Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of period	$ 616,686	$ 932,161
Cash flows from operating activities:
Net income	99,897	94,419
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62,759	58,963
Amortization of debt discount and fees	527	8,971
Stock-based compensation	49,988	43,564
Gain on investments, net	(3,265)	(1,590)
Deferred income taxes	10,252	7,097
Other non-cash items	750	1,142
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(3,532)	(8,078)
Inventories	(10,296)	(6,243)
Prepaid expenses and other	(8,690)	(8,036)
Other assets	(8,709)	1,117
Accounts payable and accrued liabilities	(14,012)	(20,653)
Deferred revenue	(7,412)	5,827
Other long-term liabilities	(4,700)	(8,058)
Net cash provided by operating activities	163,557	168,442
Cash flows from investing activities:
Purchases of available-for-sale securities	(20,525)	(59,516)
Proceeds from the sale of available-for-sale securities	55,168	37,586
Proceeds from the maturity of available-for-sale securities	26,115	15,600
Proceeds from the sale of long-term investments	2,583	2,293
Purchases of property, plant and equipment	(28,287)	(24,067)
Cash paid in business combinations and asset acquisitions, net of cash acquired	(41,627)	0
Net cash used for investing activities	(6,573)	(28,104)
Cash flows from financing activities:
Proceeds from term loans	300,000	0
Proceeds from revolving credit facility	50,000	0
Payment of convertible notes	0	(349,999)
Payment of convertible notes embedded conversion derivative liability	0	(530,643)
Proceeds from convertible notes hedges	0	530,643
Payment of debt issuance costs	(622)	0
Excess tax benefits from stock-based compensation,	0	10,097
Proceeds from issuance of common stock	36,296	38,167
Stock received for payment of employee taxes on vesting of restricted stock	(17,490)	(15,814)
Payments for repurchases of common stock	(480,100)	(93,076)
Net cash used for financing activities	(111,916)	(410,625)
Effect of exchange rate changes on cash and cash equivalents	7,819	(14,023)
Increase (decrease) in cash and cash equivalents	52,887	(284,310)
Cash and cash equivalents at end of period	669,573	647,851
Supplemental cash flow information:
Cash paid for interest	9,423	12,006
Cash paid for taxes, net	$ 13,730	$ 16,373