Document and Entity Information - USD ($)	12 Months Ended
	Aug. 01, 2015	Sep. 11, 2015	Jan. 30, 2015
Document and Entity Information
Entity Registrant Name	UNITED NATURAL FOODS INC
Entity Central Index Key	0001020859
Current Fiscal Year End Date	--08-01
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Aug. 01, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		50,100,946
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 3,869,497,158