Document and Entity Information - shares	6 Months Ended
	Jan. 27, 2018	Mar. 05, 2018
Document and Entity Information
Entity Registrant Name	UNITED NATURAL FOODS INC
Entity Central Index Key	0001020859
Current Fiscal Year End Date	--07-28
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jan. 27, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		50,409,083