Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of period	$ 932,161	$ 536,260
Cash flows from operating activities:
Net income	94,419	56,333
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	58,963	53,609
Amortization of debt discount and fees	8,971	9,814
Stock-based compensation	43,564	37,941
Gain on investments, net	(1,590)	(5,128)
Deferred income taxes	7,097	4,778
Other non-cash items	1,142	3,694
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(8,078)	5,336
Inventories	(6,243)	(12,266)
Prepaid expenses and other	(8,036)	(13,602)
Other assets	1,117	(1,273)
Accounts payable and accrued liabilities	(20,653)	(13,550)
Deferred revenue	5,827	(23,740)
Other long-term liabilities	(8,058)	(4,983)
Net cash provided by operating activities	168,442	96,963
Cash flows from investing activities:
Purchases of available-for-sale securities	(59,516)	(77,490)
Proceeds from the sale of available-for-sale securities	37,586	54,601
Proceeds from the maturity of available-for-sale securities	15,600	23,799
Proceeds from the sale of long-term investments	2,293	0
Purchases of property, plant and equipment	(24,067)	(17,715)
Cash paid in business combinations and asset acquisitions, net of cash acquired	0	(163,685)
Net cash used for investing activities	(28,104)	(180,490)
Cash flows from financing activities:
Proceeds from Lines of Credit	0	100,000
Payment of convertible notes	(349,999)	0
Payment of convertible notes embedded conversion derivative liability	(530,643)	0
Proceeds from convertible notes hedges	530,643	0
Payment of acquisition-related contingent consideration	0	(1,835)
Excess tax benefits from stock-based compensation	10,097	2,642
Proceeds from issuance of common stock	38,167	36,482
Stock received for payment of employee taxes on vesting of restricted stock	(15,814)	(12,292)
Payments for repurchases of common stock	(93,076)	(25,032)
Net cash provided by (used for) financing activities	(410,625)	99,965
Effect of exchange rate changes on cash and cash equivalents	(14,023)	4,718
Increase (decrease) in cash and cash equivalents	(284,310)	21,156
Cash and cash equivalents at end of period	647,851	557,416
Supplemental cash flow information:
Cash paid for interest	12,006	4,831
Cash paid for taxes, net	16,373	10,231
Available-for-sale securities received from customer	$ 0	$ 1,695