Cover - USD ($) $ in Millions	12 Months Ended
	Jul. 29, 2023	Sep. 21, 2023	Jan. 27, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jul. 29, 2023
Current Fiscal Year End Date	--07-29
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 Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2,394
Entity Common Stock, Shares Outstanding		58,499,938
Documents Incorporated by Reference	Portions of the registrant’s definitive Proxy Statement for the Annual Meeting of Stockholders to be held on December 19, 2023 are incorporated herein by reference into Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0001020859
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false