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Acquisitions (Details) (USD $)			3 Months Ended
	Oct. 25, 2014	Jul. 26, 2014	Oct. 25, 2014 Hewitt Power & Communications, Inc	Apr. 26, 2014 Telecommunications Specialty Construction Contractor, Canada	Jul. 26, 2014 Watts Brothers	Oct. 25, 2014 Watts Brothers
Business Acquisition [Line Items]
Acquisition payments			$ 8,000,000	$ 700,000	$ 16,400,000
Finite-Lived Intangible Assets, Gross			5,800,000
Business Acquisition, Cost of Acquired Entity, Cash Paid For Working Capital						300,000
Goodwill	269,465,000	269,088,000				1,600,000
Finite-Lived Customer Relationships, Gross						8,500,000
Property, Plant and Equipment, Gross	$ 573,039,000	$ 558,710,000				$ 3,700,000

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Business Acquisition, Cost of Acquired Entity, Cash Paid For Working Capital

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Gross carrying amount before accumulated amortization as of the balance sheet date to an asset acquired in a business combination representing a favorable existing relationship with customers having a finite beneficial life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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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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