Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Oct. 03, 2015	Sep. 27, 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	172,043	93,868
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	88,006	84,296
Amortization of debt discount and fees	9,185	14,863
Stock-based compensation	67,681	60,818
Gain on investments, net	(1,434)	(3,202)
Deferred income taxes	1,713	18,963
Other non-cash items	(69)	6,221
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(10,100)	(1,858)
Inventories	(1,861)	(15,796)
Prepaid expenses and other	(12,451)	(8)
Other assets	300	(38,241)
Accounts payable and accrued liabilities	(28,154)	(15,623)
Deferred revenue	(9,207)	(27,231)
Other long-term liabilities	(20,303)	7,585
Net cash provided by operating activities	255,349	184,655
Cash flows from investing activities:
Purchases of available-for-sale securities	(81,300)	(98,392)
Proceeds from the sale of available-for-sale securities	50,806	69,912
Proceeds from the maturity of available-for-sale securities	25,550	32,402
Proceeds from the sale of long-term investments	4,510	0
Purchases of property, plant and equipment	(34,093)	(27,958)
Cash paid in business combinations and asset acquisitions, net of cash acquired	0	(167,248)
Net cash used for investing activities	(34,527)	(191,284)
Cash flows from financing activities:
Proceeds from revolving credit facility	0	100,000
Payment on revolving credit facility	0	(100,000)
Payment of convertible notes	(349,999)	(1)
Payment of convertible notes embedded conversion derivative liability	(530,643)	(1)
Proceeds from convertible notes hedges	530,643	1
Payment of debt issuance costs	0	(322)
Payment of acquisition-related contingent consideration	0	(1,835)
Excess tax benefits from stock-based compensation	16,940	5,786
Proceeds from issuance of common stock	59,448	54,717
Stock received for payment of employee taxes on vesting of restricted stock	(31,795)	(23,648)
Payments for repurchases of common stock	(213,135)	(62,575)
Net cash used for financing activities	(518,541)	(27,878)
Effect of exchange rate changes on cash and cash equivalents	(18,351)	(1,270)
Decrease in cash and cash equivalents	(316,070)	(35,777)
Cash and cash equivalents at end of period	616,091	500,483
Supplemental cash flow information:
Cash paid for interest	12,134	5,113
Cash paid for taxes, net	23,930	21,410
Available-for-sale securities received from customer	$ 0	$ 1,695