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Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 26, 2014	Apr. 27, 2013	Apr. 26, 2014	Apr. 27, 2013	Jul. 27, 2013
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 554,297		$ 554,297		$ 522,141
Less: accumulated depreciation	(348,594)		(348,594)		(319,438)
Property and equipment, net	205,703		205,703		202,703
Depreciation and repairs and maintenance expenses [Abstract]
Depreciation expense	18,602	17,477	55,660	47,065
Repairs and maintenance expense	5,158	5,616	16,397	13,804
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			0 years
Property, Plant and Equipment, Gross	3,409		3,409		3,479
Buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	11,577		11,577		11,449
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,305		5,305		5,154
Vehicles
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	274,265		274,265		258,211
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	75,402		75,402		64,191
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	7,944		7,944		7,915
Equipment and machinery
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 176,395		$ 176,395		$ 171,742
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			35 years
Maximum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			15 years
Maximum | Vehicles
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			5 years
Maximum | Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			10 years
Maximum | Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			7 years
Maximum | Equipment and machinery
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			10 years
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			10 years
Minimum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			1 year
Minimum | Vehicles
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			1 year
Minimum | Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			3 years
Minimum | Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			2 years
Minimum | Equipment and machinery
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			1 year

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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