Investments in Other Equity Securities Investments in Other Equity Securities (Details) - USD ($)		1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
		Sep. 30, 2014	Jul. 03, 2015	Apr. 03, 2015	Jun. 27, 2014	Jul. 03, 2015	Jun. 27, 2014	Dec. 31, 2014	Oct. 22, 2014	Sep. 26, 2014	Sep. 02, 2014
Schedule of Cost-method Investments [Line Items]
Prepaid expenses and other current assets			$ 28,860,000			$ 28,860,000		$ 17,539,000
Cost Method Investments Carrying Value			7,200,000			7,200,000		8,600,000
Loss on impairment of long-term investment						2,505,000	$ 0
Research and development			21,816,000		$ 23,485,000	44,145,000	$ 47,373,000
VJU GmbH [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent										19.80%
Cost Method Investments Original Cost										$ 2,500,000
Loss on impairment of long-term investment				$ 2,500,000
Research and development		$ 100,000
Vislink plc [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent											3.30%
Cost Method Investments Original Cost			3,300,000			3,300,000					$ 3,300,000
Prepaid expenses and other current assets			0			0					$ 3,300,000
Cost Method Investments Carrying Value			3,600,000			3,600,000		2,600,000
Unrealized Loss on Cost Method Investments						200,000		$ (700,000)
Loss on impairment of long-term investment						0
EDC [Member]
Schedule of Cost-method Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent									18.40%
Cost Method Investments Original Cost									$ 3,500,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value			3,593,000			3,593,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1]		3,593,000			3,593,000
Variable Interest Entity, Not Primary Beneficiary [Member] | VJU GmbH [Member]
Schedule of Cost-method Investments [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1]		0			0
Variable Interest Entity, Not Primary Beneficiary [Member] | EDC [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value	[2]		3,593,000			3,593,000
Business Acquisition, Transaction Costs	[2]		100,000			100,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	[1],[2]		3,593,000			3,593,000
Cost-method Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | VJU GmbH [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments Carrying Value			$ 0			$ 0

[1] The Company did not provide financial support to any of its unconsolidated VIEs and as of July 3, 2015, there were no explicit arrangements or implicit variable interests that could require the Company to provide financial support to any of its unconsolidated VIEs.

[2] The Company’s maximum exposure to loss with respect to EDC as of July 3, 2015 was limited to a total investment cost of $3.6 million, including $0.1 million of transaction costs.