DISCONTINUED OPERATIONS - Income Statements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 27, 2019	[1]	Apr. 28, 2018
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 640,121		$ 1,413,756
Cost of sales	463,157		1,031,330
Gross profit	176,964		382,426
Operating expenses	145,191		321,777
Operating income	31,773		60,649
Interest expense	284		738
Net periodic benefit income, excluding service cost	(146)		(304)
Equity in earnings of unconsolidated subsidiaries	(507)		(1,391)
Income from discontinued operations before income taxes	32,142		61,606
Income tax provision	7,772	$ 0	13,759		$ 0
Income from discontinued operations, net of tax attributable to United Natural Foods, Inc.	$ 24,370	$ 0	$ 47,847		$ 0

[1] These results reflect retail operations from the Supervalu acquisition date of October 22, 2018 to April 27, 2019.