Document and Entity Information	9 Months Ended
	Feb. 28, 2016 shares
Document and Entity Information [Abstract]
Entity Registrant Name	CONAGRA FOODS INC /DE/
Entity Central Index Key	0000023217
Current Fiscal Year End Date	--05-29
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Feb. 28, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding	436,414,916