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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
Jan. 26, 2019
Jul. 29, 2017
Jul. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Company Contributions   $ 319 $ 726 $ 384 $ 3,679
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 0 3,057
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 $ 726 $ 384 $ 622