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Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 26, 2014	Jul. 27, 2013	Jul. 28, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 558,710	$ 522,141
Less: accumulated depreciation	(353,297)	(319,438)
Property and equipment, net	205,413	202,703
Depreciation and repairs and maintenance expenses [Abstract]
Depreciation expense	74,517	64,756	56,187
Repairs and maintenance expense	21,829	19,408	15,623
Land
Property, Plant and Equipment [Line Items]
General useful life	0 years
Property, plant and equipment, gross	3,408	3,479
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,589	11,449
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,335	5,154
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	279,631	258,211
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	73,349	64,191
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,790	7,915
Equipment and machinery
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 177,608	$ 171,742
Maximum | Buildings
Property, Plant and Equipment [Line Items]
General useful life	35 years
Maximum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
General useful life	10 years
Maximum | Vehicles
Property, Plant and Equipment [Line Items]
General useful life	5 years
Maximum | Computer hardware and software
Property, Plant and Equipment [Line Items]
General useful life	10 years
Maximum | Office furniture and equipment
Property, Plant and Equipment [Line Items]
General useful life	7 years
Maximum | Equipment and machinery
Property, Plant and Equipment [Line Items]
General useful life	10 years
Minimum | Buildings
Property, Plant and Equipment [Line Items]
General useful life	10 years
Minimum | Leasehold Improvements
Property, Plant and Equipment [Line Items]
General useful life	1 year
Minimum | Vehicles
Property, Plant and Equipment [Line Items]
General useful life	1 year
Minimum | Computer hardware and software
Property, Plant and Equipment [Line Items]
General useful life	3 years
Minimum | Office furniture and equipment
Property, Plant and Equipment [Line Items]
General useful life	2 years
Minimum | Equipment and machinery
Property, Plant and Equipment [Line Items]
General 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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-Section S99

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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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.

+ References

No definition available.

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