Accrued Insurance Claims (Details)	Jul. 30, 2016 USD ($)	Jan. 23, 2016 USD ($) state	Oct. 24, 2015 USD ($)	Jul. 25, 2015 USD ($)
Accrued Insurance Claims [Line Items]
Number of States with State-Sponsored Insurance Fund | state		2
Insurance liability, annual retained risk loss		$ 400,000	$ 250,000
Retained risk of loss per participant for employee health plan for claim amounts that aggregate across all participants in excess of $250,000		425,000	550,000
Health plan participant threshold		400,000	$ 250,000
Accrued insurance		88,500,000		$ 87,300,000
Accrued insurance claims, Noncurrent		50,994,000		51,476,000
Insurance recoveries/receivables related to accrued claims		5,900,000		9,500,000
Other Current Assets
Accrued Insurance Claims [Line Items]
Insurance recoveries/receivables related to accrued claims				600,000
Non-Current Other Assets
Accrued Insurance Claims [Line Items]
Insurance recoveries/receivables related to accrued claims		5,900,000		$ 8,900,000
Scenario, Forecast
Accrued Insurance Claims [Line Items]
Aggregate stop loss coverage for automobile liability, general liability, and workers' compensation claims before adjustment	$ 84,600,000
Maximum
Accrued Insurance Claims [Line Items]
Retained risk of loss, general liability and workers' compensation, maximum automobile liability		$ 1,000,000