Citrix Systems (CTXS) 10-Q5 Nov 132013 Q3 Quarterly reportFinancial data

Company Profile

Document_And_Entity_Informatio

Document And Entity Information	9 Months Ended
Document And Entity Information	Sep. 30, 2013	Oct. 31, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'CTXS	'
Entity Registrant Name	'CITRIX SYSTEMS INC	'
Entity Central Index Key	'0000877890	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	186,397,081

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:	'	'
Cash and cash equivalents	$246,473	$643,609
Short-term investments, available-for-sale	448,196	285,022
Accounts receivable, net of allowances of $5,371 and $6,448 at September 30, 2013 and December 31, 2012, respectively	450,395	630,956
Inventories, net	11,979	10,723
Prepaid expenses and other current assets	131,927	106,579
Current portion of deferred tax assets, net	39,836	36,846
Total current assets	1,328,806	1,713,735
Long-term investments, available-for-sale	961,422	595,313
Property and equipment, net	337,021	303,294
Goodwill	1,766,902	1,518,219
Other intangible assets, net	533,996	556,205
Long-term portion of deferred tax assets, net	129,983	43,097
Other assets	65,859	66,539
Total assets	5,123,989	4,796,402
Current liabilities:	'	'
Accounts payable	68,646	71,116
Accrued expenses and other current liabilities	244,387	257,135
Income taxes payable	25,472	49,346
Current portion of deferred revenues	1,002,090	965,276
Total current liabilities	1,340,595	1,342,873
Long-term portion of deferred revenues	268,086	232,719
Other liabilities	114,508	99,033
Commitments and contingencies	'	'
Stockholders' equity:	'	'
Preferred stock at $.01 par value: 5,000 shares authorized, none issued and outstanding	0	0
Common stock at $.001 par value: 1,000,000 shares authorized; 290,639 and 287,123 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	291	287
Additional paid-in capital	3,948,810	3,691,111
Retained earnings	2,764,897	2,564,018
Accumulated other comprehensive loss	-3,222	-7,705
Stockholders' equity before treasury stock	6,710,776	6,247,711
Less - common stock in treasury, at cost (103,410 and 100,781 shares at September 30, 2013 and December 31, 2012, respectively)	-3,309,976	-3,125,934
Total stockholders' equity	3,400,800	3,121,777
Total liabilities and equity	$5,123,989	$4,796,402

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts receivable, allowance	$5,371	$6,448
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	290,639,000	287,123,000
Common stock, shares outstanding	290,639,000	287,123,000
Common stock in treasury, shares	103,410,000	100,781,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements Of Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:	'	'	'	'
Product and licenses	$201,443	$195,690	$621,741	$561,971
Software as a service	148,179	129,659	429,603	375,902
License updates and maintenance	329,384	285,051	968,017	822,113
Professional services	33,725	31,022	96,653	86,141
Total net revenues	712,731	641,422	2,116,014	1,846,127
Cost of net revenues:	'	'	'	'
Cost of product and license revenues	26,971	24,218	84,465	63,876
Cost of services and maintenance revenues	72,632	58,920	208,241	166,328
Amortization of product related intangible assets	24,330	22,930	73,381	56,565
Total cost of net revenues	123,933	106,068	366,087	286,769
Gross margin	588,798	535,354	1,749,927	1,559,358
Operating expenses:	'	'	'	'
Research and development	127,049	114,713	389,840	328,363
Sales, marketing and services	300,416	263,136	915,194	773,732
General and administrative	63,580	65,252	193,708	186,407
Amortization of other intangible assets	10,386	9,838	31,322	25,499
Total operating expenses	501,431	452,939	1,530,064	1,314,001
Income from operations	87,367	82,415	219,863	245,357
Interest income	2,079	2,059	6,062	7,965
Other income (expense), net	1,359	6,424	-53	7,671
Income before income taxes	90,805	90,898	225,872	260,993
Income tax expense	14,075	12,653	24,993	22,475
Net income	$76,730	$78,245	$200,879	$238,518
Earnings per share:	'	'	'	'
Basic (in dollars per share)	$0.41	$0.42	$1.07	$1.28
Diluted (in dollars per share)	$0.41	$0.41	$1.06	$1.26
Weighted average shares outstanding:	'	'	'	'
Basic (in shares)	187,459	186,864	187,120	186,326
Diluted (in shares)	188,980	189,671	188,830	189,282

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$76,730	$78,245	$200,879	$238,518
Other comprehensive income:	'	'	'	'
Change in foreign currency translation adjustment	6,928	5,414	4,099	-4,436
Available for sale securities:	'	'	'	'
Change in net unrealized gains	1,623	-1,037	-1,470	1,420
Less: reclassification adjustment for net losses (gains) included in net income	44	2,579	13	-283
Net change (net of tax effect)	1,667	1,542	-1,457	1,137
Loss on pension liability	0	0	-334	0
Cash flow hedges:	'	'	'	'
Change in unrealized gains	3,896	2,235	-1,399	-109
Less: reclassification adjustment for net losses included in net income	1,262	2,530	3,574	4,836
Net change (net of tax effect)	5,158	4,765	2,175	4,727
Other comprehensive income	13,753	11,721	4,483	1,428
Comprehensive income	$90,483	$89,966	$205,362	$239,946

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012
Operating Activities	'		'
Net income	$200,879		$238,518
Adjustments to reconcile net income to net cash provided by operating activities:	'		'
Amortization of intangible assets	104,703	[1]	82,064	[1]
Depreciation and amortization of property and equipment	93,939		71,991
Stock-based compensation expense	137,306		108,922
Gain on investments	-2,298		-13,378
Provision for doubtful accounts	1,267		829
Provision for product returns	3,471		8,703
Provision for inventory reserves	1,529		923
Tax effect of stock-based compensation	24,421		30,380
Excess tax benefit from exercise of stock options	-33,605		-31,976
Deferred income tax benefit	-50,538		-32,023
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	3,181		-882
Other non-cash items	374		981
Total adjustments to reconcile net income to net cash provided by operating activities	283,750		226,534
Changes in operating assets and liabilities, net of the effects of acquisitions:	'		'
Accounts receivable	182,039		70,485
Inventories	-3,088		-2,163
Prepaid expenses and other current assets	-21,663		-27,114
Other assets	4,841		2,392
Income taxes, net	-44,570		-4,393
Accounts payable	-4,949		-7,051
Accrued expenses and other current liabilities	10,783		22,051
Deferred revenues	59,891		72,816
Other liabilities	13,416		-269
Total changes in operating assets and liabilities, net of the effects of acquisitions	196,700		126,754
Net cash provided by operating activities	681,329		591,806
Investing Activities	'		'
Purchases of available-for-sale investments	-1,427,698		-1,189,868
Proceeds from sales of available-for-sale investments	486,822		891,008
Proceeds from maturities of available-for-sale investments	409,556		356,893
Purchases of property and equipment	-126,610		-87,290
Proceeds from the sales of cost method investments	2,811		21,413
Purchases of cost method investments	-5,095		-5,149
Cash paid for acquisitions, net of cash acquired	-329,343		-488,347
Cash paid for licensing agreements and product related intangible assets	-7,202		-14,277
Other	0		3,450
Net cash used in investing activities	-996,759		-512,167
Financing Activities	'		'
Proceeds from issuance of common stock under stock-based compensation plans	68,570		95,796
Repayment of acquired debt	0		-24,346
Excess tax benefit from exercise of stock options	33,605		31,976
Stock repurchases, net	-156,334		-174,951
Cash paid for tax withholding on vested stock awards	-27,708		-17,524
Other	912		1,050
Net cash used in financing activities	-80,955		-87,999
Effect of exchange rate changes on cash and cash equivalents	-751		-809
Change in cash and cash equivalents	-397,136		-9,169
Cash and cash equivalents at beginning of period	643,609		333,296
Cash and cash equivalents at end of period	$246,473		$324,127

[1]	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

Basis_Of_Presentation

Basis Of Presentation	9 Months Ended
Basis Of Presentation	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
BASIS OF PRESENTATION	'
	1. BASIS OF PRESENTATION
	The accompanying unaudited condensed consolidated financial statements of Citrix Systems, Inc. (the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States for complete financial statements. All adjustments, which, in the opinion of management, are considered necessary for a fair presentation of the results of operations for the periods shown, are of a normal recurring nature and have been reflected in the condensed consolidated financial statements and accompanying notes. The results of operations for the periods presented are not necessarily indicative of the results expected for the full year or for any future period partially because of the seasonality of the Company’s business. Historically, the Company’s revenue for the fourth quarter of any year is typically higher than the revenue for the first quarter of the subsequent year. The information included in these condensed consolidated financial statements should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in this report and the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.
	The condensed consolidated financial statements of the Company include the accounts of its wholly-owned subsidiaries in the Americas, Europe, the Middle East and Africa (“EMEA”), and Asia-Pacific. All significant transactions and balances between the Company and its subsidiaries have been eliminated in consolidation.
	The Company’s revenues are derived from its Infrastructure products, which primarily include its Mobile and Desktop products, Networking and Cloud products and related license updates and maintenance and professional services and from its SaaS products, which primarily include Collaboration and Data Sharing, Remote Access and Remote IT Support products. Infrastructure (formerly Enterprise division) and SaaS (formerly Online Services division) constitute the Company's two reportable segments. See Note 9 for more information on the Company's segments.

