Commitment and Contingencies - Narratives (Details) - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Oct. 28, 2017	Dec. 31, 2016	Jul. 30, 2016	Jul. 29, 2017	Oct. 29, 2016
Loss Contingencies [Line Items]
Loss contingency, estimated loss					$ 13.0
Loss contingency accrual, payments		$ 0.1
Letters of credit outstanding amount	$ 48.7			$ 48.7
Goodman Networks, Inc. Wireline Operations
Loss Contingencies [Line Items]
Escrow deposit	10.0
Funds released from escrow				2.5
Payments to Acquire Businesses, Net of Cash Acquired			$ 100.9
Working Capital Adjustment [Member] | Goodman Networks, Inc. Wireline Operations
Loss Contingencies [Line Items]
Business Acquisition, Working Capital Adjustment			$ 6.6
Indemnification Portion Subject to Certain Conditions, Not Less Than Twelve Months | Goodman Networks, Inc. Wireline Operations
Loss Contingencies [Line Items]
Escrow deposit	22.5
Indemnification Portion Subject to Seller Satisfaction of Certain Liabilities | Goodman Networks, Inc. Wireline Operations
Loss Contingencies [Line Items]
Escrow deposit	10.0
Performance Guarantee and Surety Bond [Member]
Loss Contingencies [Line Items]
Guarantor obligations, carrying value	119.6			$ 118.2
S and N
Loss Contingencies [Line Items]
Damages sought	$ 3.8