Document and Entity Information	9 Months Ended
	Feb. 24, 2019 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	Feb. 24, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding	485,914,676
Entity Emerging Growth Company	false
Entity Small Business	false