Significant_Accounting_Policie

Significant Accounting Policies	9 Months Ended
Significant Accounting Policies	Sep. 30, 2013
Accounting Policies [Abstract]	'
SIGNIFICANT ACCOUNTING POLICIES	'
	2. SIGNIFICANT ACCOUNTING POLICIES
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Significant estimates made by management include the provision for doubtful accounts receivable, the provision to reduce obsolete or excess inventory to market, the provision for estimated returns, as well as sales allowances, the assumptions used in the valuation of stock-based awards, the assumptions used in the discounted cash flows to mark certain of its investments to market, the valuation of the Company’s goodwill, net realizable value of product related and other intangible assets, the provision for income taxes and the amortization and depreciation periods for intangible and long-lived assets. While the Company believes that such estimates are fair when considered in conjunction with the condensed consolidated financial position and results of operations taken as a whole, the actual amounts of such items, when known, will vary from these estimates.
	Investments
	Short-term and long-term investments as of September 30, 2013 and December 31, 2012 primarily consist of agency securities, corporate securities, municipal securities and government securities. Investments classified as available-for-sale are stated at fair value with unrealized gains and losses, net of taxes, reported in Accumulated other comprehensive loss. The Company classifies its available-for-sale investments as current and non-current based on their actual remaining time to maturity. The Company does not recognize changes in the fair value of its available-for-sale investments in income unless a decline in value is considered other-than-temporary in accordance with the authoritative guidance.
	The Company’s investment policy is designed to limit exposure to any one issuer depending on credit quality. The Company uses information provided by third parties to adjust the carrying value of certain of its investments to fair value at the end of each period. Fair values are based on a variety of inputs and may include interest rates, known historical trades, yield curve information, benchmark data, prepayment speeds, credit quality and broker/dealer quotes.
	Inventory
	Inventories are stated at the lower of cost or market on a standard cost basis, which approximates actual cost. The Company’s inventories as of September 30, 2013 and December 31, 2012 primarily consist of finished goods.
	Revenue Recognition
	Net revenues include the following categories: Product and licenses, Software as a service ("SaaS"), License updates and maintenance and Professional services. Product and licenses revenues primarily represent fees related to the licensing of the Company’s software and hardware appliance products. These revenues are reflected net of sales allowances, cooperative advertising agreements, partner incentive programs and provisions for returns. Shipping charges billed to customers are included in Product and license revenue and the related shipping costs are included in Cost of product and license revenue. SaaS revenues consist primarily of fees related to online service agreements, which are recognized ratably over the contract term, which is typically 12 months. In addition, SaaS revenues may also include set-up fees, which are recognized ratably over the contract term or the expected customer life, whichever is longer. License updates and maintenance revenues consist of fees related to the Subscription Advantage program and maintenance fees, which include technical support and hardware and software maintenance. The Company licenses many of its virtualization products bundled with a one-year contract for its Subscription Advantage program. Subscription Advantage is a renewable program that provides subscribers with immediate access to software upgrades, enhancements and maintenance releases when and if they become available during the term of the contract. Subscription Advantage and maintenance fees are recognized ratably over the term of the contract, which is typically 12 to 24 months. The Company capitalizes certain third-party commissions related to Subscription Advantage renewals. The capitalized commissions are amortized to Sales, marketing and services expense at the time the related deferred revenue is recognized as revenue. Hardware and software maintenance and support contracts are typically sold separately. Hardware maintenance includes technical support, the latest software upgrades and replacement of malfunctioning appliances. Dedicated account management is available as an add-on to the program for a higher level of service. Software maintenance includes unlimited support with product version upgrades. Professional services revenues are comprised of fees from consulting services related to the implementation of the Company’s products and fees from product training and certification, which are recognized as the services are provided.
	The Company recognizes revenue when it is earned and when all of the following criteria are met: persuasive evidence of the arrangement exists; delivery has occurred or the service has been provided and the Company has no remaining obligations; the fee is fixed or determinable; and collectability is probable.
	The majority of the Company’s product and license revenue consists of revenue from the sale of stand-alone software products. Stand-alone software sales generally include a perpetual license to the Company’s software and is subject to the industry specific software revenue recognition guidance. In accordance with this guidance, the Company allocates revenue to license updates related to its stand-alone software and any other undelivered elements of the arrangement based on vendor specific objective evidence (“VSOE”) of fair value of each element and such amounts are deferred until the applicable delivery criteria and other revenue recognition criteria described above have been met. The balance of the revenues, net of any discounts inherent in the arrangement, is recognized at the outset of the arrangement using the residual method as the product licenses are delivered. If management cannot objectively determine the fair value of each undelivered element based on VSOE of fair value, revenue recognition is deferred until all elements are delivered, all services have been performed, or until fair value can be objectively determined.
	For hardware appliance transactions, the arrangement consideration is allocated to stand-alone software deliverables as a group and the non-software deliverables based on the relative selling prices using the selling price hierarchy in the amended revenue recognition guidance. The selling price hierarchy for a deliverable is based on its VSOE if available, third-party evidence of selling price ("TPE") if VSOE is not available, or estimated selling price ("ESP") if neither VSOE nor TPE is available. The Company then recognizes revenue on each deliverable in accordance with its policies for product and service revenue recognition. VSOE of selling price is based on the price charged when the element is sold separately. In determining VSOE, the Company requires that a substantial majority of the selling prices fall within a reasonable range based on historical discounting trends for specific products and services. TPE of selling price is established by evaluating competitor products or services in stand-alone sales to similarly situated customers. However, as the Company’s products contain a significant element of proprietary technology and its solutions offer substantially different features and functionality, the comparable pricing of products with similar functionality typically cannot be obtained. Additionally, as the Company is unable to reliably determine what competitors products’ selling prices are on a stand-alone basis, the Company is not typically able to determine TPE. The estimate of selling price is established considering multiple factors including, but not limited to, pricing practices in different geographies and through different sales channels and competitor pricing strategies.
	For the Company’s non-software deliverables, it allocates the arrangement consideration based on the relative selling price of the deliverables. For the Company’s hardware appliances, it uses ESP as its selling price. For the Company’s support and services, it generally uses VSOE as its selling price. When the Company is unable to establish selling price using VSOE for its support and services, the Company uses ESP in its allocation of arrangement consideration.
	The Company’s SaaS products are considered service arrangements per the authoritative guidance; accordingly, the Company follows the provisions of Securities and Exchange Commission Staff Accounting Bulletin (“SAB”) No. 104, Revenue Recognition, when accounting for these service arrangements. Generally, the Company’s SaaS products are sold separately and not bundled with the Company's Infrastructure products and services.
	In the normal course of business, the Company is not obligated to accept product returns from its distributors under any conditions, unless the product item is defective in manufacture. The Company establishes provisions for estimated returns, as well as other sales allowances, concurrently with the recognition of revenue. The provisions are established based upon consideration of a variety of factors, including, among other things, recent and historical return rates for both specific products and distributors and the impact of any new product releases and projected economic conditions. Product returns are provided for in the condensed consolidated financial statements and have historically been within management’s expectations. Allowances for estimated product returns amounted to approximately $1.6 million and $2.6 million at September 30, 2013 and December 31, 2012, respectively. The Company also records estimated reductions to revenue for customer programs and incentive offerings, including volume-based incentives. The Company could take actions to increase its customer incentive offerings, which could result in an incremental reduction to revenue at the time the incentive is offered.
	Foreign Currency
	The functional currency for all of the Company’s wholly-owned foreign subsidiaries in its Infrastructure segment is the U.S. dollar. Monetary assets and liabilities of such subsidiaries are remeasured into U.S. dollars at exchange rates in effect at the balance sheet date, and revenues and expenses are remeasured at average rates prevailing during the year. The functional currency of the Company’s wholly-owned foreign subsidiaries of its SaaS segment is the currency of the country in which each subsidiary is located. The Company translates assets and liabilities of these foreign subsidiaries at exchange rates in effect at the balance sheet date. The Company includes accumulated net translation adjustments in equity as a component of Accumulated other comprehensive loss. Foreign currency transaction gains and losses are the result of exchange rate changes on transactions denominated in currencies other than the functional currency, including U.S. dollars. The remeasurement of those foreign currency transactions is included in determining net income or loss for the period of exchange. See Note 9 for information on the Company's Infrastructure and SaaS segments.
	Accounting for Stock-Based Compensation Plans
	The Company has various stock-based compensation plans for its employees and outside directors and accounts for stock-based compensation arrangements in accordance with the authoritative guidance, which requires the Company to measure and record compensation expense in its condensed consolidated financial statements using a fair value method. See Note 7 for further information regarding the Company’s stock-based compensation plans.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
EARNINGS PER SHARE	'
	3. EARNINGS PER SHARE
	Basic earnings per share is calculated by dividing income available to stockholders by the weighted-average number of common shares outstanding during each period. Diluted earnings per share is computed using the weighted-average number of common and dilutive common share equivalents outstanding during the period. Dilutive common share equivalents consist of shares issuable upon the exercise or settlement of stock awards (calculated using the treasury stock method) during the period they were outstanding.
	The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share information):


		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Numerator:
	Net income	$	76,730	$	78,245	$	200,879	$	238,518

	Denominator:
	Denominator for basic earnings per share - weighted-average shares outstanding	187,459		186,864		187,120		186,326

	Effect of dilutive employee stock awards	1,521		2,807		1,710		2,956

	Denominator for diluted earnings per share - weighted-average shares outstanding	188,980		189,671		188,830		189,282

	Basic earnings per share	$	0.41	$	0.42	$	1.07	$	1.28

	Diluted earnings per share	$	0.41	$	0.41	$	1.06	$	1.26

	Anti-dilutive weighted-average shares	3,286		3,355		3,851		3,336

Acquisitions

Acquisitions	9 Months Ended
Acquisitions	Sep. 30, 2013
Business Combination, Description [Abstract]	'
ACQUISITIONS	'
	4. ACQUISITIONS
	2013 Acquisitions
	Zenprise
	In January 2013, the Company acquired all of the issued and outstanding securities of Zenprise, Inc. ("Zenprise"), a
	privately-held leader in mobile device management. Zenprise became part of the Company's Infrastructure segment, in which Citrix has integrated the Zenprise offering for mobile device management into its XenMobile Enterprise edition. The total consideration for this transaction was approximately $324.0 million, net of $2.9 million of cash acquired, and was paid in cash. Transaction costs associated with the acquisition were approximately $0.6 million, of which the Company expensed approximately $0.1 million during the nine months ended September 30, 2013 and are included in General and administrative expense in the accompanying condensed consolidated statements of income. In addition, in connection with the acquisition, the Company assumed certain stock options, which are exercisable for 285,817 shares of the Company's common stock, for which the vesting period reset fully upon the closing of the transaction.
	Purchase Accounting for the Zenprise acquisition
	The purchase price for Zenprise was allocated to the acquired net tangible and intangible assets based on its estimated fair value as of the date of the acquisition. The allocation of the total purchase price is summarized below (in thousands):


		Zenprise
		Purchase Price Allocation				Asset Life
	Current assets	$	10,943
	Current assets	$	10,943
	Other assets	668
	Other assets	668
	Property and equipment	431				Various
	Property and equipment	431				Various
	Deferred tax assets, non-current	35,656
	Deferred tax assets, non-current	35,656
	Intangible assets	69,200				1-7 years
	Intangible assets	69,200				1-7 years
	Goodwill	249,392				Indefinite
	Goodwill	249,392				Indefinite
	Assets acquired	366,290
	Assets acquired	366,290
	Current liabilities assumed	(8,475		)
	Long-term liabilities assumed	(3,107		)
	Deferred tax liabilities, non-current	(27,714		)
	Net assets acquired	$	326,994
	Net assets acquired	$	326,994
	Current assets acquired in connection with the Zenprise acquisition consisted primarily of cash and accounts receivable. Current liabilities assumed in connection with the Zenprise acquisition consisted primarily of current portion of deferred revenues, short-term payables and other accrued expenses. Long-term liabilities assumed in connection with the Zenprise acquisition consisted of other long-term liabilities and long-term portion of deferred revenues.
	The Company continues to evaluate certain income tax assets and liabilities related to the Zenprise acquisition. Goodwill from the Zenprise acquisition was assigned to the Company's Infrastructure segment. The goodwill related to the Zenprise acquisition is not deductible for tax purposes. See Note 9 for segment information. The goodwill amounts are comprised primarily of expected synergies from combining operations and other intangible assets that do not qualify for separate recognition.
	Revenues from the Zenprise acquisition are included in the revenue of the Company's Infrastructure segment. The Company has included the effect of the Zenprise acquisition in its results of operations prospectively from the date of acquisition.
	Identifiable intangible assets acquired in connection with the Zenprise acquisition (in thousands) and the weighted-average lives are as follows:


		Zenprise				Asset Life
	Trade names	$	2,400			3.0 years
	Trade names	$	2,400			3.0 years
	Non-compete agreements	700				1.0 year
	Non-compete agreements	700				1.0 year
	Customer relationships	18,300				7.0 years
	Customer relationships	18,300				7.0 years
	Core and product technologies	47,800				6.0 years
	Core and product technologies	47,800				6.0 years
	Total	$	69,200
	Total	$	69,200
	2013 Other Acquisition
	In September 2013, the Company acquired all of the issued and outstanding securities of a privately-held company. The total cash consideration for this transaction was approximately $5.3 million. The Company will pay contingent consideration of up to $3.0 million in cash upon the satisfaction of certain milestone achievements, as defined pursuant to the share purchase agreement. This business became part of the Company's SaaS segment. Transaction costs associated with the acquisition were approximately $0.2 million during the three and nine months ended September 30, 2013, and are included in General and administrative expense in the accompanying condensed consolidated statements of income.
	The following pro-forma information combines the consolidated results of the operations of the Company and Zenprise and the 2013 Other Acquisition as if the acquisitions had occurred at the beginning of fiscal year 2012 (in thousands, except per share data):


		Three Months Ended September 30,						Nine Months Ended September 30,
		2013				2012		2013		2012
	Revenues	$	713,082			$	644,121	$	2,116,998	$	1,851,618
	Revenues	$	713,082			$	644,121	$	2,116,998	$	1,851,618
	Income from operations	87,173				69,483		218,735		208,150
	Income from operations	87,173				69,483		218,735		208,150
	Net income	76,364				70,039		199,350		214,784
	Net income	76,364				70,039		199,350		214,784
	Per share - basic	0.41				0.37		1.07		1.15
	Per share - basic	0.41				0.37		1.07		1.15
	Per share - diluted	0.4				0.37		1.06		1.13
	Per share - diluted	0.4				0.37		1.06		1.13
2012 Acquisitions
Bytemobile
In July 2012, the Company acquired all of the issued and outstanding securities of Bytemobile, Inc. (“Bytemobile”), a privately-held provider of data and video optimization solutions for mobile network operators. Bytemobile became part of the Company's Infrastructure segment and extends the Company's industry reach into the mobile and cloud markets. The total consideration for this transaction was approximately $399.5 million, net of $5.6 million of cash acquired, and was paid in cash. Transaction costs associated with the acquisition were approximately $2.1 million, all of which the Company expensed during the nine months ended September 30, 2012 and are included in General and administrative expense in the accompanying condensed consolidated statements of income. Revenues from the Bytemobile acquisition are included in the revenue of the Company's Infrastructure segment. The Company has included the effect of the Bytemobile acquisition in its results of operations prospectively from the date of acquisition.
Purchase Accounting for the Bytemobile acquisition
During the three and nine months ended September 30, 2013, the Company made net adjustments to goodwill of approximately $2.7 million and $4.1 million, respectively, to the purchase price allocation associated with the Bytemobile acquisition. Goodwill from the Bytemobile acquisition was assigned to the Company's Infrastructure segment. The goodwill related to the Bytemobile acquisition is not deductible for tax purposes. See Note 8 for information on adjustments to goodwill and Note 9 for segment information. The goodwill amounts are comprised primarily of expected synergies from combining operations and other intangible assets that do not qualify for separate recognition.
The purchase price for Bytemobile was allocated to the acquired net tangible and intangible assets based on its estimated fair value as of the date of the acquisition. The allocation of the total purchase price is summarized below (in thousands):


