Acquisitions (Details) - USD ($)			3 Months Ended	9 Months Ended
	Jan. 30, 2015	Jul. 01, 2013	Apr. 04, 2015	Oct. 03, 2015	Jan. 03, 2015
Acquisition
Payment of earn-out for the first annual period				$ 4,464,000
Purchase price allocation
Goodwill				263,925,000	$ 228,781,000
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	35,145,000
Other non-current assets	208,000
Current liabilities	(3,289,000)
Non-current deferred tax liabilities, net	(4,328,000)
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
Earn-Out, fair value		$ 14,000,000
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 of initial consideration held in escrow by the company as security for breaches of representations and warranties and certain other expressly enumerated matters		$ 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