Document and Entity Information	3 Months Ended
	Aug. 26, 2018 shares
Document and Entity Information [Abstract]
Entity Registrant Name	CONAGRA BRANDS INC.
Entity Central Index Key	0000023217
Current Fiscal Year End Date	--05-26
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Aug. 26, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding	391,739,943
Entity Emerging Growth Company	false
Entity Small Business	false