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Acquisitions (Details) $ in Thousands	3 Months Ended
	Oct. 24, 2015 USD ($)	Jul. 25, 2015 USD ($)	Jan. 24, 2015 USD ($) business	Oct. 25, 2014 USD ($)	Apr. 23, 2016 USD ($)	Aug. 07, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 271,653			$ 281,448
TelCom Construction, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired	$ 48,800
Property and equipment						$ 10,800
Goodwill						9,700
Hewitt Power & Communications, Inc
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired				$ 8,000
Cable Installation Contractors
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired			$ 1,500
Number of businesses acquired | business			2
Moll's Utility Services, LLC
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired		6,500
Venture Communications Group, LLC
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired		$ 15,600
Customer relationships | TelCom Construction, Inc.
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						$ 16,200

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The amount of identifiable intangible assets recognized as of the acquisition date.

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