PENSION PLANS - Additional Information (Details) $ in Thousands	12 Months Ended
Jul. 27, 2019 USD ($) pension_plan	Jul. 28, 2018 USD ($) pension_plan
Compensation Related Costs [Abstract]
Number of defined benefit plans \| pension_plan	4	4,000
Number of defined benefit plans frozen \| pension_plan	3
Number of defined benefit plans covering union members \| pension_plan	2
Number of defined benefit plans covering non-union members \| pension_plan	1
Loss on settlement	$ 441	$ 866
Expected net actuarial loss to be recognized	1,900
Accumulated benefit obligations	$ 69,932	69,553
Number of multi-employer pension plans \| pension_plan	3
Company contributions to other multi-employer benefit plans	$ 28,325	27,713
401(k) company contributions	1,390	1,260
Company contributions to union sponsored plans	755	820
Defined Benefit Plan Disclosure [Line Items]
Class A common stock held in plan	568	611
Level 1
Defined Benefit Plan Disclosure [Line Items]
Class A common stock held in plan	$ 568	$ 611
Minimum \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	5.00%
Minimum \| Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	85.00%
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	15.00%
Maximum \| Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	95.00%
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.

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Amount of employer security in which defined benefit plan asset is invested. Includes, but is not limited to, security issued or managed by related party of employer.

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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.

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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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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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Multiemployer Plans, Number Of Plans

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