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PENSION PLANS - Additional Information (Details) $ in Thousands | 12 Months Ended
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (n) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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