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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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- Definition 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 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition 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 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (n) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + Details
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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. + 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)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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