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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands | 12 Months Ended
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Jul. 29, 2017 USD ($) store segment | Jul. 30, 2016 USD ($) | Jul. 25, 2015 USD ($)
Accounting Policies [Abstract] |  |  |
Number of stores | store | 29 |  |
Fiscal period duration | 371 days | 364 days | 364 days
Number of operating segments | segment | 1 |  |
Cash and Cash Equivalents [Abstract] |  |  |
Credit and debit card receivables | $ 7,641 | $ 7,534 |
Inventory Disclosure [Abstract] |  |  |
Percentage of LIFO inventory | 65.00% |  |
LIFO reserve inventory | $ 14,410 | 14,522 |
Marketing and Advertising Expense [Abstract] |  |  |
Advertising expense | $ 11,824 | 11,644 | $ 11,121
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 | $ 60,037 | $ 63,609 |

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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 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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