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Income Taxes (Details) (USD $)
 12 Months Ended
Jul. 26, 2014
Jul. 27, 2013
Jul. 28, 2012
Current: [Abstract]      
Federal current $ 27,161,000 $ 22,173,000 $ 11,263,000
Foreign current 416,000 406,000 568,000
State current 5,087,000 2,702,000 3,478,000
Total current 32,664,000 25,281,000 15,309,000
Deferred: [Abstract]      
Federal deferred (5,706,000) (2,866,000) 9,392,000
Foreign deferred 0 6,000 49,000
State deferred (617,000) 590,000 433,000
Total deferred (6,323,000) (2,270,000) 9,874,000
Total 26,341,000 23,011,000 25,183,000
Deferred Tax Assets [Abstract]      
Insurance and other reserves 26,964,000 23,089,000  
Allowance for doubtful accounts and reserves 742,000 427,000  
Net operating loss carryforwards 994,000 1,183,000  
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 5,402,000 4,231,000  
Other 1,062,000 1,800,000  
Total deferred tax assets 35,164,000 30,730,000  
Valuation allowance (878,000) (1,788,000)  
Deferred tax assets, net of valuation allowance 34,286,000 28,942,000  
Deferred Tax Liabilities [Abstract]      
Property and equipment 32,164,000 36,491,000  
Goodwill and intangibles 26,998,000 23,498,000  
Other 553,000 712,000  
Deferred tax liabilities 59,715,000 60,701,000  
Net deferred tax liabilities 25,429,000 31,759,000  
Income taxes receivable 2,200,000 2,500,000  
Income taxes payable 5,223,000 2,337,000  
Valuation allowance deferred tax asset change in amount 800,000    
Valuation allowance, amount 878,000 1,788,000  
Changes In Unrecognized Tax Benefits, Income Tax Penalties And Interest Accrued      
Balance at beginning of year 2,348,000 2,194,000 2,054,000
Additions based on tax positions related to the fiscal year 137,000 155,000 154,000
Additions based on tax positions related to prior years 10,000 19,000 6,000
Reductions related to the expiration of statues of limitation (94,000) (20,000) (20,000)
Balance at end of year 2,401,000 2,348,000 2,194,000
Payment of interest and penalties accrued   $ 800,000