Document and Entity Information	9 Months Ended
	Feb. 25, 2018 shares
Document and Entity Information [Abstract]
Entity Registrant Name	CONAGRA BRANDS INC.
Entity Central Index Key	0000023217
Current Fiscal Year End Date	--05-27
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Feb. 25, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding	393,519,611