Income Taxes (Details) (USD $)	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Current:
Domestic	$ 7,083,000	$ 4,796,000	$ 21,084,000
International	882,000	4,093,000	(3,009,000)
Total Current	7,965,000	8,889,000	18,075,000
Deferred:
Domestic	2,352,000	5,591,000	5,444,000
International	702,000	(2,272,000)	(719,000)
Total Deferred	3,054,000	3,319,000	4,725,000
Income tax expense	11,019,000	12,208,000	22,800,000
Effective income tax rate reconciliation
Federal statutory rate (as a percent)	35.00%	35.00%	35.00%
Foreign tax rate benefit (as a percent)	(3.50%)	(8.20%)	(11.80%)
Research and development tax credits (as a percent)	(8.60%)	(12.80%)	(0.50%)
Release of prior year unrecognized tax benefits (as a percent)	(2.60%)		(8.40%)
Intercompany technology license (as a percent)			11.80%
Excess officer compensation (as a percent)	2.30%	1.90%	1.00%
Change in prior period valuation allowance	(1.40%)	3.10%
Other (as a percent)	1.30%	0.70%	(0.70%)
Effective income tax rate (as a percent)	22.50%	19.70%	26.40%
Undistributed earnings of foreign subsidiaries	303,100,000
Income before income taxes
Domestic	38,174,000	41,849,000	80,494,000
Foreign	10,866,000	20,178,000	5,854,000
Valuation allowance related to certain state loss and research and development tax credit carryforwards	500,000	(600,000)
Release of valuation allowance due to the expiration of certain state net operating loss carryforwards	100,000
Reduction of valuation allowance related to an adjustment of certain acquired state net operating losses and research and development tax credit carryforwards		200,000
Deferred tax assets:
Net operating loss carryforwards	31,518,000	38,399,000
Research and development tax credit carryforwards	9,740,000	9,276,000
Stock-based compensation	6,353,000	6,757,000
Capitalized research and development	7,371,000	8,999,000
Deferred income on shipments to distributors	8,117,000	5,733,000
Accrued liabilities and other	6,481,000	8,302,000
Deferred tax assets	69,580,000	77,466,000
Less: Valuation allowance	(3,455,000)	(3,775,000)
Deferred tax assets, net	66,125,000	73,691,000
Deferred tax liabilities:
Acquired intangible assets	33,630,000	38,444,000
Depreciation and amortization	3,388,000	2,022,000
Prepaid expenses and other	1,517,000	1,889,000
Deferred tax liabilities	38,535,000	42,355,000
Net deferred tax assets	$ 27,590,000	$ 31,336,000