	Bytemobile
	Purchase Price Allocation				Asset Life
Current assets	$	57,796
Current assets	$	57,796
Other assets	7,406
Other assets	7,406
Property and equipment	2,484				Various
Property and equipment	2,484				Various
Deferred tax assets, non-current	45,598
Deferred tax assets, non-current	45,598
Intangible assets	248,900				1-9 years
Intangible assets	248,900				1-9 years
Goodwill	221,251				Indefinite
Goodwill	221,251				Indefinite
Assets acquired	583,435
Assets acquired	583,435
Current liabilities assumed	(62,313		)
Long-term liabilities assumed	(4,083		)
Deferred tax liabilities, non-current	(111,905		)
Net assets acquired	$	405,134
Net assets acquired	$	405,134
Current assets acquired in connection with the Bytemobile acquisition consisted primarily of cash and accounts receivable. Current liabilities assumed in connection with the Bytemobile acquisition consisted primarily of current portion of deferred revenues, short-term payables, other accrued expenses and short-term debt which was paid in full subsequent to the acquisition date. Long-term liabilities assumed in connection with the Bytemobile acquisition consisted of other long-term liabilities, long-term portion of deferred revenues and long-term debt, which was paid in full subsequent to the acquisition date. Identifiable intangible assets acquired in connection with the Bytemobile acquisition included trade names of $6.0 million with a weighted-average asset life of 6.0 years, customer relationships of $141.5 million with a weighted-average life of 9.0 years, and core and product technologies of $101.4 million with a weighted-average life of 4.8 years.
Podio
In April 2012, the Company acquired all of the issued and outstanding securities of Podio ApS (“Podio”), a privately-held provider of a cloud-based collaborative work platform. Podio became part of the Company's SaaS segment and expands the Company's offerings of integrated cloud-based support for team-based collaboration. The total consideration for this transaction was approximately $43.6 million, net of $1.7 million of cash acquired, and was paid in cash. Transaction costs associated with the acquisition were approximately $0.5 million, all of which were expensed during the nine months ended September 30, 2012 and are included in General and administrative expense in the accompanying condensed consolidated statements of income. The Company recorded approximately $24.5 million of goodwill, which is not deductible for tax purposes, and acquired $24.6 million of identifiable intangible assets, of which $20.7 million is related to product related intangible assets and $3.9 million is related to other intangible assets. In addition, in connection with the acquisition, the Company assumed non-vested stock units which were converted into the right to receive up to 127,668 shares of the Company's common stock, for which the vesting period reset fully upon the closing of the transaction.
2012 Other Acquisitions
During the first quarter of 2012, the Company acquired all of the issued and outstanding securities of a privately-held company for total cash consideration of approximately $24.6 million, net of $0.6 million of cash acquired. This business became part of the Company’s Infrastructure segment. Transaction costs associated with the acquisition were approximately $0.5 million, of which the Company expensed approximately $0.4 million during the nine months ended September 30, 2012 and are included in General and administrative expense in the accompanying condensed consolidated statements of income. The Company recorded approximately $23.1 million of goodwill, which is not deductible for tax purposes, and acquired $11.0 million of identifiable intangible assets, all of which is related to product related intangible assets. In addition, in connection with this acquisition, the Company assumed non-vested stock units which were converted into the right to receive up to 13,481 shares of the Company's common stock and assumed certain stock options which are exercisable for 12,017 shares of the Company's common stock, for which the vesting period reset fully upon the closing of the transaction.
During the second quarter of 2012, the Company acquired all of the issued and outstanding securities of two privately-held companies for a total cash consideration of approximately $15.4 million, net of $0.2 million of cash acquired. The businesses became part of the Company's Infrastructure segment. Transaction costs associated with the acquisitions were approximately $0.4 million, all of which the Company expensed during the nine months ended September 30, 2012 and are included in General and administrative expense in the accompanying condensed consolidated statements of income. In addition, in connection with the acquisitions, the Company assumed non-vested stock units which were converted into the right to receive, in the aggregate, up to 66,459 shares of the Company's common stock, for which the vesting period reset fully upon the closing of each respective transaction.
During the third quarter of 2012, the Company acquired all of the issued and outstanding securities of two privately-held companies for a total cash consideration of approximately $5.3 million. One of the businesses became part of the Company's Infrastructure segment and the other became part of the Company's SaaS segment. Transaction costs associated with the acquisitions were approximately $0.2 million. In addition, in connection with the acquisitions, the Company assumed non-vested stock units which were converted into the right to receive, in the aggregate, up to 13,487 shares of the Company's common stock, for which the vesting period reset fully upon the closing of each respective transaction.

Investments

Investments	9 Months Ended
	Sep. 30, 2013
Investments [Abstract]	'
INVESTMENTS	'
	5. INVESTMENTS
	Available-for-sale Investments
	Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands):



		September 30, 2013									December 31, 2012
	Description of the	Amortized		Gross		Gross			Fair Value		Amortized		Gross		Gross			Fair Value
	Securities	Cost		Unrealized		Unrealized					Cost		Unrealized		Unrealized
				Gains		Losses							Gains		Losses
	Agency securities	$	527,430	$	1,440	$	(442	)	$	528,428	$	400,365	$	2,347	$	(5	)	$	402,707

	Corporate securities	679,443		785		(505		)	679,723		404,546		947		(171		)	405,322

	Municipal securities	72,951		65		(57		)	72,959		32,214		114		(15		)	32,313

	Government securities	128,220		295		(7		)	128,508		39,863		131		(1		)	39,993

	Total	$	1,408,044	$	2,585	$	(1,011	)	$	1,409,618	$	876,988	$	3,539	$	(192	)	$	880,335

	The change in net unrealized gains (losses) on available-for-sale securities recorded in Other comprehensive income includes unrealized gains (losses) that arose from changes in market value of specifically identified securities that were held during the period, gains (losses) that were previously unrealized, but have been recognized in current period net income due to sales, as well as prepayments of available-for-sale investments purchased at a premium. This reclassification out of Accumulated other comprehensive loss into current period net income has no effect on total comprehensive income or equity and was immaterial for all periods presented. See Note 11 for more information related to comprehensive income.
	For the three and nine months ended September 30, 2013, the Company received proceeds from the sales of available-for-sale investments of $111.5 million and $486.8 million, respectively. For the three and nine months ended September 30, 2012, the Company received proceeds from the sales of available-for-sale investments of $188.3 million and $891.0 million, respectively. The Company had realized gains on the sales of available-for-sale investments during the three and nine months ended September 30, 2013 of $0.1 million and $0.5 million, respectively. The Company had no realized gains on the sales of available-for-sale investments during the three months ended September 30, 2012. The Company had realized gains of $3.5 million on the sales of available-for-sale investments during the nine months ended September 30, 2012.
	For the three and nine months ended September 30, 2013, the Company had realized losses on available-for-sale investments of $0.1 million and $0.4 million, respectively, primarily related to prepayments at par of securities purchased at a premium. For the three and nine months ended September 30, 2012, the Company had realized losses on available-for-sale investments of $0.2 million and $0.8 million, respectively, primarily related to prepayments at par of securities purchased at a premium.
	All realized gains and losses related to the sales of available-for-sale investments are included in Other income (expense), net, in the accompanying condensed consolidated statements of income.
	The average remaining maturities of the Company’s short-term and long-term available-for-sale investments at September 30, 2013 were approximately six months and three years, respectively.
	Other-Than-Temporary Impairment on Available-for-Sale Investments
	During the third quarter of 2012, one of the Company’s available-for-sale investments with a carrying amount of $5.0 million was determined to be other-than-temporarily impaired. As a result of this determination, the investment was written down to its fair value of $2.5 million, resulting in an impairment charge of $2.5 million. The impairment charge is included in Other income (expense), net in the accompanying condensed consolidated statements of income. See Note 6 for more information.
	Unrealized Losses on Available-for-Sale Investments
	The gross unrealized losses on the Company’s available-for-sale investments that are not deemed to be other-than-temporarily impaired as of September 30, 2013 and December 31, 2012 were $1.0 million and $0.2 million, respectively. Because the Company does not intend to sell any of its investments in an unrealized loss position and it is more likely than not that it will not be required to sell the securities before the recovery of its amortized cost basis, which may not occur until maturity, it does not consider the securities to be other-than-temporarily impaired.
	Cost Method Investments
	The Company held direct investments in certain early-stage entities as of September 30, 2013 and December 31, 2012 of approximately $29.8 million and $26.2 million, respectively, which are accounted for based on the cost method and are included in Other assets in the accompanying condensed consolidated balance sheets. During the three and nine months ended September 30, 2013, the Company recorded a gain of $1.3 million and $2.3 million, respectively, from companies in which the Company held direct investments, which were acquired by a third party and was included in Other income (expense), net in the accompanying condensed consolidated statements of income. The Company periodically reviews these investments for impairment. If the Company determines that an other-than-temporary impairment has occurred, it will write-down the investment to its fair value.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
FAIR VALUE MEASUREMENTS	'
	6. FAIR VALUE MEASUREMENTS
	The authoritative guidance defines fair value as an exit price, representing the amount that would either be received to sell an asset or be paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, the guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

	•	Level 1. Observable inputs such as quoted prices in active markets for identical assets or liabilities;

	•	Level 2. Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and

	•	Level 3. Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
	Available-for-sale securities included in Level 2 are valued utilizing inputs obtained from an independent pricing service (the “Service”) which uses quoted market prices for identical or comparable instruments rather than direct observations of quoted prices in active markets. The Service gathers observable inputs for all of the Company’s fixed income securities from a variety of industry data providers including, for example, large custodial institutions and other third-party sources. Once the observable inputs are gathered by the Service, all data points are considered and an average price is determined. The Service’s providers utilize a variety of inputs to determine their quoted prices. These inputs may include interest rates, known historical trades, yield curve information, benchmark data, prepayment speeds, credit quality and broker/dealer quotes. Substantially all of the Company’s available-for-sale investments are valued utilizing inputs obtained from the Service and accordingly are categorized as Level 2 in the table below. The Company periodically independently assesses the pricing obtained from the Service and historically has not adjusted the Service's pricing as a result of this assessment. Available-for-sale securities are included in Level 3 when relevant observable inputs for a security are not available.
	The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the classification of assets and liabilities within the fair value hierarchy. In certain instances, the inputs used to measure fair value may meet the definition of more than one level of the fair value hierarchy. The input with the lowest level priority is used to determine the applicable level in the fair value hierarchy.
	Assets and Liabilities Measured at Fair Value on a Recurring Basis


		As of September 30, 2013			Quoted			Significant			Significant
					Prices In			Other			Unobservable
					Active Markets			Observable			Inputs (Level 3)
					for Identical			Inputs (Level 2)
					Assets (Level 1)
		(in thousands)
	Assets:
	Cash and cash equivalents:
	Cash	$	189,065		$	189,065		$	—		$	—

	Money market funds	51,159			51,159			—			—

	Corporate securities	4,249			—			4,249			—

	Municipal securities	2,000			—			2,000			—

	Available-for-sale securities:
	Agency securities	528,428			—			528,428			—

	Corporate securities	679,723			—			670,632			9,091

	Municipal securities	72,959			—			72,959			—

	Government securities	128,508			—			128,508			—

	Prepaid expenses and other current assets:
	Foreign currency derivatives	5,117			—			5,117			—

	Total assets	$	1,661,208		$	240,224		$	1,411,893		$	9,091

	Accrued expenses and other current liabilities:
	Foreign currency derivatives	2,822			—			2,822			—

	Total liabilities	$	2,822		$	—		$	2,822		$	—



		As of December 31, 2012			Quoted			Significant			Significant
					Prices In			Other			Unobservable
					Active Markets			Observable			Inputs (Level 3)
					for Identical			Inputs (Level 2)
					Assets (Level 1)
		(in thousands)
	Assets:
	Cash and cash equivalents:
	Cash	$	503,614		$	503,614		$	—		$	—

	Money market funds	123,519			123,519			—			—

	Corporate securities	16,476			—			16,476			—

Available-for-sale securities:
Agency securities	402,707			—			402,707			—

Corporate securities	405,322			—			401,981			3,341

Municipal securities	32,313			—			32,313			—

Government securities	39,993			—			39,993			—

Prepaid expenses and other current assets:
Foreign currency derivatives	4,157			—			4,157			—

Total assets	$	1,528,101		$	627,133		$	897,627		$	3,341

Accrued expenses and other current liabilities:
Foreign currency derivatives	4,162			—			4,162			—

Total liabilities	$	4,162		$	—		$	4,162		$	—

The Company’s fixed income available-for-sale security portfolio generally consists of investment grade securities from diverse issuers with a minimum credit rating of A-/A3 and a weighted-average credit rating of AA-/Aa3. The Company values these securities based on pricing from the Service, whose sources may use quoted prices in active markets for identical assets (Level 1 inputs) or inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs) in determining fair value, and accordingly, the Company classifies all of its fixed income available-for-sale securities as Level 2.
The Company measures its cash flow hedges, which are classified as Prepaid expenses and other current assets and Accrued expenses and other current liabilities, at fair value based on indicative prices in active markets (Level 2 inputs).
Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)
The Company has invested in convertible debt securities of certain early-stage entities that are classified as available-for-sale investments. As quoted prices in active markets or other observable inputs were not available for these investments, in order to measure them at fair value, the Company utilized a discounted cash flow model using a discount rate reflecting the market risk inherent in holding securities of an early-stage enterprise, adjusted by the probability-weighted exit possibilities associated with the convertible debt securities. This methodology required the Company to make assumptions that were not directly or indirectly observable regarding the fair value of the convertible debt securities; accordingly they are a Level 3 valuation and are included in the table below.


