Acquisitions (Details) $ in Millions	1 Months Ended	3 Months Ended						12 Months Ended
	Jul. 30, 2016 USD ($)	Oct. 24, 2015 USD ($)	Jul. 25, 2015 USD ($)	Jan. 24, 2015 USD ($) business	Oct. 25, 2014 USD ($)	Jul. 26, 2014 USD ($)	Apr. 26, 2014 USD ($)	Jul. 30, 2016 USD ($)	Jul. 25, 2015 USD ($)	Jul. 26, 2014 USD ($)
Business Acquisition [Line Items]
Amortization of Intangible Assets								$ 19.4	$ 16.7	$ 18.3
TelCom Construction, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired		$ 48.8
Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Escrow Deposit	$ 22.5							22.5
Payment to acquire business, net of cash acquired	107.5
Business Combination, Consideration Transferred	102.8
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	4.7
NextGen Telecom Services Group, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired	5.6
Hewitt Power & Communications, Inc
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired					$ 8.0
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired				$ 1.5		$ 16.4	$ 0.7
Number of businesses acquired | business				2
Moll's Utility Services, LLC
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired			$ 6.5
Venture Communications Group, LLC
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired			$ 15.6
Businesses Acquired, Fiscal 2016
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual								119.8
Amortization of Intangible Assets								2.1
Working Capital Adjustment [Member] | Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Escrow Deposit	2.5							2.5
Indemnification Agreement [Member] | Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Escrow Deposit	20.0							20.0
Indemnification Portion Subject to Certain Conditions, Not Less Than Twelve Months | Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Escrow Deposit	10.0							10.0
Indemnification Portion Subject to Seller Satisfaction of Certain Liabilities | Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Escrow Deposit	10.0							10.0
Seller Liability, Satisfaction Required for Contingent Consideration	$ 31.7							$ 31.7