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Employee Benefit Plans - Narratives (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2016
Jan. 27, 2018
Jan. 25, 2020
Jan. 26, 2019
Jul. 29, 2017
Nov. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined contribution maximum annual contribution for employee     75.00%      
Defined contribution employer match     30.00%      
Defined contribution employer match     5.00%      
Employer contribution amount   $ 1.7 $ 4.1 $ 3.5 $ 5.0  
Multiemployer plan periodic withdraw liability           $ 0.1
Maximum            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Plan contribution     5.00%      
The Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Claim amount $ 13.0