	Investments
	(in thousands)
Balance at December 31, 2012	$	3,341

Purchases of Level 3 securities	6,000

Transfers out of Level 3	(250		)
Balance at September 30, 2013	$	9,091

Transfers out of Level 3 relate to certain of the Company's investments in convertible debt securities of early-stage entities that were reclassified from available-for-sale investments to cost method investments upon conversion to equity ownership, which are included in Other assets in the accompanying condensed consolidated balance sheets.
Additional Disclosures Regarding Fair Value Measurements
The carrying value of accounts receivable, accounts payable and accrued expenses approximate their fair value due to the short maturity of these items.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
STOCK-BASED COMPENSATION	'
	7. STOCK-BASED COMPENSATION
	The Company’s stock-based compensation program is a long-term retention program that is intended to attract and reward talented employees and align stockholder and employee interests. As of September 30, 2013, the Company had two stock-based compensation plans under which it was granting stock options and non-vested stock units. The Company is currently granting stock-based awards from its Amended and Restated 2005 Equity Incentive Plan (as amended, the “2005 Plan”) and its Amended and Restated 2005 Employee Stock Purchase Plan (as amended, the “2005 ESPP”). In connection with certain of the Company’s acquisitions, the Company has assumed certain plans from acquired companies. The Company’s Board of Directors has provided that no new awards will be granted under the Company’s acquired stock plans. Awards previously granted under the Company's superseded and expired stock plans that are still outstanding typically expire ten years from the date of grant and will continue to be subject to all the terms and conditions of such plans, as applicable. The Company’s superseded and expired stock plans include the Amended and Restated 1995 Stock Plan, Second Amended and Restated 2000 Director and Officer Stock Option and Incentive Plan and Second Amended and Restated 1995 Non-Employee Director Stock Option Plan.
	Under the terms of the 2005 Plan, the Company is authorized to grant incentive stock options (“ISOs”), non-qualified stock options (“NSOs”), non-vested stock, non-vested stock units, stock appreciation rights (“SARs”), and performance units and to make stock-based awards to full and part-time employees of the Company and its subsidiaries or affiliates, where legally eligible to participate, as well as to consultants and non-employee directors of the Company. Currently, the 2005 Plan provides for the issuance of a maximum of 48,600,000 shares of common stock. Under the 2005 Plan, ISOs must be granted at exercise prices no less than fair market value on the date of grant, except for ISOs granted to employees who own more than 10% of the Company’s combined voting power, for which the exercise prices must be no less than 110% of the fair market value at the date of grant. NSOs and SARs must be granted at no less than fair market value on the date of grant, or in the case of SARs in tandem with options, at the exercise price of the related option. Non-vested stock awards may be granted for such consideration in cash, other property or services, or a combination thereof, as determined by the Company’s Compensation Committee of its Board of Directors. Stock-based awards are generally exercisable or issuable upon vesting. The Company’s policy is to recognize compensation cost for awards with only service conditions and a graded vesting schedule on a straight-line basis over the requisite service period for the entire award. As of September 30, 2013, there were 27,409,886 shares of common stock reserved for issuance pursuant to the Company’s stock-based compensation plans and the Company had authorization under its 2005 Plan to grant 16,965,265 additional stock-based awards.
	Under the 2005 ESPP, all full-time and certain part-time employees of the Company are eligible to purchase common stock of the Company twice per year at the end of a six-month payment period (a “Payment Period”). During each Payment Period, eligible employees who so elect may authorize payroll deductions in an amount no less than 1% nor greater than 10% of his or her base pay for each payroll period in the Payment Period. At the end of each Payment Period, the accumulated deductions are used to purchase shares of common stock from the Company up to a maximum of 12,000 shares for any one employee during a Payment Period. Shares are purchased at a price equal to 85% of the fair market value of the Company’s common stock on the last business day of a Payment Period. Employees who, after exercising their rights to purchase shares of common stock in the 2005 ESPP, would own shares representing 5% or more of the voting power of the Company’s common stock, are ineligible to participate under the 2005 ESPP. The 2005 ESPP provides for the issuance of a maximum of 10,000,000 shares of common stock. As of September 30, 2013, 2,991,834 shares had been issued under the 2005 ESPP. The Company recorded stock-based compensation costs related to the 2005 ESPP of $1.1 million and $3.7 million for the three and nine months ended September 30, 2013, respectively, and for the three and nine months ended September 30, 2012 the company recorded stock-based compensation costs related to the 2005 ESPP of $1.1 million and $3.0 million, respectively.
	Stock-Based Compensation
	The detail of the total stock-based compensation recognized by income statement classification is as follows (in thousands):


		Three Months Ended				Three Months Ended				Nine Months Ended		Nine Months Ended
	Income Statement Classifications	September 30, 2013				September 30, 2012				September 30, 2013		September 30, 2012
	Cost of services and maintenance revenues	$	617			$	567			$	1,876	$	1,524

	Research and development	15,831				14,523				47,987		39,722

	Sales, marketing and services	16,249				13,977				48,910		37,254

	General and administrative	13,196				11,036				38,533		30,422

	Total	$	45,893			$	40,103			$	137,306	$	108,922

	Stock Options
	Stock options granted under the 2005 Plan typically have a five-year life and vest over three years, with 33.3% of the shares underlying the option vesting on the first anniversary of the date of grant and the remainder of the underlying shares vesting in equal monthly installments at a rate of 2.78% thereafter (the "Standard Vesting Rate"). There were no stock options granted during the three months ended September 30, 2013. The Company also assumes stock options from certain of its acquisitions for which the vesting period is typically reset to vest over three years at the Standard Vesting Rate. During the first quarter of 2013, the Company assumed in-the-money options from the Zenprise acquisition. See Note 4 for more information related to acquisitions. The Company currently uses the Black-Scholes option pricing model to determine the fair value of stock options. The determination of the fair value of stock-based payment awards on the date of grant using an option-pricing model is affected by the Company’s stock price and the options exercise prices, as well as assumptions regarding a number of complex and subjective variables. These variables include the Company’s expected stock price, volatility over the term of the awards, actual and historical employee exercise behaviors including historical exercise patterns of options with an exercise price less than the stock price on the date assumed, risk-free interest rate and expected dividends. For purposes of valuing stock options, the Company determined the expected volatility factor by considering the implied volatility in two-year market-traded options of the Company’s common stock based on third party volatility quotes in accordance with the provisions of SAB No. 107, Share Based Payment. The Company’s decision to use implied volatility was based upon the availability of actively traded options on the Company’s common stock and its assessment that implied volatility is more representative of future stock price trends than historical volatility. The approximate risk free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues with remaining terms equivalent to the Company’s expected terms on stock options. The expected term of stock options was based on the historical employee exercise patterns. The Company also periodically analyzes its historical pattern of option exercises based on certain demographic characteristics and determined that there were no meaningful differences in option exercise activity based on the demographic characteristics. The Company does not intend to pay dividends on its common stock in the foreseeable future. Accordingly, the Company used a dividend yield of zero in its option pricing model.
	The total intrinsic value of options exercised during the three and nine months ended September 30, 2013 was $28.7 million and $70.2 million, respectively, and the total intrinsic value of options exercised during the three and nine months ended September 30, 2012 was $39.8 million and $117.0 million, respectively. The intrinsic value is calculated as the difference between the market value on the date of exercise and the exercise price of the shares. As of September 30, 2013, there was $41.0 million of total unrecognized compensation cost related to stock options. That cost is expected to be recognized over a weighted-average period of 1.38 years.
	The assumptions used to value option grants are as follows:


		Three Months Ended			Nine Months Ended			Nine Months Ended
		September 30, 2012			September 30, 2013			September 30, 2012
	Expected volatility factor	0.43			0.39			0.38 - 0.43

	Approximate risk free interest rate	0.52	%		0.44	%		0.52% - 0.68%

	Expected term (in years)	3.91			3.35			3.91

	Expected dividend yield	0	%		0	%		0	%
	Non-vested Stock Units
	Market Performance and Service Condition Stock Units
	In March 2013 and 2012, the Company granted senior level employees non-vested stock unit awards representing, in the aggregate, 399,029 and 418,809 non-vested stock units, respectively, that vest based on certain target market performance and service conditions. The number of non-vested stock units underlying each award will be determined within sixty days of the calendar year following the end of a three-year performance period ending December 31, 2015 for the March 2013 awards and December 31, 2014 for the March 2012 awards. The attainment level under the award will be based on the Company's total return to stockholders over the performance period compared to the return on the Nasdaq Composite Total Return Index (the "XCMP"). If the Company's return is positive and meets or exceeds the indexed return, the number of non-vested stock units issued will be based on interpolation, with the maximum number of non-vested stock units issuable pursuant to the award capped at 200% of the target number of non-vested stock units set forth in the award agreement if the Company's return exceeds the indexed return by 40% or more. If the Company's return over the performance period is positive but underperforms the index, a number of non-vested stock units will be issued, below the target award, based on interpolation; however, no non-vested stock units will be issued if the Company's return underperforms the index by more than 20% over the performance period. In the event the Company's return to stockholders is negative but still meets or exceeds the indexed return, only 75% of the target award shall be issued. If the awardee is not employed by the Company at the end of the performance period; the extent to which the awardee will vest in the award, if at all, is dependent upon the timing and character of the termination as provided in the award agreement. Each non-vested stock unit, upon vesting, represents the right to receive one share of the Company's common stock.
	The market condition requirements are reflected in the grant date fair value of the award, and the compensation expense for the award will be recognized assuming that the requisite service is rendered regardless of whether the market conditions are achieved. The grant date fair value of the non-vested performance stock unit awards was determined through the use of a Monte Carlo simulation model, which utilized multiple input variables that determined the probability of satisfying the market condition requirements applicable to each award as follows:



		March 2013 Grant		March 2012 Grant
	Expected volatility factor	0.16 - 0.42		0.21 - 0.39

	Risk free interest rate	0.33	%	0.47	%
	Expected dividend yield	0	%	0	%
	The range of expected volatilities utilized was based on the historical volatilities of the Company's common stock and the XCMP. The Company chose to use historical volatility to value these awards because historical stock prices were used to develop the correlation coefficients between the Company and the XCMP in order to model the stock price movements. The volatilities used were calculated over the most recent 2.75 year period, which was the remaining term of the performance period at the date of grant. The risk free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues with remaining terms equivalent to the remaining performance period. The Company does not intend to pay dividends on its common stock in the foreseeable future. Accordingly, the Company used a dividend yield of zero in its model. The estimated fair value of each award as of the date of grant was $89.93 for the March 2013 grant and $89.95 for the March 2012 grant.
	Service Based Stock Units
	The Company also awards senior level and certain other employees non-vested stock units granted under the 2005 Plan that vest based on service. The majority of these non-vested stock unit awards vest 33.33% on each anniversary subsequent to the date of the award. The remaining awards vest 100% on the third anniversary of the grant date. Each non-vested stock unit, upon vesting, represents the right to receive one share of the Company’s common stock. In addition, the Company awards non-vested stock units to all of its non-employee directors. These awards vest monthly in 12 equal installments based on service and, upon vesting, each stock unit represents the right to receive one share of the Company's common stock.
	Unrecognized Compensation Related to Stock Units
	As of September 30, 2013, the number of non-vested stock units outstanding, including performance awards, market performance and service condition awards and service-based awards, and including awards assumed in connection with acquisitions, were 4,440,852. As of September 30, 2013, there was $248.1 million of total unrecognized compensation cost related to non-vested stock units. The unrecognized cost is expected to be recognized over a weighted-average period of 2.02 years. See Note 4 for more information regarding the Company's acquisitions.

Goodwill_And_Other_Intangible_

Goodwill And Other Intangible Assets	9 Months Ended
Goodwill And Other Intangible Assets	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
GOODWILL AND OTHER INTANGIBLE ASSETS	'
	8. GOODWILL AND OTHER INTANGIBLE ASSETS
	Goodwill
	The Company accounts for goodwill in accordance with the authoritative guidance, which requires that goodwill and certain intangible assets are not amortized, but are subject to an annual impairment test. There was no impairment of goodwill or indefinite lived intangible assets as a result of the annual impairment test analysis completed during the fourth quarter of 2012. There were no indicators of impairment during the three and nine months ended September 30, 2013. In-process R&D acquired in connection with the Company's acquisitions was not material. See Note 4 for more information regarding the Company's acquisitions and Note 9 for more information regarding the Company's segments.
	The following table presents the change in goodwill allocated to the Company’s reportable segments during the nine months ended September 30, 2013 (in thousands):


		Balance at January 1, 2013		Additions				Other					Balance at September 30, 2013
	Infrastructure	$	1,158,580	$	249,392			$	(4,683	)	-2		$	1,403,289
	Infrastructure	$	1,158,580	$	249,392			$	(4,683	)	-2		$	1,403,289
	SaaS	359,639		2,374				1,600			-3		363,613
	SaaS	359,639		2,374				1,600			-3		363,613
	Consolidated	$	1,518,219	$	251,766	-1		$	(3,083	)			$	1,766,902
	Consolidated	$	1,518,219	$	251,766	-1		$	(3,083	)			$	1,766,902




	-1	Amounts relate to Zenprise and 2013 Other Acquisition. See Note 4 for more information regarding the Company’s acquisitions.

