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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

The amount of employer securities or securities of parties related to the employer that are included in plan assets.

+ References

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- Definition

The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(10)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Curtailment
-URI http://asc.fasb.org/extlink&oid=6520938

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 15
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927

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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.

+ References

No definition available.

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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.

+ References

No definition available.

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
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- Definition

Target allocation minimum 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920

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- Definition

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.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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Defined Benefit Plan, Number of Plans

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No definition available.

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- Definition

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

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No definition available.

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Defined Benefit Plan, Number of Plans Covering Union Members

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- References

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PENSION PLANS - Additional Information (Details)	12 Months Ended
PENSION PLANS - Additional Information (Details)	Jul. 29, 2017 USD ($)	Jul. 30, 2016 USD ($) pension_plan	Jul. 25, 2015 USD ($) pension_plan	Jul. 26, 2014 USD ($)
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
Defined Benefit Plan, Curtailments		$ 17,904,000	$ 0
Accumulated benefit obligations		80,021,000	66,809,000
Defined Benefit Plan Disclosure [Line Items]
Class A common stock held in plan		770,000	651,000
Company contributions to other multi-employer benefit plans		27,965,000	26,932,000	$ 25,531,000
401(k) company contributions		641,000	392,000	393,000
Company contributions to union sponsored plans		$ 836,000	$ 817,000	$ 813,000
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%
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected net actuarial loss to be recognized	$ 1,511,000
Expected cash contributions next fiscal year	$ 3,000,000