Investments in Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 29, 2018	Jun. 29, 2018	Oct. 22, 2014	Sep. 02, 2014
Vislink plc [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent				3.30%
Cost Method Investments Original Cost				$ 3.3
Pebble Beach Systems [Member]
Schedule of Cost-method Investments [Line Items]
Gain on Change in Fair Value of Cost Investment	$ 0.2	$ 0.2
Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			18.40%
Cost Method Investments Original Cost			$ 3.5
Cost-method Investments, Other than Temporary Impairment		$ 0.0