Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Apr. 23, 2016	Jul. 25, 2015	Apr. 25, 2015	Apr. 23, 2016	Apr. 25, 2015
Property, Plant and Equipment [Line Items]
Total	$ 751,190	$ 624,106		$ 751,190
Less: accumulated depreciation	(441,407)	(392,542)		(441,407)
Property and equipment, net	309,783	$ 231,564		309,783
Depreciation expense	$ 27,000		$ 19,800	74,900	$ 57,800
Land
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	0 years	0 years
Total	$ 3,475	$ 3,475		3,475
Buildings
Property, Plant and Equipment [Line Items]
Total	11,979	11,944		11,979
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total	13,164	8,491		13,164
Vehicles
Property, Plant and Equipment [Line Items]
Total	387,444	316,979		387,444
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total	94,529	80,091		94,529
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Total	10,051	8,183		10,051
Equipment and machinery
Property, Plant and Equipment [Line Items]
Total	$ 230,548	$ 194,943		$ 230,548
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