CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) shares in Millions, $ in Millions	Total	Cumulative effect of change in accounting principle	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Retained Earnings Cumulative effect of change in accounting principle	Total United Natural Foods, Inc. Stockholders’ Equity	Total United Natural Foods, Inc. Stockholders’ Equity Cumulative effect of change in accounting principle	Noncontrolling Interests
Beginning balance (in shares) at Aug. 01, 2020			55.3	0.6
Beginning balance at Aug. 01, 2020	$ 1,142	$ (9)	$ 1	$ (24)	$ 569	$ (239)	$ 838	$ (9)	$ 1,145	$ (9)	$ (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock vestings (in shares)			1.5
Restricted stock vestings	(11)				(11)				(11)
Share-based compensation	23				23				23
Other comprehensive income (loss)	24					24			24
Distributions to noncontrolling interests	(1)										(1)
Net income	61						58		58		3
Ending balance (in shares) at Jan. 30, 2021			56.8	0.6
Ending balance at Jan. 30, 2021	1,229		$ 1	$ (24)	581	(215)	887		1,230		(1)
Beginning balance (in shares) at Oct. 31, 2020			56.7	0.6
Beginning balance at Oct. 31, 2020	1,148		$ 1	$ (24)	572	(227)	828		1,150		(2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock vestings (in shares)			0.1
Restricted stock vestings	(2)				(2)				(2)
Share-based compensation	11				11				11
Other comprehensive income (loss)	12					12			12
Distributions to noncontrolling interests	(1)										(1)
Net income	61						59		59		2
Ending balance (in shares) at Jan. 30, 2021			56.8	0.6
Ending balance at Jan. 30, 2021	$ 1,229		$ 1	$ (24)	581	(215)	887		1,230		(1)
Beginning balance (in shares) at Jul. 31, 2021	56.4		57.0	0.6
Beginning balance at Jul. 31, 2021	$ 1,514		$ 1	$ (24)	599	(39)	978		1,515		(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock vestings (in shares)			1.8
Restricted stock vestings	(35)				(35)				(35)
Share-based compensation	23				23				23
Other comprehensive income (loss)	30					30			30
Distributions to noncontrolling interests	(3)										(3)
Proceeds from issuance of common stock, net	9				9				9
Net income	$ 145						142		142		3
Ending balance (in shares) at Jan. 29, 2022	58.2		58.8	0.6
Ending balance at Jan. 29, 2022	$ 1,683		$ 1	$ (24)	596	(9)	1,120		1,684		(1)
Beginning balance (in shares) at Oct. 30, 2021			58.7	0.6
Beginning balance at Oct. 30, 2021	1,587		$ 1	$ (24)	582	(24)	1,054		1,589		(2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted stock vestings (in shares)			0.1
Restricted stock vestings	(2)				(2)				(2)
Share-based compensation	12				12				12
Other comprehensive income (loss)	15					15			15
Distributions to noncontrolling interests	(1)										(1)
Proceeds from issuance of common stock, net	4				4				4
Net income	$ 68						66		66		2
Ending balance (in shares) at Jan. 29, 2022	58.2		58.8	0.6
Ending balance at Jan. 29, 2022	$ 1,683		$ 1	$ (24)	$ 596	$ (9)	$ 1,120		$ 1,684		$ (1)