Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2013	Jun. 30, 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	88,038	67,490
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	46,977	43,736
Amortization of debt discount and fees	12,625	11,529
Stock-based compensation	28,921	21,886
Gain on investments, net	(2,477)	(4,169)
Deferred income taxes	(4,413)	459
Other non-cash items	433	3,564
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	8,719	16,513
Inventories	(2,672)	499
Prepaid expenses and other	26,516	414
Other assets	(45,274)	(169)
Accounts payable and accrued liabilities	10,023	(4,694)
Deferred revenue	(24,359)	(27,446)
Other long-term liabilities	7,174	(1,424)
Net cash provided by operating activities	150,231	128,188
Cash flows from investing activities:
Purchases of available-for-sale securities	(63,705)	(49,083)
Proceeds from the sale of available-for-sale securities	46,857	136
Proceeds from the maturity of available-for-sale securities	15,716	0
Proceeds from the sale of long-term investments	6,102	44
Purchases of property, plant and equipment	(23,739)	(18,269)
Investment in venture capital partnerships and equity investments	0	(250)
Cash paid in business combinations and asset acquisitions, net of cash acquired	(392,139)	(1,041)
Net cash used for investing activities	(410,908)	(68,463)
Cash flows from financing activities:
Proceeds from revolving credit facility	100,000	0
Principal payments on receivable financing	(2,526)	(2,907)
Payment of acquisition-related contingent consideration	(582)	(39)
Tax effect related to employee stock transactions allocated to equity	7,300	4,075
Proceeds from issuance of common stock	30,227	13,063
Stock received for payment of employee taxes on vesting of restricted stock	(11,758)	(9,897)
Net cash provided by financing activities	122,661	4,295
Effect of exchange rate changes on cash and cash equivalents	(11,108)	(3,964)
Increase (decrease) in cash and cash equivalents	(149,124)	60,056
Cash and cash equivalents at end of period	577,233	661,658
Supplemental cash flow information:
Interest paid	6,294	5,677
Income taxes paid, including foreign withholding tax	6,598	9,801
Non-cash investing and financing activities:
Stock options assumed for acquisition	529	0
Available-for-sale securities received from customer	$ 232	$ 15