	-2	Amount primarily relates to adjustments to the preliminary purchase price allocation associated with the Bytemobile acquisition, primarily related to adjustments of certain income tax assets and liabilities of $10.0 million, partially offset by a $5.9 million adjustment to current portion of deferred revenues.

	-3	Amount primarily relates to foreign currency translation.
	Intangible Assets
	The Company has intangible assets with finite lives that are recorded at cost, less accumulated amortization. Amortization is computed over the estimated useful lives of the respective assets, generally three to seven years, except for patents, which are amortized over the lesser of their remaining life or ten years. Intangible assets consist of the following (in thousands):


		September 30, 2013					December 31, 2012
		Gross Carrying		Accumulated			Gross Carrying				Accumulated
		Amount		Amortization			Amount				Amortization
	Product related intangible assets	$	675,659	$	406,224		$	620,032			$	339,608
	Product related intangible assets	$	675,659	$	406,224		$	620,032			$	339,608
	Other	473,740		209,179			446,601				170,820
	Other	473,740		209,179			446,601				170,820
	Total	$	1,149,399	$	615,403		$	1,066,633			$	510,428
	Total	$	1,149,399	$	615,403		$	1,066,633			$	510,428
	Amortization of product related intangible assets, which consists primarily of product-related technologies and patents, was $24.3 million and $22.9 million for the three months ended September 30, 2013 and 2012, respectively, and $73.4 million and $56.6 million for the nine months ended September 30, 2013 and 2012, respectively, and is classified as a component of Cost of net revenues in the accompanying condensed consolidated statements of income. Amortization of other intangible assets, which consist primarily of customer relationships, trade names and covenants not to compete was $10.4 million and $9.8 million for the three months ended September 30, 2013 and 2012, respectively, and $31.3 million and $25.5 million for the nine months ended September 30, 2013 and 2012, respectively, and is classified as a component of Operating expenses in the accompanying condensed consolidated statements of income. The Company monitors its intangible assets for indicators of impairment. If the Company determines that an impairment has occurred, it will write-down the intangible asset to its fair value. For the nine months ended September 30, 2012, Amortization of other intangible assets included a $5.2 million impairment related to the Company's decision to contribute its CloudStack tradename acquired in conjunction with its acquisition of Cloud.com to the Apache Software Foundation. As a result, the carrying value of the CloudStack tradename was written down to zero. See Note 4 for more information regarding the Company's acquisitions.
	Estimated future amortization expense is as follows (in thousands):


	Year ending December 31,
	2013	$	139,328
	2013	$	139,328
	2014	131,359
	2014	131,359
	2015	109,472
	2015	109,472
	2016	87,205
	2016	87,205
	2017	59,513
	2017	59,513

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
SEGMENT INFORMATION	'
	9. SEGMENT INFORMATION
	Infrastructure and SaaS constitute the Company’s two reportable segments. The Company does not engage in intercompany revenue transfers between segments. The Company’s chief operating decision maker (“CODM”) evaluates the Company’s performance based primarily on profitability from its Infrastructure and SaaS segments products. Segment profit for each segment includes certain research and development, sales, marketing and services and general and administrative expenses directly attributable to the segment as well as other corporate costs allocated to the segment and excludes certain expenses that are managed outside of the reportable segments. Costs excluded from segment profit primarily consist of stock-based compensation costs, amortization of product related intangible assets, amortization of other intangible assets, net interest and other income, net. Accounting policies of the Company’s segments are the same as its consolidated accounting policies.
	Net revenues and segment profit, classified by the Company’s two reportable segments were as follows (in thousands):


		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2013				2012				2013				2012
	Net revenues:
	Infrastructure	$	564,552			$	511,763			$	1,686,411			$	1,470,225

	SaaS	148,179				129,659				429,603				375,902

	Consolidated	$	712,731			$	641,422			$	2,116,014			$	1,846,127

	Segment profit:
	Infrastructure	$	134,598			$	130,566			$	380,445			$	371,515

	SaaS	33,378				24,720				81,427				64,828

	Unallocated expenses (1):
	Amortization of intangible assets	(34,716		)		(32,768		)		(104,703		)		(82,064		)
	Net interest and other income	3,438				8,483				6,009				15,636

	Stock-based compensation	(45,893		)		(40,103		)		(137,306		)		(108,922		)
	Consolidated income before income taxes	$	90,805			$	90,898			$	225,872			$	260,993





	-1	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.
	Revenues by Product Grouping
	Revenues by product grouping for the Company’s Infrastructure and SaaS segments were as follows (in thousands):


		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2013				2012				2013				2012
	Net revenues:
	Infrastructure
	Mobile and Desktop revenues(1)	$	380,878			$	351,607			$	1,121,102			$	1,037,144

	Networking and Cloud Solutions revenues(2)	146,474				127,327				458,753				340,319

	Professional services(3)	33,725				31,022				96,653				86,141

	Other	3,475				1,807				9,903				6,621

	Total Infrastructure revenues	564,552				511,763				1,686,411				1,470,225

	SaaS revenues	148,179				129,659				429,603				375,902

	Total net revenues	$	712,731			$	641,422			$	2,116,014			$	1,846,127





	-1	Mobile and Desktop revenues are primarily comprised of sales from the Company’s desktop virtualization products, XenDesktop and XenApp, and the Company's Mobility products, which include XenMobile and related license updates and maintenance and support.

	-2	Networking and Cloud revenues are primarily comprised of sales from the Company’s cloud networking products, which include NetScaler, CloudBridge and Bytemobile Smart Capacity, and the Company’s cloud platform products which include XenServer, CloudPlatform and CloudPortal and related license updates and maintenance and support.

-3	Professional services revenues are primarily comprised of revenues from consulting services and product training and certification services.
Revenues by Geographic Location
The following table presents revenues by segment and geographic location, for the following periods (in thousands):


	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2013				2012				2013				2012
Net revenues:
Infrastructure
Americas	$	306,050			$	281,896			$	925,395			$	794,148

EMEA	188,220				164,149				553,637				488,196

Asia-Pacific	70,282				65,718				207,379				187,881

Total Infrastructure revenues	564,552				511,763				1,686,411				1,470,225

SaaS
Americas	124,044				109,935				360,954				319,946

EMEA	18,522				15,941				53,266				45,974

Asia-Pacific	5,613				3,783				15,383				9,982

Total SaaS revenues	148,179				129,659				429,603				375,902

Total net revenues	$	712,731			$	641,422			$	2,116,014			$	1,846,127

Derivative_Financial_Instrumen

Derivative Financial Instruments

9 Months Ended

Sep. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE FINANCIAL INSTRUMENTS

10. DERIVATIVE FINANCIAL INSTRUMENTS

Derivatives Designated as Hedging Instruments

As of September 30, 2013, the Company’s derivative assets and liabilities primarily resulted from cash flow hedges related to its forecasted operating expenses transacted in local currencies. A substantial portion of the Company’s overseas expenses are and will continue to be transacted in local currencies. To protect against fluctuations in operating expenses and the volatility of future cash flows caused by changes in currency exchange rates, the Company has established a program that uses foreign exchange forward contracts to hedge its exposure to these potential changes. The terms of these instruments, and the hedged transactions to which they relate, generally do not exceed 12 months.

Generally, when the dollar is weak, foreign currency denominated expenses will be higher, and these higher expenses will be partially offset by the gains realized from the Company’s hedging contracts. Conversely, if the dollar is strong, foreign currency denominated expenses will be lower. These lower expenses will in turn be partially offset by the losses incurred from the Company’s hedging contracts. The change in the derivative component in Accumulated other comprehensive loss includes unrealized gains or losses that arose from changes in market value of the effective portion of derivatives that were held during the period, and gains or losses that were previously unrealized but have been recognized in the same line item as the forecasted transaction in current period net income due to termination or maturities of derivative contracts. This reclassification has no effect on total comprehensive income or equity.

The total cumulative unrealized gain on cash flow derivative instruments was $2.2 million and nil at September 30, 2013 and December 31, 2012, respectively, and is included in Accumulated other comprehensive loss in the accompanying condensed consolidated balance sheets. See Note 11 for more information related to comprehensive income. The net unrealized gain as of September 30, 2013 is expected to be recognized in income over the next 12 months at the same time the hedged items are recognized in income.

Derivatives not Designated as Hedging Instruments

A substantial portion of the Company’s overseas assets and liabilities are and will continue to be denominated in local currencies. To protect against fluctuations in earnings caused by changes in currency exchange rates when remeasuring the Company’s balance sheet, it utilizes foreign exchange forward contracts to hedge its exposure to this potential volatility.

These contracts are not designated for hedge accounting treatment under the authoritative guidance. Accordingly, changes in the fair value of these contracts are recorded in Other income (expense), net.

Fair Values of Derivative Instruments

Asset Derivatives

Liability Derivatives

(In thousands)

September 30, 2013

December 31, 2012

September 30, 2013

December 31, 2012

Derivatives Designated as

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Hedging Instruments

Location

Value

Location

Value

Location

Value

Location

Value

Foreign currency forward contracts

Prepaid

$4,686

Prepaid

$4,157

Accrued

$2,392

Accrued

$4,162

expenses

and other

current

assets

liabilities

Asset Derivatives

Liability Derivatives

(In thousands)

September 30, 2013

December 31, 2012

September 30, 2013

December 31, 2012

Derivatives Not Designated as

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Hedging Instruments

Location

Value

Location

Value

Location

Value

Location

Value

Foreign currency forward contracts

Prepaid

$431

Prepaid

$448

Accrued

$430

Accrued

$52

expenses

and other

current

assets

liabilities

The Effect of Derivative Instruments on Financial Performance

For the Three Months Ended September 30,

(In thousands)

Derivatives in Cash Flow

Amount of Gain Recognized in Other

Location of Loss Reclassified

Amount of Loss Reclassified from

Hedging Relationships

Comprehensive Income

from Accumulated Other

Accumulated Other

(Effective Portion)

Comprehensive Loss into

Comprehensive Loss

Income

(Effective Portion)

2013

2012

2013

2012

Foreign currency forward contracts

5,158

4,765

Operating expenses

(1,262

)

(2,530

)

For the Nine Months Ended September 30,

(In thousands)

Derivatives in Cash Flow

Amount of Gain Recognized in Other

Location of Loss Reclassified

Amount of Loss Reclassified from

Hedging Relationships

Comprehensive Income (Effective Portion)

from Accumulated Other

Accumulated Other

Comprehensive Loss into

Comprehensive Loss

Income

(Effective Portion)

2013

2012

2013

2012

Foreign currency forward contracts

2,175

4,727

Operating expenses

(3,574

)

(4,836

)

There was no material ineffectiveness in the Company’s foreign currency hedging program in the periods presented.

