Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Property, Plant and Equipment [Line Items]
Total	$ 781,493	$ 624,106
Less: accumulated depreciation	(454,823)	(392,542)
Property and equipment, net	326,670	231,564
Depreciation expense	105,514	79,331	$ 74,517
Cost of Property Repairs and Maintenance	29,487	22,054	$ 21,829
Land
Property, Plant and Equipment [Line Items]
Total	3,475	3,475
Buildings
Property, Plant and Equipment [Line Items]
Total	11,969	11,944
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total	13,753	8,491
Vehicles
Property, Plant and Equipment [Line Items]
Total	404,273	316,979
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total	95,570	80,091
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Total	10,374	8,183
Equipment and machinery
Property, Plant and Equipment [Line Items]
Total	$ 242,079	$ 194,943
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	10 years	10 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year	1 year
Minimum | Vehicles
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year	1 year
Minimum | Computer hardware and software
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year	3 years
Minimum | Office furniture and equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year	1 year
Minimum | Equipment and machinery
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	1 year	1 year
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	35 years	35 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	10 years	10 years
Maximum | Vehicles
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	5 years	5 years
Maximum | Computer hardware and software
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	7 years	10 years
Maximum | Office furniture and equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	10 years	7 years
Maximum | Equipment and machinery
Property, Plant and Equipment [Line Items]
Estimated Useful Lives (Years)	10 years	10 years