Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of period	$ 536,260	$ 726,357
Cash flows from operating activities:
Net income	56,333	88,038
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	53,609	46,977
Amortization of debt discount and fees	9,814	12,625
Stock-based compensation	37,941	28,921
Gain on investments, net	(5,128)	(2,477)
Deferred income taxes	4,778	(4,413)
Other non-cash items	3,694	433
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	5,336	8,719
Inventories	(12,266)	(2,672)
Prepaid expenses and other	(13,602)	26,516
Other assets	(1,273)	(45,274)
Accounts payable and accrued liabilities	(13,550)	10,023
Deferred revenue	(23,740)	(24,359)
Other long-term liabilities	(4,983)	7,174
Net cash provided by operating activities	96,963	150,231
Cash flows from investing activities:
Purchases of available-for-sale securities	(77,490)	(63,705)
Proceeds from the sale of available-for-sale securities	54,601	46,857
Proceeds from the maturity of available-for-sale securities	23,799	15,716
Proceeds from the sale of long-term investments	0	6,102
Purchases of property, plant and equipment	(17,715)	(23,739)
Cash paid in business combinations and asset acquisitions, net of cash acquired	(163,685)	(392,139)
Net cash used for investing activities	(180,490)	(410,908)
Cash flows from financing activities:
Proceeds from revolving line of credit	100,000	100,000
Principal payments on receivable financing	0	(2,526)
Payment of acquisition-related contingent consideration	(1,835)	(582)
Tax effect related to employee stock transactions allocated to equity	2,642	7,300
Proceeds from issuance of common stock	36,482	30,227
Stock received for payment of employee taxes on vesting of restricted stock	(12,292)	(11,758)
Payments for repurchases of common stock	(25,032)	0
Net cash provided by financing activities	99,965	122,661
Effect of exchange rate changes on cash and cash equivalents	4,718	(11,108)
Increase (decrease) in cash and cash equivalents	21,156	(149,124)
Cash and cash equivalents at end of period	557,416	577,233
Supplemental cash flow information:
Cash paid for interest	4,831	6,294
Cash paid for taxes, net	10,231	6,598
Non-cash investing and financing activities:
Stock options assumed in acquisitions	0	529
Available-for-sale securities received from customer	$ 1,695	$ 232