SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregated Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 25, 2020	Jul. 27, 2019
Revenue from External Customer [Line Items]
Sales	$ 1,804,594	$ 1,643,502
Percentage of total sales	100.00%	100.00%
Center Store
Revenue from External Customer [Line Items]
Sales	$ 1,111,751	$ 1,011,232
Percentage of total sales	61.60%	61.50%
Fresh
Revenue from External Customer [Line Items]
Sales	$ 616,271	$ 558,245
Percentage of total sales	34.20%	34.00%
Pharmacy
Revenue from External Customer [Line Items]
Sales	$ 68,508	$ 69,404
Percentage of total sales	3.80%	4.20%
Other Product
Revenue from External Customer [Line Items]
Sales	$ 8,064	$ 4,621
Percentage of total sales	0.40%	0.30%