Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Current:
Domestic	$ 14,468,000	$ 10,824,000	$ (11,560,000)
International	2,845,000	4,145,000	5,538,000
Total Current	17,313,000	14,969,000	(6,022,000)
Deferred:
Domestic	(70,000)	(192,000)	2,234,000
International	(375,000)	(360,000)	(338,000)
Total Deferred	(445,000)	(552,000)	1,896,000
Provision (benefit) for income taxes	16,868,000	14,417,000	(4,126,000)
Effective income tax rate reconciliation
Federal statutory rate (as a percent)	35.00%	35.00%	35.00%
Foreign tax rate benefit (as a percent)	(11.00%)	(15.60%)	(16.70%)
Research and development tax credits (as a percent)	(8.50%)	(6.10%)	(3.10%)
Release of prior year unrecognized tax benefits (as a percent)		(3.60%)	(23.40%)
Intercompany technology license (as a percent)	10.40%	4.40%
Excess officer compensation (as a percent)	3.20%	2.00%	1.80%
Nondeductible acquisition costs	2.90%
Other (as a percent)	0.20%	0.30%	0.40%
Effective income tax rate (as a percent)	32.20%	16.40%	(6.00%)
Income before income taxes, related to foreign operations	4,100,000	40,100,000	39,500,000
Undistributed earnings of foreign subsidiaries	265,300,000
Deferred tax assets:
Net operating loss carryforwards	21,479,000	10,927,000
Research and development tax credit carryforwards	5,556,000	4,880,000
Stock-based compensation	9,963,000	10,204,000
Depreciable assets	34,762,000	31,489,000
Reserves and allowances	122,000	136,000
Unrealized losses on available-for-sale securities	629,000	631,000
Unrealized losses on cash flow hedges	699,000	1,334,000
Deferred income on shipments to distributors	3,895,000	3,299,000
Accrued liabilities and other	5,855,000	4,559,000
Deferred tax assets	82,960,000	67,459,000
Deferred tax assets, net	82,960,000	67,459,000
Deferred tax liabilities:
Acquired intangibles	18,562,000	15,536,000
Long term obligations for tax purposes	33,023,000	33,023,000
Prepaid expenses and other	913,000	1,234,000
Deferred tax liabilities	52,498,000	49,793,000
Net deferred tax assets	$ 30,462,000	$ 17,666,000