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Property and Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 24, 2015
Oct. 25, 2014
Jul. 25, 2015
Property, Plant and Equipment [Line Items]      
Total $ 675,827   $ 624,106
Less: accumulated depreciation (410,342)   (392,542)
Property and equipment, net 265,485   231,564
Depreciation expense $ 22,700 $ 18,800  
Land      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 0 years 0 years  
Total $ 3,475   3,475
Buildings      
Property, Plant and Equipment [Line Items]      
Total 11,944   11,944
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total 10,961   8,491
Vehicles      
Property, Plant and Equipment [Line Items]      
Total 344,497   316,979
Computer hardware and software      
Property, Plant and Equipment [Line Items]      
Total 86,925   80,091
Office furniture and equipment      
Property, Plant and Equipment [Line Items]      
Total 7,604   8,183
Equipment and machinery      
Property, Plant and Equipment [Line Items]      
Total $ 210,421   $ 194,943
Minimum | Buildings      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 10 years 10 years  
Minimum | Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 1 year 1 year  
Minimum | Vehicles      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 1 year 1 year  
Minimum | Computer hardware and software      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 1 year 3 years  
Minimum | Office furniture and equipment      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 1 year 2 years  
Minimum | Equipment and machinery      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 1 year 1 year  
Maximum | Buildings      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 35 years 35 years  
Maximum | Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 10 years 10 years  
Maximum | Vehicles      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 5 years 5 years  
Maximum | Computer hardware and software      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 7 years 10 years  
Maximum | Office furniture and equipment      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 7 years 7 years  
Maximum | Equipment and machinery      
Property, Plant and Equipment [Line Items]      
Estimated Useful Lives 10 years 10 years