PENSION PLANS - Additional Information (Details) $ in Thousands	12 Months Ended
Jul. 28, 2018 USD ($) pension_plan	Jul. 29, 2017 USD ($) pension_plan
Compensation Related Costs [Abstract]
Number of defined benefit plans \| pension_plan	4	4,000
Number of defined benefit plans covering union members \| pension_plan	2
Number of defined benefit plans covering non-union members \| pension_plan	1
Pre-tax remeasurement gain in accumulated other comprehensive loss		$ 629
Loss on settlement	$ 866	965
Expected net actuarial loss to be recognized	583
Accumulated benefit obligations	69,553	71,701
Expected contribution amount in next fiscal year	3,000
Company contributions to other multi-employer benefit plans	27,713	28,137
401(k) company contributions	1,260	1,132
Company contributions to union sponsored plans	820	783
Defined Benefit Plan Disclosure [Line Items]
Class A common stock held in plan	611	636
Level 1
Defined Benefit Plan Disclosure [Line Items]
Class A common stock held in plan	$ 611	$ 636
Minimum \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	25.00%
Minimum \| Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	65.00%
Minimum \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	0.00%
Maximum \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	35.00%
Maximum \| Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	75.00%
Maximum \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	10.00%

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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The amount of employer securities or securities of parties related to the employer that are included in plan assets.

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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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Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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-Publisher FASB
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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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Amount of cost for defined contribution plan.

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Defined Benefit Plan, Number of Plans

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Defined Benefit Plan, Number of Plans Covering Non-Union Members

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Defined Benefit Plan, Number of Plans Covering Union Members

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