Document and Entity Information Document - shares	3 Months Ended
	Nov. 02, 2019	Dec. 06, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Nov. 02, 2019
Document Transition Report	false
Entity File Number	001-15723
Entity Registrant Name	UNITED NATURAL FOODS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	05-0376157
Entity Address, Address Line One	313 Iron Horse Way,
Entity Address, City or Town	Providence,
Entity Address, State or Province	RI
Entity Address, Postal Zip Code	02908
City Area Code	401
Local Phone Number	528-8634
Title of 12(b) Security	Common stock, par value $0.01
Trading Symbol	UNFI
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		53,508,147
Entity Central Index Key	0001020859
Current Fiscal Year End Date	--08-01
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false