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Employee Savings Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 29, 2016
Jul. 31, 2015
Aug. 01, 2014
Defined Contribution Plan Disclosures [Line Items]      
Percentage of company match to employee contribution 25.00% 25.00% 25.00%
Percentage of company contributions that vests annually 20.00% 20.00% 20.00%
Percentage of company contribution that vests on employee's fifth anniversary of employment 100.00% 100.00% 100.00%
Maximum [Member]      
Defined Contribution Plan Disclosures [Line Items]      
Percentage of employee's compensation matched by company 6.00% 6.00% 6.00%
401(k) Savings Plan [Member]      
Defined Contribution Plan Disclosures [Line Items]      
Requisite service period 90 days    
Minimum age of eligible employees required 21 years    
Percentage of compensation allowed to be deferred by eligible employees 50.00%    
Company contribution to the plan during the period $ 2,528 $ 2,364 $ 2,167
Non-Qualified Savings Plan [Member]      
Defined Contribution Plan Disclosures [Line Items]      
Percentage of compensation allowed to be deferred by eligible employees 50.00%    
Percentage of eligible bonuses allowed to be deferred 100.00%    
Market value of the trust assets $ 27,764    
Liability obligations to participants 27,764    
Company contribution to the plan during the period $ 296 $ 234 $ 253