Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011
Operating Activities
Net income	$ 44,853	$ 22,667
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	10,247	10,119
Net gain on the purchase of property and equipment	(8,457)
Amortization of other intangible assets and other assets	11,001	8,570
Stock-based compensation expense	23,796	27,224
Income tax benefit from employee stock-based awards	2,301	2,301
Excess income tax benefit from employee stock-based awards	(2,470)	(2,111)
Deferred income taxes	5,024	2,011
Changes in operating assets and liabilities:
Accounts receivable	(18,470)	(11,581)
Inventories	(5,994)	1,670
Prepaid expenses and other assets	13,283	227
Accounts payable	9,113	871
Accrued expenses	(797)	819
Deferred income on shipments to distributors	5,267	1,495
Income taxes	(4,378)	1,287
Net cash provided by operating activities	84,319	65,569
Investing Activities
Purchases of available-for-sale investments	(138,822)	(113,784)
Proceeds from sales and maturities of marketable securities	209,972	166,262
Purchases of property and equipment	(99,720)	(7,472)
Purchases of other assets	(6,146)	(891)
Acquisition of businesses, net of cash acquired	(71,852)	(27,262)
Net cash provided by (used in) investing activities	(106,568)	16,853
Financing Activities
Proceeds from issuance of common stock, net of shares withheld for taxes	3,035	2,320
Excess income tax benefit from employee stock-based awards	2,470	2,111
Repurchases of common stock	(51,040)	(110,063)
Proceeds from issuance of long-term debt, net	98,325
Payments on debt		(7,174)
Net cash provided by (used in) financing activities	52,790	(112,806)
Increase (decrease) in cash and cash equivalents	30,541	(30,384)
Cash and cash equivalents at beginning of period	94,964	138,567
Cash and cash equivalents at end of period	$ 125,505	$ 108,183