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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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Percentage of employee participants subject to a collective bargaining arrangement to all of the employer's participants in a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Period

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Number of Unions

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COMMITMENTS and CONTINGENCIES (Details) $ in Thousands	1 Months Ended	12 Months Ended	81 Months Ended
COMMITMENTS and CONTINGENCIES (Details) $ in Thousands	Nov. 30, 2018 USD ($)	Jul. 27, 2019 union	Jul. 27, 2019 USD ($)	Jul. 28, 2018
Commitments and Contingencies Disclosure [Abstract]
Insurance recoveries \| $	$ 415		$ 3,998
Concentration Risk [Line Items]
Number of unions \| union		7
Expiration period of union contracts		1 year
Labor Force Concentration Risk \| Workforce Subject to Collective Bargaining Arrangements
Concentration Risk [Line Items]
Percentage of employees covered by collective bargaining agreements				88.00%
Unionized Employees Concentration Risk \| Workforce Subject to Collective Bargaining Arrangements Expired or Expiring within One Year
Concentration Risk [Line Items]
Percentage of employees covered by collective bargaining agreements				1.00%