SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregated Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020
Revenue from External Customer [Line Items]
Sales	$ 2,030,330	$ 1,804,594
Percentage of total sales	100.00%	100.00%
Center Store
Revenue from External Customer [Line Items]
Sales	$ 1,218,550	$ 1,111,751
Percentage of total sales	60.60%	61.60%
Fresh
Revenue from External Customer [Line Items]
Sales	$ 736,657	$ 616,271
Percentage of total sales	35.70%	34.20%
Pharmacy
Revenue from External Customer [Line Items]
Sales	$ 67,048	$ 68,508
Percentage of total sales	3.30%	3.80%
Other Product
Revenue from External Customer [Line Items]
Sales	$ 8,075	$ 8,064
Percentage of total sales	0.40%	0.40%