For the Three Months Ended September 30,

(In thousands)

Derivatives Not Designated as Hedging Instruments

Location of Gain

Amount of Gain (Loss) Recognized in Income on Derivative

(Loss) Recognized in Income on

Derivative

2013

2012

Foreign currency forward contracts

Other income (expense), net

264

(604

)

For the Nine Months Ended September 30,

(In thousands)

Derivatives Not Designated as Hedging Instruments

Location of Gain (Loss) Recognized in Income on

Amount of Gain (Loss) Recognized in Income on Derivative

Derivative

2013

2012

Foreign currency forward contracts

Other income (expense), net

1,991

(1,943

)

Outstanding Foreign Currency Forward Contracts

As of September 30, 2013, the Company had the following net notional foreign currency forward contracts outstanding (in thousands):

Foreign Currency

Currency

Denomination

Australian Dollar

AUD 2,963

Pounds Sterling

GBP 32,600

Canadian Dollar

CAD 5,700

Chinese Yuan Renminbi

CNY 72,950

Danish Krone

DKK 3,600

Euro

EUR 28,746

Hong Kong Dollar

HKD 51,106

Indian Rupee

INR 852,150

Japanese Yen

JPY 434,700

New Zealand Dollar

NZD 100

Singapore Dollar

SGD 11,500

Swiss Franc

CHF 20,082

Comprehensive_Income

Comprehensive Income	9 Months Ended
Comprehensive Income	Sep. 30, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]	'
COMPREHENSIVE INCOME	'
	11. COMPREHENSIVE INCOME
	The changes in Accumulated other comprehensive loss by component, net of tax, are as follows (in thousands):


		Foreign currency				Unrealized gain (loss) on available-for-sale securities			Unrealized gain (loss) on derivative instruments			Other comprehensive loss on pension liability			Total
		(In thousands)
	Balance at December 31, 2012	$	(3,024	)		$	2,426		$	(10	)	$	(7,097	)	$	(7,705	)
	Balance at December 31, 2012	$	(3,024	)		$	2,426		$	(10	)	$	(7,097	)	$	(7,705	)
	Other comprehensive income before reclassifications	4,099				(1,470		)	(1,399		)	(334		)	896
	Other comprehensive income before reclassifications	4,099				(1,470		)	(1,399		)	(334		)	896
	Amounts reclassified from accumulated other comprehensive loss	—				13			3,574			—			3,587
		—				13			3,574			—			3,587
	Net current period other comprehensive income	4,099				(1,457		)	2,175			(334		)	4,483
	Net current period other comprehensive income	4,099				(1,457		)	2,175			(334		)	4,483
	Balance at September 30, 2013	$	1,075			$	969		$	2,165		$	(7,431	)	$	(3,222	)
	Balance at September 30, 2013	$	1,075			$	969		$	2,165		$	(7,431	)	$	(3,222	)
	Income tax expense or benefit allocated to each component of other comprehensive income is not material.
	Reclassifications out of accumulated other comprehensive loss are as follows (in thousands):


			For the Three Months Ended September 30,
			(In thousands)
	Details about accumulated other comprehensive loss components		Amount reclassified from accumulated other comprehensive loss, net of tax				Affected line item in the Condensed Consolidated Statements of Income
	Unrealized net losses on available-for-sale securities		$	(44	)		Other income (expense), net
	Unrealized net losses on cash flow hedges		(1,262		)		Operating expenses *
			$	(1,306	)


			For the Nine Months Ended September 30,
			(In thousands)
	Details about accumulated other comprehensive loss components		Amount reclassified from accumulated other comprehensive loss, net of tax				Affected line item in the Condensed Consolidated Statements of Income
	Unrealized net losses on available-for-sale securities		$	(13	)		Other income (expense), net
	Unrealized net losses on cash flow hedges		(3,574		)		Operating expenses *
			$	(3,587	)
	* Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Income_Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
INCOME TAXES	'
	12. INCOME TAXES
	The Company’s net unrecognized tax benefits totaled approximately $57.6 million and $43.9 million as of September 30, 2013 and December 31, 2012, respectively. All amounts included in the balance at September 30, 2013 for tax positions would affect the annual effective tax rate. The Company has no amounts accrued for the payment of interest and penalties as of September 30, 2013.
	The Company and one or more of its subsidiaries is subject to federal income taxes in the United States, as well as income taxes of multiple state and foreign jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years prior to 2009.
	In the ordinary course of global business, there are transactions for which the ultimate tax outcome is uncertain; thus, judgment is required in determining the worldwide provision for income taxes. The Company provides for income taxes on transactions based on its estimate of the probable liability. The Company adjusts its provision as appropriate for changes that impact its underlying judgments. Changes that impact provision estimates include such items as jurisdictional interpretations on tax filing positions based on the results of tax audits and general tax authority rulings. Due to the evolving nature of tax rules combined with the large number of jurisdictions in which the Company operates, it is possible that the Company’s estimates of its tax liability and the realizability of its deferred tax assets could change in the future, which may result in additional tax liabilities and adversely affect the Company’s results of operations, financial condition and cash flows.
	The Company is required to estimate its income taxes in each of the jurisdictions in which it operates as part of the process of preparing its condensed consolidated financial statements. At September 30, 2013, the Company had approximately $151.0 million in net deferred tax assets. The authoritative guidance requires a valuation allowance to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company reviews deferred tax assets periodically for recoverability and makes estimates and judgments regarding the expected geographic sources of taxable income and gains from investments, as well as tax planning strategies in assessing the need for a valuation allowance.
	The Company maintains certain strategic management and operational activities in overseas subsidiaries and its foreign earnings are taxed at rates that are generally lower than in the United States. The Company does not expect to remit earnings from its foreign subsidiaries. The Company’s effective tax rate was approximately 15.5% and 13.9% for the three months ended September 30, 2013 and 2012, respectively, and 11.1% and 8.6% for the nine months ended September 30, 2013 and 2012, respectively. The increase in the effective tax rate when comparing the nine months ended September 30, 2013 to the nine months ended September 30, 2012 was primarily due to the impact of the IRS settlement for the tax years 2006 through 2008 that closed during the three months ended June 30, 2012.
	The Company’s effective tax rate generally differs from the U.S. federal statutory rate of 35% due primarily to lower tax rates on earnings generated by the Company’s foreign operations that are taxed primarily in Switzerland. The Company has not provided for U.S. taxes for those earnings because it plans to reinvest all of those earnings indefinitely outside the United States.

Treasury_Stock

Treasury Stock	9 Months Ended
Treasury Stock	Sep. 30, 2013
Equity [Abstract]	'
TREASURY STOCK	'
	13. TREASURY STOCK
	Stock Repurchase Programs
	The Company’s Board of Directors authorized an ongoing stock repurchase program with a total repurchase authority granted to the Company of $3.9 billion, of which $500.0 million was approved in October 2013. The Company may use the approved dollar authority to repurchase stock at any time until the approved amount is exhausted. The objective of the Company’s stock repurchase program is to improve stockholders’ returns. At September 30, 2013, approximately $179.3 million was available to repurchase common stock pursuant to the stock repurchase program. All shares repurchased are recorded as treasury stock. A portion of the funds used to repurchase stock over the course of the program was provided by proceeds from employee stock option exercises and the related tax benefit.
	The Company is authorized to make open market purchases of its common stock using general corporate funds through open market purchases or pursuant to a Rule 10b5-1 plan.
	During the three months ended September 30, 2013, the Company expended approximately $55.3 million on open market purchases, repurchasing 764,800 shares of outstanding common stock at an average price of $72.30. During the nine months ended September 30, 2013, the Company expended approximately $156.3 million on open market purchases, repurchasing 2,240,050 shares of outstanding common stock at an average price of $69.79.
	During the three months ended September 30, 2012, the Company expended approximately $75.0 million on open market purchases, repurchasing 983,200 shares of outstanding common stock at an average price of $76.24. During the nine months ended September 30, 2012, the Company expended approximately $175.0 million on open market purchases, repurchasing 2,361,800 shares of outstanding common stock at an average price of $74.08.
	Shares for Tax Withholding
	During the three months ended September 30, 2013, the Company withheld 43,035 shares from stock units that vested, totaling $2.9 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. During the nine months ended September 30, 2013, the Company withheld 389,369 shares from stock units that vested, totaling $27.7 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. These shares are reflected as treasury stock in the Company’s condensed consolidated balance sheets and the related cash outlays do not reduce the Company’s total stock repurchase authority.
	During the three months ended September 30, 2012, the Company withheld 31,733 shares from stock units that vested, totaling $2.5 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. During the nine months ended September 30, 2012, the Company withheld 227,604 shares from stock units that vested, totaling $17.5 million, to satisfy minimum tax withholding obligations that arose on the vesting of stock units. These shares are reflected as treasury stock in the Company’s condensed consolidated balance sheets and the related cash outlays do not reduce the Company’s total stock repurchase authority.

Commitments_And_Contingencies

Commitments And Contingencies	9 Months Ended
Commitments And Contingencies	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
COMMITMENTS AND CONTINGENCIES	'
	14. COMMITMENTS AND CONTINGENCIES
	Leases
	The Company leases certain office space and equipment under various operating leases. In addition to rent, the leases require the Company to pay for taxes, insurance, maintenance and other operating expenses. Certain of these leases contain stated escalation clauses while others contain renewal options. The Company recognizes rent expense on a straight-line basis over the term of the lease, excluding renewal periods, unless renewal of the lease is reasonably assured.
	Legal Matters
	The Company accrues a liability for legal contingencies when it believes that it is both probable that a liability has been incurred and that it can reasonably estimate the amount of the loss. The Company reviews these accruals and adjusts them to reflect ongoing negotiations, settlements, rulings, advice of legal counsel and other relevant information. To the extent new information is obtained and the Company's views on the probable outcomes of claims, suits, assessments, investigations or legal proceedings change, changes in the Company's accrued liabilities would be recorded in the period in which such determination is made. For the Other Matters referenced below, the amount of liability is not probable or the amount cannot be reasonably estimated; and, therefore, accruals have not been made. In addition, in accordance with the relevant authoritative guidance, for matters in which the likelihood of material loss is at least reasonably possible, the Company provides disclosure of the possible loss or range of loss. If a reasonable estimate cannot be made, however, the Company will provide disclosure to that effect.
	On April 11, 2008, SSL Services, LLC (“SSL Services”) filed a suit for patent infringement against the Company in the United States District Court for the Eastern District of Texas (the “SSL Matter”). SSL Services alleged that the Company infringed U.S. Patent Nos. 6,061,796 (the “'796 patent”) and 6,158,011 (the “'011 patent”). The Company denied infringement and asserted that the patents-in-suit were invalid. A jury trial was held on SSL Services' claims, and on June 18, 2012, the jury found that the Company does not infringe the '796 patent and found that the Company willfully infringes the '011 patent through the sale and use of certain products. The jury awarded SSL Services $10.0 million. On September 17, 2012, the court issued a final judgment confirming the jury award of $10.0 million in damages and added $5.0 million in enhanced damages and approximately $5.0 million in prejudgment interest on the damages award. The Company does not believe that any of its products infringe the '011 patent, and the Company believes that the '011 patent is invalid. Accordingly, no accrual has been made related to this matter. The Company has appealed the district court's judgment on the '011 patent.
	In addition to the SSL Matter and due to the nature of the Company's business, the Company is subject to patent infringement claims, including current suits against it or one or more of its wholly-owned subsidiaries alleging infringement by various Company products and services (the "Other Matters"). The Company believes that it has meritorious defenses to the allegations made in its pending cases and intends to vigorously defend these lawsuits; however, it is unable currently to determine the ultimate outcome of these or similar matters. In addition, the Company is a defendant in various litigation matters generally arising out of the normal course of business. Although it is difficult to predict the ultimate outcomes of these cases, the Company believes that it is not reasonably possible that the ultimate outcomes will materially and adversely affect its business, financial position, results of operations or cash flows.
	Guarantees
	The authoritative guidance requires certain guarantees to be recorded at fair value and requires a guarantor to make disclosures, even when the likelihood of making any payments under the guarantee is remote. For those guarantees and indemnifications that do not fall within the initial recognition and measurement requirements of the authoritative guidance, the Company must continue to monitor the conditions that are subject to the guarantees and indemnifications, as required under existing generally accepted accounting principles, to identify if a loss has been incurred. If the Company determines that it is probable that a loss has been incurred, any such estimable loss would be recognized. The initial recognition and measurement requirements do not apply to the provisions contained in the majority of the Company’s software license agreements that indemnify licensees of the Company’s software from damages and costs resulting from claims alleging that the Company’s software infringes the intellectual property rights of a third party. The Company has not made payments pursuant to these provisions. The Company has not identified any losses that are probable under these provisions and, accordingly, the Company has not recorded a liability related to these indemnification provisions.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
Recent Accounting Pronouncements	Sep. 30, 2013
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
RECENT ACCOUNTING PRONOUNCEMENTS	'
	15. RECENT ACCOUNTING PRONOUNCEMENTS
	In July 2013, the FASB issued an accounting standard update that provides explicit guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. Under the new standard, the Company's unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal year 2014 and applied prospectively with early adoption and retrospective application permitted. The Company is currently evaluating the impact of this accounting standard update on its condensed consolidated financial statements.

