Document and Entity Information	3 Months Ended
	Jan. 26, 2013	Feb. 26, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	UNITED NATURAL FOODS INC
Entity Central Index Key	0001020859
Current Fiscal Year End Date	--08-03
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jan. 26, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		49,298,389