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Acquisitions - Narratives (Details) $ in Thousands	1 Months Ended								3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($)	Jul. 30, 2016 USD ($)	May 31, 2016 USD ($)	Aug. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Apr. 29, 2015 USD ($)	Jan. 24, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jan. 24, 2015 business	Jul. 29, 2017 USD ($)	Jul. 30, 2016 USD ($)	Jul. 25, 2015 USD ($)
Business Acquisition [Line Items]
Payments to acquire business										$ 26,070	$ 157,183	$ 31,909
Purchase price allocation adjustments										1,504	101
Proceeds from acquisition working capital adjustment										1,825	$ 0	$ 0
Texstar Enterprises, Inc.
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired	$ 26,100
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]
Payments to acquire business		$ 100,900
Escrow deposit										10,000
Funds released from escrow										2,500
Goodman Networks, Inc. Wireline Operations | Fair Value, Measurements, Nonrecurring
Business Acquisition [Line Items]
Purchase price allocation adjustments										1,500
Hewitt Power & Communications, Inc
Business Acquisition [Line Items]
Payment to acquire business, net of cash acquired								$ 8,000
Series of Individually Immaterial Business Acquisitions
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
Working Capital Adjustment | Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Working capital adjustment		$ 6,600
Indemnification Portion Subject to Certain Conditions, Not Less Than Twelve Months | Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Escrow deposit										22,500
Indemnification Portion Subject to Seller Satisfaction of Certain Liabilities | Goodman Networks, Inc. Wireline Operations
Business Acquisition [Line Items]
Escrow deposit										$ 10,000

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