CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Cash flows from operating activities:
Net income	$ 92,708	$ 87,914
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	23,312	18,906
Share-based compensation	9,372	11,485
Asset impairment charge	0	9,114
Excess tax benefit from share-based compensation	(4,170)	(1,492)
Loss on sale of property and equipment	172	178
Gain on sale of business	0	(613)
Deferred income taxes	4,888	2,755
Changes in assets and liabilities:
Accounts receivable, net	(6,641)	(6,108)
Inventories, net	16,702	11,981
Other assets	2,257	12,070
Accounts payable	(445)	(10,843)
Accrued liabilities	(6,256)	(11,341)
Deferred revenue	1,752	2,644
Income taxes	3,040	14,711
Other operating activities	298	(6,378)
Net cash provided by operating activities	136,989	134,983
Cash flows from investing activities:
Purchases of property and equipment	(13,522)	(17,140)
Proceeds from the sale of business	0	27,580
Acquisition of business, net of cash acquired	0	(59,874)
Acquisition of intangible assets	(1,500)	(3,000)
Purchase of long-term equity investment	(1,708)	(5,000)
Purchases of investments and marketable securities	(338,227)	(483,349)
Maturities of investments and marketable securities	41,021	324,139
Proceeds from sales of investments and marketable securities	223,905	133,863
Net cash used in investing activities	(90,031)	(82,781)
Cash flows from financing activities:
Purchase of treasury stock	(58,459)	(39,697)
Proceeds from exercise of stock options and stock purchase plan purchases	6,470	1,909
Excess tax benefit from share-based compensation	4,170	1,492
Net cash used in financing activities	(47,819)	(36,296)
Effect of exchange rate changes on cash	317	(71)
Net increase (decrease) in cash and cash equivalents	(544)	15,835
Cash and cash equivalents at beginning of period	64,740	36,418
Cash and cash equivalents at end of period	64,196	52,253
Supplemental disclosures of cash flow information:
Income taxes paid	$ 10,951	$ 16,773