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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jul. 27, 2019 USD ($) store segment | Jul. 28, 2018 USD ($) | Jun. 24, 2019 store
Accounting Policies [Abstract] |  |  |
Number of operating segments | segment | 1 |  |
Business Acquisition [Line Items] |  |  |
Number of stores | store | 30 |  |
Cash and Cash Equivalents [Abstract] |  |  |
Credit and debit card receivables | $ 8,061 | $ 8,227 |
Inventory Disclosure [Abstract] |  |  |
Percentage of LIFO inventory | 64.00% |  |
LIFO reserve inventory | $ 14,512 | 14,234 |
Leases [Abstract] |  |  |
Deferred rent obligation | 13,102 | 13,259 |
Marketing and Advertising Expense [Abstract] |  |  |
Advertising expense | 11,705 | 11,514 |
Gourmet Garage Specialty Markets |  |  |
Business Acquisition [Line Items] |  |  |
Number of stores | store |  |  | 3
Wakefern |  |  |
Related Party Transaction [Line Items] |  |  |
Demand deposits invested at related party Wakefern | $ 73,879 | 63,413 |
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 |  |
Operating Expense |  |  |
Business Acquisition [Line Items] |  |  |
Prior period reclassification adjustment |  | 4,027 |
Cost of Sales |  |  |
Business Acquisition [Line Items] |  |  |
Prior period reclassification adjustment |  | $ 997 |

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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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