Document and Entity Information (USD $)	12 Months Ended
	May 25, 2014	Jun. 22, 2014	Nov. 24, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	CONAGRA FOODS INC /DE/
Entity Central Index Key	0000023217
Current Fiscal Year End Date	--05-25
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	May 25, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	CAG
Amendment Flag	false
Entity Common Stock, Shares Outstanding		422,498,461
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 13,738,886,936