SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands	12 Months Ended
	Jul. 30, 2016 USD ($) store segment	Jul. 25, 2015 USD ($)	Jul. 26, 2014 USD ($)
Accounting Policies [Abstract]
Number of stores | store	29
Fiscal period duration	371 days	364 days	364 days
Number of operating segments | segment	1
Recently Adopted Accounting Standards [Abstract]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 2,013
Cash and Cash Equivalents [Abstract]
Credit and debit card receivables	$ 7,534	7,633
Inventory Disclosure [Abstract]
Percentage of LIFO inventory	64.00%
LIFO reserve inventory	$ 14,522	14,693
Marketing and Advertising Expense [Abstract]
Advertising expense	$ 11,644	11,121	$ 11,474
Buildings
Property, Plant and Equipment [Line Items]
Useful life	30 years
Store fixtures and equipment
Property, Plant and Equipment [Line Items]
Useful life	10 years
Vehicles
Property, Plant and Equipment [Line Items]
Useful life	3 years
Wakefern
Related Party Transaction [Line Items]
Demand deposits invested at related party Wakefern	$ 63,609	$ 35,428