Business Acquisitions (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended		0 Months Ended				9 Months Ended		0 Months Ended			0 Months Ended			0 Months Ended		0 Months Ended		0 Months Ended					9 Months Ended			0 Months Ended						9 Months Ended			0 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 29, 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]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member]	Apr. 04, 2013 Sierra Wireless AirCard Business [Member] In-Process Research and Development [Member]	Sep. 29, 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]	Sep. 29, 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] Foreign Tax Authority [Member]	Apr. 02, 2013 Sierra Wireless AirCard Business [Member] State and Local Jurisdiction [Member]	Sep. 29, 2013 Avaak Inc. [Member]	Sep. 30, 2012 Avaak Inc. [Member]	Jul. 03, 2012 Avaak Inc. [Member]	Jul. 03, 2012 Avaak Inc. [Member] In-Process Research and Development [Member]	Jul. 03, 2012 Avaak Inc. [Member] Technology [Member]	Jul. 03, 2012 Avaak Inc. [Member] Customer Relationships [Member]	Jul. 03, 2012 Avaak Inc. [Member] Trade Names and Trademarks [Member]	Jul. 03, 2012 Avaak Inc. [Member] US Federal [Member]	Jul. 03, 2012 Avaak Inc. [Member] State and Local Jurisdiction [Member]	Sep. 29, 2013 Firetide, Inc. [Member]	Sep. 30, 2012 Firetide, Inc. [Member]	Jun. 04, 2012 Firetide, Inc. [Member]	Jun. 04, 2012 Firetide, Inc. [Member] Technology [Member]	Jun. 04, 2012 Firetide, Inc. [Member] US Federal [Member]	Jun. 04, 2012 Firetide, Inc. [Member] State and Local Jurisdiction [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred						$ 5,250,000						$ 140,000,000																		$ 24,000,000									$ 7,200,000
Goodwill, Purchase Accounting Adjustments												500,000
Business Acquisition, Percentage of Voting Interests Acquired																															100.00%
Purchase price, cash paid						4,200,000																							2,400,000	21,600,000								600,000	6,600,000
Business Acquisition Cost of Acquired Entity, Cash To Be Paid At Future Date						1,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, 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						6,000,000	2,000,000	2,300,000	300,000	1,400,000					4,159,000
Goodwill	155,916,000		155,916,000		100,880,000		1,195,000						53,841,000																		11,895,000									3,041,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount										700,000	1,200,000															36,600,000	2,300,000	53,800,000								0	0					1,600,000	3,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent																															5,937,000
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%									14.00%	14.00%	16.00%						22.00%
Acquired intangible assets, estimated useful life ( in years)								5 years						4 years			4 years			8 years		5 years											5 years	5 years	5 years						5 years
In Process Research and Development achieving technological feasibility															7,400,000			7,400,000
IPR&D Reaching Technical Feasibility Useful Life																																4 years
Impairment charges	2,000,000	0	2,000,000	0								2,000,000
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 100,000		$ 100,000		$ 1,000,000							$ 100,000