Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Operating Activities
Net income	$ 39,177	$ 44,853
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation of property and equipment	10,050	10,247
Net gain on the purchase of property and equipment		(8,457)
Amortization of other intangible assets and other assets	11,051	11,001
Stock-based compensation expense	22,304	23,796
Income tax benefit (detriment) from employee stock-based awards	(621)	2,301
Excess income tax benefit from employee stock-based awards	(284)	(2,470)
Deferred income taxes	6,790	5,024
Changes in operating assets and liabilities:
Accounts receivable	12,599	(18,470)
Inventories	6,213	(5,994)
Prepaid expenses and other assets	(1,606)	13,283
Accounts payable	(3,017)	9,113
Accrued expenses	(2,864)	(797)
Deferred income on shipments to distributors	(3,169)	5,267
Income taxes	(1,429)	(4,378)
Net cash provided by operating activities	95,194	84,319
Investing Activities
Purchases of available-for-sale investments	(164,317)	(138,822)
Proceeds from sales and maturities of available-for-sale investments	186,936	209,972
Purchases of property and equipment	(8,984)	(99,720)
Purchases of other assets	(3,499)	(6,146)
Acquisition of businesses, net of cash acquired	(86,441)	(71,852)
Net cash used in investing activities	(76,305)	(106,568)
Financing Activities
Proceeds from issuance of common stock, net of shares withheld for taxes	11,900	3,035
Excess income tax benefit from employee stock-based awards	284	2,470
Repurchases of common stock	(7,776)	(51,040)
Proceeds from issuance of long-term debt, net		98,325
Payments on debt	(12,184)
Net cash provided by (used) in financing activities	(7,776)	52,790
Increase in cash and cash equivalents	11,113	30,541
Cash and cash equivalents at beginning of period	105,426	94,964
Cash and cash equivalents at end of period	$ 116,539	$ 125,505