury Stock	Feb. 23, 2014 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			125.7				23.6	(0.4)		102.5
Currency translation adjustment			(50.5)						(41.3)		(9.2)
Issuance of treasury shares			0
Repurchase of common shares			(100.0)							(100.0)
Unrealized gain on securities			0.2						0.2
Derivative adjustment, net of reclassification adjustment			65.7						65.7
Activities of noncontrolling interests			0.6				(1.2)				1.8
Pension and postretirement healthcare benefits			1.8						1.8
Dividends declared on common stock; $0.75 per share			(316.0)					(316.0)
Net income attributable to ConAgra Foods, Inc.	234.3	120.0	627.3	581.7				627.3
Ending Balance	$ 5,717.8		$ 5,717.8		$ 2,839.7	$ 2,839.7	$ 1,028.6	$ 5,440.4	$ (169.7)	$ (3,512.4)	$ 91.2
Ending Balance, Shares					567.9	567.9