Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Sep. 28, 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	93,868	126,538
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	84,296	72,681
Amortization of debt discount and fees	14,863	19,102
Stock-based compensation	60,818	47,487
Gain on investments, net	(3,202)	(4,035)
Deferred income taxes	18,963	(6,425)
Other non-cash items	6,221	2,183
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(1,858)	2,192
Inventories	(15,796)	(10,005)
Prepaid expenses and other	(8)	26,927
Other assets	(38,241)	(46,651)
Accounts payable and accrued liabilities	(15,623)	18,277
Deferred revenue	(27,231)	(5,474)
Other long-term liabilities	7,585	5,644
Net cash provided by operating activities	184,655	248,441
Cash flows from investing activities:
Purchases of available-for-sale securities	(98,392)	(84,000)
Proceeds from the sale of available-for-sale securities	69,912	59,014
Proceeds from the maturity of available-for-sale securities	32,402	30,506
Proceeds from the sale of long-term investments	0	6,200
Purchases of property, plant and equipment	(27,958)	(35,950)
Cash paid in business combinations and asset acquisitions, net of cash acquired	(167,248)	(392,825)
Net cash used for investing activities	(191,284)	(417,055)
Cash flows from financing activities:
Proceeds from revolving credit facility	100,000	100,000
Payment on revolving credit facility	(100,000)	(50,000)
Payment of convertible notes	(1)	(78)
Payment of convertible notes embedded conversion derivative liability	(1)	0
Proceeds from convertible notes hedges	1	0
Principal payments on receivable financing	0	(2,526)
Payment of debt issuance costs	(322)	0
Payment of acquisition-related contingent consideration	(1,835)	(677)
Tax effect related to employee stock transactions allocated to equity	5,786	9,494
Proceeds from issuance of common stock	54,717	40,691
Stock received for payment of employee taxes on vesting of restricted stock	(23,648)	(19,461)
Payments for repurchases of common stock	(62,575)	0
Net cash provided by (used for) financing activities	(27,878)	77,443
Effect of exchange rate changes on cash and cash equivalents	(1,270)	(14,783)
Decrease in cash and cash equivalents	(35,777)	(105,954)
Cash and cash equivalents at end of period	500,483	620,403
Supplemental cash flow information:
Cash paid for interest	5,113	6,538
Cash paid for taxes, net	21,410	5,281
Non-cash investing and financing activities:
Stock options assumed in acquisitions	0	529
Available-for-sale securities received from customer	$ 1,695	$ 232