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Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Jul. 26, 2014
Jul. 27, 2013
Jul. 28, 2012
Loss Contingencies [Line Items]      
Construction liens $ 17,700,000    
Operating lease expense excluding related party transactions 17,700,000 15,300,000 10,600,000
Rental expense 20,400,000 19,000,000 9,900,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Future minimum payments due 2015 14,902,000    
Future minimum payments due 2016 12,209,000    
Future minimum payments due 2017 7,784,000    
Future minimum payments due 2018 4,459,000    
Future minimum payments due 2019 3,017,000    
Future minimum payments due thereafter 8,249,000    
Operating Leases, Future Minimum Payments Due 50,620,000    
Credit Agreement, December 3, 2012, Maturing December 2017 | Revolving Credit Facility | Standby Letters of Credit
      
Loss Contingencies [Line Items]      
Letters of credit outstanding amount 49,400,000 46,700,000  
Prior Credit Agreement Which Has Been Terminated or Replaced | Revolving Credit Facility | Standby Letters of Credit
      
Loss Contingencies [Line Items]      
Letters of credit outstanding amount   46,700,000  
Performance Guarantee and Surety Bond
      
Loss Contingencies [Line Items]      
Outstanding performance and other surety contract bonds 446,800,000 446,500,000  
Other Accrued Liabilities
      
Loss Contingencies [Line Items]      
Settlement liability $ 600,000