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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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Percentage of entity's employees covered by collective-bargaining arrangement (CBA) to all entity's employees in multiemployer pension plan determined to be individually insignificant.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (d)
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Percentage of entity's employees covered by collective-bargaining arrangement (CBA) to all entity's employees in multiemployer pension plan determined to be individually significant.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 80
-Section 50
-Paragraph 5
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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)	3 Months Ended	12 Months Ended	93 Months Ended
COMMITMENTS and CONTINGENCIES (Details)	Jul. 31, 2021 USD ($)	Jul. 31, 2021 union	Jul. 25, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Insurance recoveries \| $	$ 2,733,000		$ 6,730
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, significant		89.00%
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, insignificant		10.00%