PENSION PLANS - Additional Information (Details) $ in Thousands	12 Months Ended
Jul. 25, 2015 USD ($) pension_plan	Jul. 26, 2014 USD ($) pension_plan	Jul. 27, 2013 USD ($)
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
Expected net actuarial loss to be recognized	$ 1,927
Accumulated benefit obligations	66,809	$ 63,971
Defined Benefit Plan Disclosure [Line Items]
Class A common stock held in plan	651	541
Expected cash contributions next fiscal year	3,000
Company contributions to other multi-employer benefit plans	26,932	25,531	$ 22,421
401(k) company contributions	392	393	377
Company contributions to union sponsored plans	$ 817	$ 813	$ 802
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Minimum target allocation	50.00%
Maximum target allocation	70.00%
Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Minimum target allocation	25.00%
Maximum target allocation	40.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Minimum target allocation	0.00%
Maximum target allocation	10.00%

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503844

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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 (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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The amount of the cost recognized during the period for defined contribution plans.

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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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