CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jan. 29, 2022	Jan. 30, 2021	Jan. 29, 2022	Jan. 30, 2021
Income Statement [Abstract]
Net sales	$ 7,416	$ 6,900	$ 14,413	$ 13,584
Cost of sales	6,341	5,905	12,296	11,619
Gross profit	1,075	995	2,117	1,965
Operating expenses	944	870	1,876	1,774
Restructuring, acquisition and integration related expenses	5	18	8	34
Loss on sale of assets	1	0	1	0
Operating income	125	107	232	157
Net periodic benefit income, excluding service cost	(10)	(17)	(20)	(34)
Interest expense, net	44	51	84	120
Other, net	(2)	(2)	(1)	(3)
Income from continuing operations before income taxes	93	75	169	74
Provision for income taxes	25	17	24	16
Net income from continuing operations	68	58	145	58
Income from discontinued operations, net of tax	0	3	0	3
Net income including noncontrolling interests	68	61	145	61
Less net income attributable to noncontrolling interests	(2)	(2)	(3)	(3)
Net income attributable to United Natural Foods, Inc.	$ 66	$ 59	$ 142	$ 58
Basic earnings per share:
Continuing operations (in dollars per share)	$ 1.13	$ 1.01	$ 2.47	$ 0.99
Discontinued operations (in dollars per share)	0	0.04	0	0.05
Basic earnings per share (in dollars per share)	1.13	1.05	2.47	1.04
Diluted earnings per share:
Continuing operations (in dollars per share)	1.08	0.96	2.33	0.93
Discontinued operations (in dollars per share)	0	0.04	0	0.05
Diluted earnings per share (in dollars per share)	$ 1.08	$ 1.00	$ 2.33	$ 0.98
Weighted average shares outstanding:
Basic (in shares)	58.3	56.1	57.6	55.7
Diluted (in shares)	61.0	59.2	61.0	59.1