Acquisitions (Details) - USD ($) shares in Millions				12 Months Ended
	Nov. 20, 2015	Jan. 30, 2015	Jul. 01, 2013	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Acquisition
Payment of earn-out for the first annual period				$ 4,464,000
Purchase price allocation
Goodwill				$ 272,722,000	$ 228,781,000	$ 228,781,000
Weighted-Average Amortization Period				9 years
Customer relationships
Purchase price allocation
Weighted-Average Amortization Period				7 years
Trademarks
Purchase price allocation
Weighted-Average Amortization Period				7 years
Telegesis
Acquisition
Cash consideration	$ 19,900,000
Amount of initial consideration held in escrow by the company as security for breaches of representations and warranties and certain other expressly enumerated matters	2,900,000
Purchase price allocation
Intangible assets	7,390,000
Cash and cash equivalents	717,000
Other current assets	4,545,000
Goodwill	9,344,000
Other non-current assets	131,000
Current liabilities	(689,000)
Non-current deferred tax liabilities	(1,508,000)
Total purchase price	19,930,000
Acquisition-related costs recorded in selling, general and administrative expenses				$ 500,000
Telegesis | Core and developed technology
Purchase price allocation
Intangible assets	$ 4,980,000
Weighted-Average Amortization Period	7 years
Telegesis | Customer relationships
Purchase price allocation
Intangible assets	$ 2,000,000
Weighted-Average Amortization Period	3 years
Telegesis | Trademarks
Purchase price allocation
Intangible assets	$ 400,000
Weighted-Average Amortization Period	3 years
Telegesis | In-process research and development
Purchase price allocation
Intangible assets	$ 10,000
Bluegiga
Acquisition
Cash consideration		$ 58,000,000
Amount of initial consideration held in escrow by the company as security for breaches of representations and warranties and certain other expressly enumerated matters		9,400,000
Purchase price allocation
Intangible assets		25,450,000
Cash and cash equivalents		1,132,000
Other current assets		6,156,000
Goodwill		34,597,000
Other non-current assets		208,000
Current liabilities		(3,289,000)
Non-current deferred tax liabilities		(3,780,000)
Long-term debt		(2,232,000)
Other non-current liabilities		(220,000)
Total purchase price		$ 58,022,000
Acquisition-related costs recorded in selling, general and administrative expenses				1,200,000
Discount rate applicable to the cash flows (as a percent)		16.10%
Bluegiga | Developed technology
Purchase price allocation
Intangible assets		$ 12,190,000
Weighted-Average Amortization Period		8 years
Bluegiga | Customer relationships
Purchase price allocation
Intangible assets		$ 6,670,000
Weighted-Average Amortization Period		4 years
Bluegiga | Trademarks
Purchase price allocation
Intangible assets		$ 880,000
Weighted-Average Amortization Period		3 years
Bluegiga | In-process research and development
Purchase price allocation
Intangible assets		$ 5,710,000
Energy Micro
Acquisition
Cash consideration				20,000,000
Purchase price of acquisition			$ 140,600,000
Initial consideration			107,400,000
Deferred consideration in the form of a promissory note, fair value			$ 19,200,000
Restricted stock exchanged of promissory note in form of deferred consideration on acquisition			0.5
Mandatory period of creditor notice after which the deferred consideration in the form of a promissory note will be exchanged for the entity's restricted stock			2 months
Earn-Out, fair value			$ 14,000,000
Additional consideration on acquisition			$ 33,300,000	26,700,000
Minimum annual revenue growth for additional consideration (as a percent)			25.00%
Earn out period			5 years
Maximum annual Earn-Out payment			$ 6,666,666
Minimum revenue in single fiscal year from Earn-Out products required to make the entire Earn-Out amount payable			400,000,000
Amount release for the Holdback			$ 20,300,000
Percentage of Earn-Out contingent on the continued employment of certain key employees			28.76%
Period of continued employment of key employees for calculating Earn-out portion following acquisition date			3 years
Payment of earn-out for the first annual period				6,300,000
Earn-out payment representing the Departure Percentage portion and recorded as compensation expense				1,800,000
Remaining Earn-out payment representing additional consideration				$ 4,500,000
Purchase price allocation
Intangible assets			$ 55,400,000
Cash and cash equivalents			919,000
Other current assets			6,486,000
Goodwill			98,515,000
Other non-current assets			3,117,000
Current liabilities			(8,000,000)
Non-current deferred tax liabilities			(6,288,000)
Long-term debt			(8,434,000)
Other non-current liabilities			(1,133,000)
Total purchase price			140,582,000
Acquisition-related costs recorded in selling, general and administrative expenses						$ 2,400,000
Discount rate applicable to the cash flows (as a percent)				13.00%
Energy Micro | Core and developed technology
Purchase price allocation
Intangible assets			$ 29,100,000
Weighted-Average Amortization Period			7 years
Energy Micro | Customer relationships
Purchase price allocation
Intangible assets			$ 6,400,000
Weighted-Average Amortization Period			8 years
Energy Micro | Trademarks
Purchase price allocation
Intangible assets			$ 1,300,000
Weighted-Average Amortization Period			8 years
Energy Micro | In-process research and development
Purchase price allocation
Intangible assets			$ 18,600,000