Condensed Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010
Operating Activities
Net income	$ 11,412	$ 42,126
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	6,680	5,821
Amortization of other intangible assets and other assets	6,077	3,651
Stock-based compensation expense	18,074	20,931
Income tax benefit from employee stock-based awards	2,083	2,523
Excess income tax benefit from employee stock-based awards	(1,963)	(1,784)
Deferred income taxes	181	(319)
Changes in operating assets and liabilities:
Accounts receivable	(23,562)	(19,946)
Inventories	2,022	2,537
Prepaid expenses and other assets	(1,021)	3,208
Accounts payable	259	3,015
Accrued expenses	(2,841)	(4,445)
Deferred income on shipments to distributors	5,157	483
Income taxes	3,672	(5,268)
Net cash provided by operating activities	26,230	52,533
Investing Activities
Purchases of available-for-sale investments	(75,856)	(216,385)
Proceeds from sales and maturities of marketable securities	104,831	158,944
Purchases of property and equipment	(5,058)	(3,311)
Purchases of other assets	(665)	(6,917)
Acquisitions of businesses, net of cash acquired	(27,262)	(18,351)
Net cash used in investing activities	(4,010)	(86,020)
Financing Activities
Proceeds from issuance of common stock, net of shares withheld for taxes	2,489	17,244
Excess income tax benefit from employee stock-based awards	1,963	1,784
Repurchases of common stock	(23,241)	(100,309)
Payments on debt	(7,174)
Net cash used in financing activities	(25,963)	(81,281)
Decrease in cash and cash equivalents	(3,743)	(114,768)
Cash and cash equivalents at beginning of period	138,567	195,737
Cash and cash equivalents at end of period	$ 134,824	$ 80,969