Acquisitions (Details) - USD ($) $ in Thousands					3 Months Ended	12 Months Ended
	Oct. 03, 2016	Mar. 11, 2016	Nov. 20, 2015	Jan. 30, 2015	Apr. 04, 2015	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Acquisition
Purchase price allocated to goodwill						$ 276,130	$ 272,722	$ 228,781
Payment of earn-out for the first annual period						9,500	4,464
Purchase price allocation
Goodwill						$ 276,130	272,722	228,781
Weighted-Average Amortization Period (Years)						9 years
Customer relationships
Purchase price allocation
Weighted-Average Amortization Period (Years)						7 years
Trademarks
Purchase price allocation
Weighted-Average Amortization Period (Years)						7 years
Telegesis
Acquisition
Cash consideration			$ 19,900
Purchase price allocated to goodwill			9,344
Amount of initial consideration held in escrow by the company as security for breaches of representations and warranties and certain other expressly enumerated matters			2,900
Purchase price allocation
Intangible assets			7,390
Cash and cash equivalents			717
Other current assets			4,545
Goodwill			9,344
Other non-current assets			131
Current liabilities			(689)
Non-current deferred tax liabilities			(1,508)
Total purchase price			19,930
Acquisition-related costs recorded in selling, general and administrative expenses							500
Telegesis | Developed technology
Purchase price allocation
Intangible assets			$ 4,980
Weighted-Average Amortization Period (Years)			7 years
Telegesis | Customer relationships
Purchase price allocation
Intangible assets			$ 2,000
Weighted-Average Amortization Period (Years)			3 years
Telegesis | Trademarks
Purchase price allocation
Intangible assets			$ 400
Weighted-Average Amortization Period (Years)			3 years
Telegesis | In-process research and development
Purchase price allocation
Intangible assets			$ 10
Bluegiga
Acquisition
Cash consideration				$ 58,000
Purchase price allocated to goodwill				34,597
Purchase price allocation
Intangible assets				25,450
Cash and cash equivalents				1,132
Other current assets				6,156
Goodwill				34,597
Other non-current assets				208
Current liabilities				(3,289)
Non-current deferred tax liabilities				(3,780)
Long-term debt				(2,232)
Other non-current liabilities				(220)
Total purchase price				$ 58,022
Acquisition-related costs recorded in selling, general and administrative expenses							1,200
Discount rate applicable to the cash flows (as a percent)				16.10%
Bluegiga | Developed technology
Purchase price allocation
Intangible assets				$ 12,190
Weighted-Average Amortization Period (Years)				8 years
Bluegiga | Customer relationships
Purchase price allocation
Intangible assets				$ 6,670
Weighted-Average Amortization Period (Years)				4 years
Bluegiga | Trademarks
Purchase price allocation
Intangible assets				$ 880
Weighted-Average Amortization Period (Years)				3 years
Bluegiga | In-process research and development
Purchase price allocation
Intangible assets				$ 5,710
Energy Micro
Acquisition
Cash consideration					$ 20,000
Payment of earn-out for the first annual period					$ 6,300
Earn-out payment representing the Departure Percentage portion and recorded as compensation expense								$ 1,800
Remaining Earn-out payment representing additional consideration						$ 4,500
Earn-Out, fair value		$ 16,000
Potential maximum contingent consideration that could be paid		26,700
Additional consideration		11,400
Compensation expense		$ 4,600				2,700	$ 1,900
Gain from the adjustment to fair value due to settlement						2,700
Micrium
Acquisition
Total consideration	$ 12,400
Cash consideration	8,200
Stock consideration	4,200
Additional stock consideration based on economic substance	$ 1,000
Post-combination compensation expense recognition period (in years)	4 years
Consideration held in escrow	$ 1,500
Purchase price allocated to intangible assets	9,500					9,500
Purchase price allocated to goodwill	3,400
Purchase price allocated to net tangible assets	(500)
Purchase price allocation
Goodwill	$ 3,400
Micrium | Selling, general and administrative
Acquisition
Acquisition-related costs						$ 300