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Accrued Insurance Claims (Details)
Jul. 28, 2018
USD ($)
Jul. 29, 2017
USD ($)
state
Jul. 30, 2016
USD ($)
Jul. 25, 2015
USD ($)
Accrued Insurance Claims [Line Items]        
Number of states with state-sponsored insurance fund | state   2    
Aggregate stop loss coverage for automobile liability, general liability, and workers' compensation claims before adjustment   $ 103,700,000    
Insurance liability, annual retained risk loss   400,000 $ 400,000 $ 250,000
Accrued insurance   101,900,000 89,700,000  
Accrued insurance claims, Noncurrent   62,007,000 52,835,000  
Other Noncurrent assets        
Accrued Insurance Claims [Line Items]        
Insurance recoveries/receivables related to accrued claims   9,200,000 $ 5,700,000  
Forecasted        
Accrued Insurance Claims [Line Items]        
Aggregate stop loss coverage for automobile liability, general liability, and workers' compensation claims before adjustment $ 67,100,000      
Maximum        
Accrued Insurance Claims [Line Items]        
Retained risk of loss, general liability and workers' compensation, maximum automobile liability   $ 1,000,000