Acquisitions (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
	Jul. 30, 2016	Jan. 28, 2017	Jan. 23, 2016	Oct. 24, 2015	Jan. 28, 2017	Jan. 23, 2016
Business Acquisition [Line Items]
Purchase price allocation adjustments					$ 2,501
Amortization of intangible assets		$ 6,100	$ 4,700		12,300	$ 9,500
TelCom Construction, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired				$ 48,800
NextGen Telecom Services Group, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired	$ 5,600
Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired	107,500
Escrow Deposit		20,000			20,000
Goodman Networks, Inc. Wireline Operations | Fair Value, Measurements, Nonrecurring [Member]
Business Acquisition [Line Items]
Purchase price allocation adjustments					2,500
Working Capital Adjustment [Member] | Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	$ 6,600
Indemnification Portion Subject to Certain Conditions, Not Less Than Twelve Months | Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Escrow Deposit		10,000			10,000
Indemnification Portion Subject to Seller Satisfaction of Certain Liabilities | Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Escrow Deposit		10,000			10,000
Seller Liability, Satisfaction Required for Contingent Consideration		$ 31,700			$ 31,700