Document and Entity Information	3 Months Ended
	Aug. 27, 2017 shares
Document and Entity Information [Abstract]
Entity Registrant Name	CONAGRA BRANDS INC.
Entity Central Index Key	0000023217
Current Fiscal Year End Date	--05-28
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Aug. 27, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding	408,498,132