Significant_Accounting_Policie1

Significant Accounting Policies (Policy)	9 Months Ended
Significant Accounting Policies (Policy)	Sep. 30, 2013
Accounting Policies [Abstract]	'
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Significant estimates made by management include the provision for doubtful accounts receivable, the provision to reduce obsolete or excess inventory to market, the provision for estimated returns, as well as sales allowances, the assumptions used in the valuation of stock-based awards, the assumptions used in the discounted cash flows to mark certain of its investments to market, the valuation of the Company’s goodwill, net realizable value of product related and other intangible assets, the provision for income taxes and the amortization and depreciation periods for intangible and long-lived assets. While the Company believes that such estimates are fair when considered in conjunction with the condensed consolidated financial position and results of operations taken as a whole, the actual amounts of such items, when known, will vary from these estimates.
Investments	'
	Investments
	Short-term and long-term investments as of September 30, 2013 and December 31, 2012 primarily consist of agency securities, corporate securities, municipal securities and government securities. Investments classified as available-for-sale are stated at fair value with unrealized gains and losses, net of taxes, reported in Accumulated other comprehensive loss. The Company classifies its available-for-sale investments as current and non-current based on their actual remaining time to maturity. The Company does not recognize changes in the fair value of its available-for-sale investments in income unless a decline in value is considered other-than-temporary in accordance with the authoritative guidance.
	The Company’s investment policy is designed to limit exposure to any one issuer depending on credit quality. The Company uses information provided by third parties to adjust the carrying value of certain of its investments to fair value at the end of each period. Fair values are based on a variety of inputs and may include interest rates, known historical trades, yield curve information, benchmark data, prepayment speeds, credit quality and broker/dealer quotes.
Inventory	'
	Inventory
	Inventories are stated at the lower of cost or market on a standard cost basis, which approximates actual cost. The Company’s inventories as of September 30, 2013 and December 31, 2012 primarily consist of finished goods.
Revenue Recognition	'
	Revenue Recognition
	Net revenues include the following categories: Product and licenses, Software as a service ("SaaS"), License updates and maintenance and Professional services. Product and licenses revenues primarily represent fees related to the licensing of the Company’s software and hardware appliance products. These revenues are reflected net of sales allowances, cooperative advertising agreements, partner incentive programs and provisions for returns. Shipping charges billed to customers are included in Product and license revenue and the related shipping costs are included in Cost of product and license revenue. SaaS revenues consist primarily of fees related to online service agreements, which are recognized ratably over the contract term, which is typically 12 months. In addition, SaaS revenues may also include set-up fees, which are recognized ratably over the contract term or the expected customer life, whichever is longer. License updates and maintenance revenues consist of fees related to the Subscription Advantage program and maintenance fees, which include technical support and hardware and software maintenance. The Company licenses many of its virtualization products bundled with a one-year contract for its Subscription Advantage program. Subscription Advantage is a renewable program that provides subscribers with immediate access to software upgrades, enhancements and maintenance releases when and if they become available during the term of the contract. Subscription Advantage and maintenance fees are recognized ratably over the term of the contract, which is typically 12 to 24 months. The Company capitalizes certain third-party commissions related to Subscription Advantage renewals. The capitalized commissions are amortized to Sales, marketing and services expense at the time the related deferred revenue is recognized as revenue. Hardware and software maintenance and support contracts are typically sold separately. Hardware maintenance includes technical support, the latest software upgrades and replacement of malfunctioning appliances. Dedicated account management is available as an add-on to the program for a higher level of service. Software maintenance includes unlimited support with product version upgrades. Professional services revenues are comprised of fees from consulting services related to the implementation of the Company’s products and fees from product training and certification, which are recognized as the services are provided.
	The Company recognizes revenue when it is earned and when all of the following criteria are met: persuasive evidence of the arrangement exists; delivery has occurred or the service has been provided and the Company has no remaining obligations; the fee is fixed or determinable; and collectability is probable.
	The majority of the Company’s product and license revenue consists of revenue from the sale of stand-alone software products. Stand-alone software sales generally include a perpetual license to the Company’s software and is subject to the industry specific software revenue recognition guidance. In accordance with this guidance, the Company allocates revenue to license updates related to its stand-alone software and any other undelivered elements of the arrangement based on vendor specific objective evidence (“VSOE”) of fair value of each element and such amounts are deferred until the applicable delivery criteria and other revenue recognition criteria described above have been met. The balance of the revenues, net of any discounts inherent in the arrangement, is recognized at the outset of the arrangement using the residual method as the product licenses are delivered. If management cannot objectively determine the fair value of each undelivered element based on VSOE of fair value, revenue recognition is deferred until all elements are delivered, all services have been performed, or until fair value can be objectively determined.
	For hardware appliance transactions, the arrangement consideration is allocated to stand-alone software deliverables as a group and the non-software deliverables based on the relative selling prices using the selling price hierarchy in the amended revenue recognition guidance. The selling price hierarchy for a deliverable is based on its VSOE if available, third-party evidence of selling price ("TPE") if VSOE is not available, or estimated selling price ("ESP") if neither VSOE nor TPE is available. The Company then recognizes revenue on each deliverable in accordance with its policies for product and service revenue recognition. VSOE of selling price is based on the price charged when the element is sold separately. In determining VSOE, the Company requires that a substantial majority of the selling prices fall within a reasonable range based on historical discounting trends for specific products and services. TPE of selling price is established by evaluating competitor products or services in stand-alone sales to similarly situated customers. However, as the Company’s products contain a significant element of proprietary technology and its solutions offer substantially different features and functionality, the comparable pricing of products with similar functionality typically cannot be obtained. Additionally, as the Company is unable to reliably determine what competitors products’ selling prices are on a stand-alone basis, the Company is not typically able to determine TPE. The estimate of selling price is established considering multiple factors including, but not limited to, pricing practices in different geographies and through different sales channels and competitor pricing strategies.
	For the Company’s non-software deliverables, it allocates the arrangement consideration based on the relative selling price of the deliverables. For the Company’s hardware appliances, it uses ESP as its selling price. For the Company’s support and services, it generally uses VSOE as its selling price. When the Company is unable to establish selling price using VSOE for its support and services, the Company uses ESP in its allocation of arrangement consideration.
	The Company’s SaaS products are considered service arrangements per the authoritative guidance; accordingly, the Company follows the provisions of Securities and Exchange Commission Staff Accounting Bulletin (“SAB”) No. 104, Revenue Recognition, when accounting for these service arrangements. Generally, the Company’s SaaS products are sold separately and not bundled with the Company's Infrastructure products and services.
	In the normal course of business, the Company is not obligated to accept product returns from its distributors under any conditions, unless the product item is defective in manufacture. The Company establishes provisions for estimated returns, as well as other sales allowances, concurrently with the recognition of revenue. The provisions are established based upon consideration of a variety of factors, including, among other things, recent and historical return rates for both specific products and distributors and the impact of any new product releases and projected economic conditions. Product returns are provided for in the condensed consolidated financial statements and have historically been within management’s expectations. Allowances for estimated product returns amounted to approximately $1.6 million and $2.6 million at September 30, 2013 and December 31, 2012, respectively. The Company also records estimated reductions to revenue for customer programs and incentive offerings, including volume-based incentives. The Company could take actions to increase its customer incentive offerings, which could result in an incremental reduction to revenue at the time the incentive is offered.
Foreign Currency	'
	Foreign Currency
	The functional currency for all of the Company’s wholly-owned foreign subsidiaries in its Infrastructure segment is the U.S. dollar. Monetary assets and liabilities of such subsidiaries are remeasured into U.S. dollars at exchange rates in effect at the balance sheet date, and revenues and expenses are remeasured at average rates prevailing during the year. The functional currency of the Company’s wholly-owned foreign subsidiaries of its SaaS segment is the currency of the country in which each subsidiary is located. The Company translates assets and liabilities of these foreign subsidiaries at exchange rates in effect at the balance sheet date. The Company includes accumulated net translation adjustments in equity as a component of Accumulated other comprehensive loss. Foreign currency transaction gains and losses are the result of exchange rate changes on transactions denominated in currencies other than the functional currency, including U.S. dollars. The remeasurement of those foreign currency transactions is included in determining net income or loss for the period of exchange. See Note 9 for information on the Company's Infrastructure and SaaS segments.
Accounting for Stock-Based Compensation Plans	'
	Accounting for Stock-Based Compensation Plans
	The Company has various stock-based compensation plans for its employees and outside directors and accounts for stock-based compensation arrangements in accordance with the authoritative guidance, which requires the Company to measure and record compensation expense in its condensed consolidated financial statements using a fair value method. See Note 7 for further information regarding the Company’s stock-based compensation plans.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Net Income Per Share Basic And Diluted	'
	The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share information):


		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Numerator:
	Net income	$	76,730	$	78,245	$	200,879	$	238,518

	Denominator:
	Denominator for basic earnings per share - weighted-average shares outstanding	187,459		186,864		187,120		186,326

	Effect of dilutive employee stock awards	1,521		2,807		1,710		2,956

	Denominator for diluted earnings per share - weighted-average shares outstanding	188,980		189,671		188,830		189,282

	Basic earnings per share	$	0.41	$	0.42	$	1.07	$	1.28

	Diluted earnings per share	$	0.41	$	0.41	$	1.06	$	1.26

	Anti-dilutive weighted-average shares	3,286		3,355		3,851		3,336

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
Acquisitions (Tables)	Sep. 30, 2013
Business Acquisition [Line Items]	'
Business Acquisition, Pro Forma Information	'
	The following pro-forma information combines the consolidated results of the operations of the Company and Zenprise and the 2013 Other Acquisition as if the acquisitions had occurred at the beginning of fiscal year 2012 (in thousands, except per share data):


		Three Months Ended September 30,					Nine Months Ended September 30,
		2013			2012		2013		2012
	Revenues	$	713,082		$	644,121	$	2,116,998	$	1,851,618
	Revenues	$	713,082		$	644,121	$	2,116,998	$	1,851,618
	Income from operations	87,173			69,483		218,735		208,150
	Income from operations	87,173			69,483		218,735		208,150
	Net income	76,364			70,039		199,350		214,784
	Net income	76,364			70,039		199,350		214,784
	Per share - basic	0.41			0.37		1.07		1.15
	Per share - basic	0.41			0.37		1.07		1.15
	Per share - diluted	0.4			0.37		1.06		1.13
	Per share - diluted	0.4			0.37		1.06		1.13
Zenprise, Inc. [Member]	'
Business Acquisition [Line Items]	'
Estimated Fair Value of Assets Acquired and Liabilities Assumed	'
	The allocation of the total purchase price is summarized below (in thousands):


		Zenprise
		Purchase Price Allocation			Asset Life
	Current assets	$	10,943
	Current assets	$	10,943
	Other assets	668
	Other assets	668
	Property and equipment	431			Various
	Property and equipment	431			Various
	Deferred tax assets, non-current	35,656
	Deferred tax assets, non-current	35,656
	Intangible assets	69,200			1-7 years
	Intangible assets	69,200			1-7 years
	Goodwill	249,392			Indefinite
	Goodwill	249,392			Indefinite
	Assets acquired	366,290
	Assets acquired	366,290
	Current liabilities assumed	(8,475		)
	Long-term liabilities assumed	(3,107		)
	Deferred tax liabilities, non-current	(27,714		)
	Net assets acquired	$	326,994
	Net assets acquired	$	326,994
Schedule of Finite-lived Intangible Assets Acquired as Part of Business Combination	'
	Identifiable intangible assets acquired in connection with the Zenprise acquisition (in thousands) and the weighted-average lives are as follows:


		Zenprise			Asset Life
	Trade names	$	2,400		3.0 years
	Trade names	$	2,400		3.0 years
	Non-compete agreements	700			1.0 year
	Non-compete agreements	700			1.0 year
	Customer relationships	18,300			7.0 years
	Customer relationships	18,300			7.0 years
	Core and product technologies	47,800			6.0 years
	Core and product technologies	47,800			6.0 years
	Total	$	69,200
	Total	$	69,200
Bytemobile [Member]	'
Business Acquisition [Line Items]	'
Estimated Fair Value of Assets Acquired and Liabilities Assumed	'
	The purchase price for Bytemobile was allocated to the acquired net tangible and intangible assets based on its estimated fair value as of the date of the acquisition. The allocation of the total purchase price is summarized below (in thousands):


		Bytemobile
		Purchase Price Allocation			Asset Life
	Current assets	$	57,796
	Current assets	$	57,796
	Other assets	7,406
	Other assets	7,406
	Property and equipment	2,484			Various
	Property and equipment	2,484			Various
	Deferred tax assets, non-current	45,598
	Deferred tax assets, non-current	45,598
	Intangible assets	248,900			1-9 years
	Intangible assets	248,900			1-9 years
	Goodwill	221,251			Indefinite
	Goodwill	221,251			Indefinite
	Assets acquired	583,435
	Assets acquired	583,435
	Current liabilities assumed	(62,313		)
	Long-term liabilities assumed	(4,083		)
	Deferred tax liabilities, non-current	(111,905		)
	Net assets acquired	$	405,134
	Net assets acquired	$	405,134

Investments_Tables

Investments (Tables)	9 Months Ended
	Sep. 30, 2013
Investments [Abstract]	'
Schedule of investments in available-for-sale securities at fair values	'
	Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands):



		September 30, 2013									December 31, 2012
	Description of the	Amortized		Gross		Gross			Fair Value		Amortized		Gross		Gross			Fair Value
	Securities	Cost		Unrealized		Unrealized					Cost		Unrealized		Unrealized
				Gains		Losses							Gains		Losses
	Agency securities	$	527,430	$	1,440	$	(442	)	$	528,428	$	400,365	$	2,347	$	(5	)	$	402,707

	Corporate securities	679,443		785		(505		)	679,723		404,546		947		(171		)	405,322

	Municipal securities	72,951		65		(57		)	72,959		32,214		114		(15		)	32,313

	Government securities	128,220		295		(7		)	128,508		39,863		131		(1		)	39,993

	Total	$	1,408,044	$	2,585	$	(1,011	)	$	1,409,618	$	876,988	$	3,539	$	(192	)	$	880,335

