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Employee Benefit Plans - Contribution Details (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2016
Jan. 27, 2018
Jul. 29, 2017
Jul. 30, 2016
Jul. 25, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Company Contributions   $ 319 $ 384 $ 3,679 $ 4,786
The Plan (EIN 13-6123601)          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Multiemployer lans, certified zone status   Green      
Multiemployer plans, FIP/RP Status   No      
Company Contributions   $ 0 0 3,057 3,852
Surcharge Imposed   No      
Expiration Date of CBA   May 05, 2016      
Claim amount $ 13,000        
Other Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Company Contributions   $ 319 $ 384 $ 622 $ 934