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PENSION PLANS - Additional Information (Details)
$ in Thousands
12 Months Ended
Jul. 28, 2018
USD ($)
Jul. 29, 2017
USD ($)
pension_plan
Jul. 30, 2016
USD ($)
pension_plan
Jul. 25, 2015
USD ($)
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   $ 0 $ (17,904)  
Accumulated benefit obligations   71,701 80,021  
Defined Benefit Plan Disclosure [Line Items]        
Class A common stock held in plan   636 770  
Company contributions to other multi-employer benefit plans   28,137 27,965 $ 26,932
401(k) company contributions   1,132 641 392
Company contributions to union sponsored plans   $ 783 $ 836 $ 817
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]        
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year $ 3,500      
Expected net actuarial loss to be recognized $ 570