Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 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	36,259us-gaap_NetIncomeLoss	33,070us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	29,433	26,017
Amortization of debt discount and fees	5,945	4,882
Stock-based compensation	21,861us-gaap_ShareBasedCompensation	18,864us-gaap_ShareBasedCompensation
Gain on investments, net	(1,270)us-gaap_GainLossOnInvestments	(3,651)us-gaap_GainLossOnInvestments
Deferred income taxes	1,864us-gaap_DeferredIncomeTaxExpenseBenefit	2,245us-gaap_DeferredIncomeTaxExpenseBenefit
Other non-cash items	929us-gaap_OtherNoncashIncomeExpense	2,344us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effect of acquired businesses:
Receivables	(12,450)	(108)
Inventories	1,682us-gaap_IncreaseDecreaseInInventories	(9,373)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other	(10,004)	(9,753)
Other assets	3,627	3,157
Accounts payable and accrued liabilities	(44,754)	(29,680)
Deferred revenue	16,812	(5,508)
Other long-term liabilities	(3,246)	(4,408)
Net cash provided by operating activities	46,688	28,098
Cash flows from investing activities:
Purchases of available-for-sale securities	(33,161)	(47,005)
Proceeds from the sale of available-for-sale securities	20,551	32,586
Proceeds from the maturity of available-for-sale securities	10,350	13,905
Proceeds from the sale of long-term investments	1,364	0
Purchases of property, plant and equipment	(7,520)	(6,252)
Cash paid in business combinations and asset acquisitions, net of cash acquired	0	(27,422)
Net cash used for investing activities	(8,416)	(34,188)
Cash flows from financing activities:
Payment of convertible notes	(53,862)us-gaap_RepaymentsOfConvertibleDebt	0us-gaap_RepaymentsOfConvertibleDebt
Payment of convertible notes embedded conversion derivative liability	(77,139)	0
Proceeds from convertible notes hedges	77,139	0
Payment of acquisition-related contingent consideration	0	(1,835)
Tax effect related to employee stock transactions allocated to equity	6,482	1,827
Proceeds from issuance of common stock	24,609	23,377
Stock received for payment of employee taxes on vesting of restricted stock	(14,114)	(10,981)
Payments for repurchases of common stock	(36,797)	(12,517)
Net cash used for financing activities	(73,682)	(129)
Effect of exchange rate changes on cash and cash equivalents	(9,015)	2,720
Decrease in cash and cash equivalents	(44,425)	(3,499)
Cash and cash equivalents at end of period	887,736	532,761
Supplemental cash flow information:
Cash paid for interest	125us-gaap_InterestPaid	112us-gaap_InterestPaid
Cash paid for taxes, net	$ 10,868us-gaap_IncomeTaxesPaidNet	$ 5,393us-gaap_IncomeTaxesPaidNet

Cash paid in business combinations and asset acquisitions, net of cash acquired, and acquisitions of intangibles.

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Stock Received for Payment of Employee Taxes on Vesting of Restricted Stock

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Tax Effect Related to Employee Stock Transactions Allocated to Equity Financing Activities.

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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The amount of cash paid for interest during the period.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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- Definition

The cash inflow from the additional capital contribution to the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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- Definition

The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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