Acquisitions - Narratives (Details) $ in Thousands	1 Months Ended								3 Months Ended	6 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	Jan. 27, 2018 USD ($)	Jul. 29, 2017 USD ($)	Jul. 30, 2016 USD ($)	Jul. 25, 2015 USD ($)
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired										$ 0	$ 26,070	$ 157,183	$ 31,909
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 Businesses, Net of Cash Acquired		$ 100,900
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]
Business Acquisition, Working Capital Adjustment		$ 6,600