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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 12 Months Ended
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Jul. 28, 2018 USD ($) store segment | Jul. 29, 2017 USD ($)
Accounting Policies [Abstract] |  |
Number of stores | store | 30 |
Number of operating segments | segment | 1 |
Cash and Cash Equivalents [Abstract] |  |
Credit and debit card receivables | $ 8,227,000 | $ 7,641,000
Inventory Disclosure [Abstract] |  |
Percentage of LIFO inventory | 65.00% |
LIFO reserve inventory | $ 14,234,000 | 14,410,000
Leases [Abstract] |  |
Deferred rent obligation | 13,259 | 6,790
Marketing and Advertising Expense [Abstract] |  |
Advertising expense | 11,514,000 | 11,824,000
Wakefern |  |
Related Party Transaction [Line Items] |  |
Demand deposits invested at related party Wakefern | $ 63,413,000 | $ 60,037,000
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 |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Amount due the Entity as a result of customers utilizing point of sale debit or credit cards in exchange transactions with the entity which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. + References No definition available. + Details
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- Definition For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.26(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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