Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of period	$ 726,357	$ 601,602
Cash flows from operating activities:
Net income	126,538	126,074
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	72,681	67,171
Amortization of debt discount and fees	19,102	17,480
Stock-based compensation	47,487	34,285
Gain on investments, net	(4,035)	(2,222)
Deferred income taxes	(6,425)	(14,107)
Other non-cash items	2,183	3,578
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	2,192	24,276
Inventories	(10,005)	6,936
Prepaid expenses and other	26,927	1,547
Other assets	(46,651)	(3,101)
Accounts payable and accrued liabilities	18,277	(1,714)
Deferred revenue	(5,474)	(38,230)
Other long-term liabilities	5,644	(1,855)
Net cash provided by operating activities	248,441	220,118
Cash flows from investing activities:
Purchases of available-for-sale securities	(84,000)	(101,248)
Proceeds from the sale of available-for-sale securities	59,014	5,936
Proceeds from the maturity of available-for-sale securities	30,506	1,500
Proceeds from the sale of long-term investments	6,200	44
Purchases of property, plant and equipment	(35,950)	(25,932)
Investment in venture capital partnerships and equity investments	0	(250)
Cash paid in business combinations and asset acquisitions, net of cash acquired	(392,825)	(66,432)
Net cash used for investing activities	(417,055)	(186,382)
Cash flows from financing activities:
Proceeds from revolving credit facility	100,000	0
Payment on revolving credit facility	(50,000)	0
Payment of convertible notes	(78)	0
Principal payments on receivable financing	(2,526)	(2,907)
Payment of acquisition-related contingent consideration	677	39
Tax effect related to employee stock transactions allocated to equity	9,494	5,790
Proceeds from issuance of common stock	40,691	28,755
Stock received for payment of employee taxes on vesting of restricted stock	(19,461)	(13,457)
Net cash provided by financing activities	77,443	18,142
Effect of exchange rate changes on cash and cash equivalents	14,783	4,381
Increase (decrease) in cash and cash equivalents	(105,954)	47,497
Cash and cash equivalents at end of period	620,403	649,099
Supplemental cash flow information:
Cash paid for interest	6,538	5,677
Cash paid for taxes, net	5,281	12,481
Non-cash investing and financing activities:
Stock options assumed for acquisition	529	0
Available-for-sale securities received from customer	$ 232	$ 20