Business Acquisitions (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended		6 Months Ended		0 Months Ended				3 Months Ended	9 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013	Jun. 29, 2014	Dec. 31, 2013	Jun. 29, 2014 Arada Systems [Member]	Jun. 30, 2013 Arada Systems [Member]	Jun. 30, 2013 Arada Systems [Member]	Jun. 21, 2013 Arada Systems [Member]	Jun. 23, 2013 Arada Systems [Member] Technology [Member]	Jun. 21, 2013 Arada Systems [Member] Technology [Member]	Jun. 21, 2013 Arada Systems [Member] US Federal [Member]	Jun. 21, 2013 Arada Systems [Member] State and Local Jurisdiction [Member]	Sep. 29, 2013 Sierra Wireless AirCard Business [Member]	Sep. 29, 2013 Sierra Wireless AirCard Business [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member]	Apr. 04, 2013 Sierra Wireless AirCard Business [Member] In-Process Research and Development [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member] In-Process Research and Development [Member]	Apr. 04, 2013 Sierra Wireless AirCard Business [Member] Technology [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member] Technology [Member]	Apr. 04, 2013 Sierra Wireless AirCard Business [Member] Customer Relationships [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member] Customer Relationships [Member]	Apr. 04, 2013 Sierra Wireless AirCard Business [Member] Noncompete Agreements [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member] Noncompete Agreements [Member]	Apr. 04, 2013 Sierra Wireless AirCard Business [Member] Order Backlog [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member] Order Backlog [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member] US Federal [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member] State and Local Jurisdiction [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member] Foreign Tax Authority [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred									$ 5,300,000							$ 140,000,000
Goodwill, Purchase Accounting Adjustments															500,000
Purchase price, cash paid							1,100,000	4,200,000
Intangible Assets, Other than Goodwill										4,040,000		4,000,000					69,700,000		9,500,000		16,300,000		40,500,000		2,300,000		1,100,000
Goodwill	155,916,000		155,916,000			155,916,000				1,195,000							53,841,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount													700,000	1,200,000														35,800,000	53,800,000	2,300,000
Discount rate used to calculate present value of future cash flows ( in percentage)											21.50%							13.00%		10.00%		12.00%		12.00%		10.00%
Acquired intangible assets, estimated useful life ( in years)											5 years									4 years		8 years		5 years		3 months
In Process Research and Development achieving technological feasibility					7,500,000
Impairment charges	0	2,000,000	0	2,000,000
Indefinite-Lived Intangible Assets (Excluding Goodwill)						$ 100,000