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Employee Benefit Plans (Details) (USD $)
 1 Months Ended 11 Months Ended 12 Months Ended
Jul. 26, 2014
Jun. 30, 2014
Jul. 26, 2014
Jul. 27, 2013
Jul. 28, 2012
Multiemployer Plans [Line Items]          
Multiemployer plan contributions     $ 3,679,000 $ 3,205,000 $ 2,882,000
Maximum annual contribution per employee 75.00% 15.00%      
Employer matching contribution     30.00%    
Employer matching contribution percent     5.00%    
Company contributions     1,900,000 1,600,000 1,200,000
Contributions by employer     1,200,000 800,000  
Maximum percent Company contributed to each plan total contributions     5.00%    
The Plan
          
Multiemployer Plans [Line Items]          
Multiemployer plan contributions     3,044,000 2,962,000 2,882,000
Other Plans
          
Multiemployer Plans [Line Items]          
Multiemployer plan contributions     $ 635,000 [1] $ 243,000 [1] $ 0 [1]
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