Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010
Operating Activities
Net income	$ 22,667	$ 60,359
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	10,119	8,736
Amortization of other intangible assets and other assets	8,570	5,461
Stock-based compensation expense	27,224	31,261
Income tax benefit from employee stock-based awards	2,301	2,855
Excess income tax benefit from employee stock-based awards	(2,111)	(2,008)
Deferred income taxes	2,011	(1,649)
Changes in operating assets and liabilities:
Accounts receivable	(11,581)	(7,429)
Inventories	1,670	(6,487)
Prepaid expenses and other assets	227	(5,527)
Accounts payable	871	607
Accrued expenses	819	(145)
Deferred income on shipments to distributors	1,495	4,723
Income taxes	1,287	(7,275)
Net cash provided by operating activities	65,569	83,482
Investing Activities
Purchases of available-for-sale investments	(113,784)	(293,502)
Proceeds from sales and maturities of marketable securities	166,262	277,541
Purchases of property and equipment	(7,472)	(6,792)
Purchases of other assets	(891)	(7,147)
Acquisitions of businesses, net of cash acquired	(27,262)	(18,351)
Net cash provided by (used in) investing activities	16,853	(48,251)
Financing Activities
Proceeds from issuance of common stock, net of shares withheld for taxes	2,320	15,006
Excess income tax benefit from employee stock-based awards	2,111	2,008
Repurchases of common stock	(110,063)	(140,331)
Payments on debt	(7,174)
Net cash used in financing activities	(112,806)	(123,317)
Decrease in cash and cash equivalents	(30,384)	(88,086)
Cash and cash equivalents at beginning of period	138,567	195,737
Cash and cash equivalents at end of period	$ 108,183	$ 107,651