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Assets And Liabilities Measured At Fair Value On A Recurring Basis	'
	Assets and Liabilities Measured at Fair Value on a Recurring Basis


		As of September 30, 2013				Quoted			Significant			Significant
						Prices In			Other			Unobservable
						Active Markets			Observable			Inputs (Level 3)
						for Identical			Inputs (Level 2)
						Assets (Level 1)
		(in thousands)
	Assets:
	Cash and cash equivalents:
	Cash	$	189,065			$	189,065		$	—		$	—

	Money market funds	51,159				51,159			—			—

	Corporate securities	4,249				—			4,249			—

	Municipal securities	2,000				—			2,000			—

	Available-for-sale securities:
	Agency securities	528,428				—			528,428			—

	Corporate securities	679,723				—			670,632			9,091

	Municipal securities	72,959				—			72,959			—

	Government securities	128,508				—			128,508			—

	Prepaid expenses and other current assets:
	Foreign currency derivatives	5,117				—			5,117			—

	Total assets	$	1,661,208			$	240,224		$	1,411,893		$	9,091

	Accrued expenses and other current liabilities:
	Foreign currency derivatives	2,822				—			2,822			—

	Total liabilities	$	2,822			$	—		$	2,822		$	—



		As of December 31, 2012				Quoted			Significant			Significant
						Prices In			Other			Unobservable
						Active Markets			Observable			Inputs (Level 3)
						for Identical			Inputs (Level 2)
						Assets (Level 1)
		(in thousands)
	Assets:
	Cash and cash equivalents:
	Cash	$	503,614			$	503,614		$	—		$	—

	Money market funds	123,519				123,519			—			—

	Corporate securities	16,476				—			16,476			—

	Available-for-sale securities:
	Agency securities	402,707				—			402,707			—

	Corporate securities	405,322				—			401,981			3,341

	Municipal securities	32,313				—			32,313			—

	Government securities	39,993				—			39,993			—

Prepaid expenses and other current assets:
Foreign currency derivatives	4,157				—			4,157			—

Total assets	$	1,528,101			$	627,133		$	897,627		$	3,341

Accrued expenses and other current liabilities:
Foreign currency derivatives	4,162				—			4,162			—

Total liabilities	$	4,162			$	—		$	4,162		$	—

Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs	'


		Investments
		(in thousands)
	Balance at December 31, 2012	$	3,341

	Purchases of Level 3 securities	6,000

	Transfers out of Level 3	(250		)
	Balance at September 30, 2013	$	9,091

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Total Stock-based Compensation Recognized by Income Statement Classification	'
	The detail of the total stock-based compensation recognized by income statement classification is as follows (in thousands):


		Three Months Ended				Three Months Ended				Nine Months Ended		Nine Months Ended
	Income Statement Classifications	September 30, 2013				September 30, 2012				September 30, 2013		September 30, 2012
	Cost of services and maintenance revenues	$	617			$	567			$	1,876	$	1,524

	Research and development	15,831				14,523				47,987		39,722

	Sales, marketing and services	16,249				13,977				48,910		37,254

	General and administrative	13,196				11,036				38,533		30,422

	Total	$	45,893			$	40,103			$	137,306	$	108,922

Schedule of Assumptions Used to Value Option Grants	'
	The assumptions used to value option grants are as follows:


		Three Months Ended			Nine Months Ended			Nine Months Ended
		September 30, 2012			September 30, 2013			September 30, 2012
	Expected volatility factor	0.43			0.39			0.38 - 0.43

	Approximate risk free interest rate	0.52	%		0.44	%		0.52% - 0.68%

	Expected term (in years)	3.91			3.35			3.91

	Expected dividend yield	0	%		0	%		0	%
Schedule of Assumptions Used to Value Nonvested Share Grants	'
	The grant date fair value of the non-vested performance stock unit awards was determined through the use of a Monte Carlo simulation model, which utilized multiple input variables that determined the probability of satisfying the market condition requirements applicable to each award as follows:



		March 2013 Grant		March 2012 Grant
	Expected volatility factor	0.16 - 0.42		0.21 - 0.39

	Risk free interest rate	0.33	%	0.47	%
	Expected dividend yield	0	%	0	%

Goodwill_And_Other_Intangible_1

Goodwill And Other Intangible Assets (Tables)	9 Months Ended
Goodwill And Other Intangible Assets (Tables)	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule Of The Change In Goodwill	'
	The following table presents the change in goodwill allocated to the Company’s reportable segments during the nine months ended September 30, 2013 (in thousands):


		Balance at January 1, 2013		Additions				Other					Balance at September 30, 2013
	Infrastructure	$	1,158,580	$	249,392			$	(4,683	)	-2		$	1,403,289
	Infrastructure	$	1,158,580	$	249,392			$	(4,683	)	-2		$	1,403,289
	SaaS	359,639		2,374				1,600			-3		363,613
	SaaS	359,639		2,374				1,600			-3		363,613
	Consolidated	$	1,518,219	$	251,766	-1		$	(3,083	)			$	1,766,902
	Consolidated	$	1,518,219	$	251,766	-1		$	(3,083	)			$	1,766,902




	-1	Amounts relate to Zenprise and 2013 Other Acquisition. See Note 4 for more information regarding the Company’s acquisitions.

	-2	Amount primarily relates to adjustments to the preliminary purchase price allocation associated with the Bytemobile acquisition, primarily related to adjustments of certain income tax assets and liabilities of $10.0 million, partially offset by a $5.9 million adjustment to current portion of deferred revenues.

	-3	Amount primarily relates to foreign currency translation.
Schedule Of Intangible Assets	'
	Intangible assets consist of the following (in thousands):


		September 30, 2013					December 31, 2012
		Gross Carrying		Accumulated			Gross Carrying				Accumulated
		Amount		Amortization			Amount				Amortization
	Product related intangible assets	$	675,659	$	406,224		$	620,032			$	339,608
	Product related intangible assets	$	675,659	$	406,224		$	620,032			$	339,608
	Other	473,740		209,179			446,601				170,820
	Other	473,740		209,179			446,601				170,820
	Total	$	1,149,399	$	615,403		$	1,066,633			$	510,428
	Total	$	1,149,399	$	615,403		$	1,066,633			$	510,428
Schedule Of Estimated Future Amortization Expense	'
	Estimated future amortization expense is as follows (in thousands):


	Year ending December 31,
	2013	$	139,328
	2013	$	139,328
	2014	131,359
	2014	131,359
	2015	109,472
	2015	109,472
	2016	87,205
	2016	87,205
	2017	59,513
	2017	59,513

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Net Revenues And Profit By Segment	'
	Net revenues and segment profit, classified by the Company’s two reportable segments were as follows (in thousands):


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Net revenues:
	Infrastructure	$	564,552		$	511,763		$	1,686,411		$	1,470,225

	SaaS	148,179			129,659			429,603			375,902

	Consolidated	$	712,731		$	641,422		$	2,116,014		$	1,846,127

	Segment profit:
	Infrastructure	$	134,598		$	130,566		$	380,445		$	371,515

	SaaS	33,378			24,720			81,427			64,828

	Unallocated expenses (1):
	Amortization of intangible assets	(34,716		)	(32,768		)	(104,703		)	(82,064		)
	Net interest and other income	3,438			8,483			6,009			15,636

	Stock-based compensation	(45,893		)	(40,103		)	(137,306		)	(108,922		)
	Consolidated income before income taxes	$	90,805		$	90,898		$	225,872		$	260,993





	-1	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.
Revenues by Product Grouping	'
	Revenues by product grouping for the Company’s Infrastructure and SaaS segments were as follows (in thousands):


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Net revenues:
	Infrastructure
	Mobile and Desktop revenues(1)	$	380,878		$	351,607		$	1,121,102		$	1,037,144

	Networking and Cloud Solutions revenues(2)	146,474			127,327			458,753			340,319

	Professional services(3)	33,725			31,022			96,653			86,141

	Other	3,475			1,807			9,903			6,621

	Total Infrastructure revenues	564,552			511,763			1,686,411			1,470,225

	SaaS revenues	148,179			129,659			429,603			375,902

	Total net revenues	$	712,731		$	641,422		$	2,116,014		$	1,846,127





	-1	Mobile and Desktop revenues are primarily comprised of sales from the Company’s desktop virtualization products, XenDesktop and XenApp, and the Company's Mobility products, which include XenMobile and related license updates and maintenance and support.

	-2	Networking and Cloud revenues are primarily comprised of sales from the Company’s cloud networking products, which include NetScaler, CloudBridge and Bytemobile Smart Capacity, and the Company’s cloud platform products which include XenServer, CloudPlatform and CloudPortal and related license updates and maintenance and support.

	-3	Professional services revenues are primarily comprised of revenues from consulting services and product training and certification services.
Revenues By Geographic Location	'
	The following table presents revenues by segment and geographic location, for the following periods (in thousands):


		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Net revenues:
	Infrastructure
	Americas	$	306,050		$	281,896		$	925,395		$	794,148

	EMEA	188,220			164,149			553,637			488,196

	Asia-Pacific	70,282			65,718			207,379			187,881

	Total Infrastructure revenues	564,552			511,763			1,686,411			1,470,225

	SaaS
	Americas	124,044			109,935			360,954			319,946

	EMEA	18,522			15,941			53,266			45,974

	Asia-Pacific	5,613			3,783			15,383			9,982

	Total SaaS revenues	148,179			129,659			429,603			375,902

	Total net revenues	$	712,731		$	641,422		$	2,116,014		$	1,846,127

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Schedule Of The Fair Values Of Derivative Instruments

Fair Values of Derivative Instruments

Asset Derivatives

Liability Derivatives

(In thousands)

September 30, 2013

December 31, 2012

September 30, 2013

December 31, 2012

Derivatives Designated as

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Hedging Instruments

Location

Value

Location

Value

Location

Value

Location

Value

Foreign currency forward contracts

Prepaid

$4,686

Prepaid

$4,157

Accrued

$2,392

Accrued

$4,162

expenses

and other

current

assets

liabilities

Asset Derivatives

Liability Derivatives

(In thousands)

September 30, 2013

December 31, 2012

September 30, 2013

December 31, 2012

Derivatives Not Designated as

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Hedging Instruments

Location

Value

Location

Value

Location

Value

Location

Value

Foreign currency forward contracts

Prepaid

$431

Prepaid

$448

Accrued

$430

Accrued

$52

expenses

and other

current

assets

liabilities

Schedule Of Effect Of Derivative Instruments On Financial Performance

The Effect of Derivative Instruments on Financial Performance

For the Three Months Ended September 30,

(In thousands)

Derivatives in Cash Flow

Amount of Gain Recognized in Other

Location of Loss Reclassified

Amount of Loss Reclassified from

Hedging Relationships

Comprehensive Income

from Accumulated Other

Accumulated Other

(Effective Portion)

Comprehensive Loss into

Comprehensive Loss

Income

(Effective Portion)

2013

2012

2013

2012

Foreign currency forward contracts

5,158

4,765

Operating expenses

(1,262

)

(2,530

)

For the Nine Months Ended September 30,

(In thousands)

Derivatives in Cash Flow

Amount of Gain Recognized in Other

Location of Loss Reclassified

Amount of Loss Reclassified from

Hedging Relationships

Comprehensive Income (Effective Portion)

from Accumulated Other

Accumulated Other

Comprehensive Loss into

Comprehensive Loss

Income

(Effective Portion)

2013

2012

2013

2012

Foreign currency forward contracts

2,175

4,727

Operating expenses

(3,574

)

(4,836

)

Schedule Of Net Notional Foreign Currency Forward Contracts Outstanding

As of September 30, 2013, the Company had the following net notional foreign currency forward contracts outstanding (in thousands):

Foreign Currency

Currency

Denomination

Australian Dollar

AUD 2,963

Pounds Sterling

GBP 32,600

Canadian Dollar

CAD 5,700

Chinese Yuan Renminbi

CNY 72,950

Danish Krone

DKK 3,600

Euro

EUR 28,746

Hong Kong Dollar

HKD 51,106

Indian Rupee

INR 852,150

Japanese Yen

JPY 434,700

New Zealand Dollar

NZD 100

Singapore Dollar

SGD 11,500

Swiss Franc

CHF 20,082

Cash Flow Hedging [Member]

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Schedule Of Effect Of Derivative Instruments On Financial Performance

There was no material ineffectiveness in the Company’s foreign currency hedging program in the periods presented.

For the Three Months Ended September 30,

(In thousands)

Derivatives Not Designated as Hedging Instruments

Location of Gain

Amount of Gain (Loss) Recognized in Income on Derivative

(Loss) Recognized in Income on

Derivative

2013

2012

Foreign currency forward contracts

Other income (expense), net

264

(604

)

For the Nine Months Ended September 30,

(In thousands)

Derivatives Not Designated as Hedging Instruments

Location of Gain (Loss) Recognized in Income on

Amount of Gain (Loss) Recognized in Income on Derivative

Derivative

2013

2012

Foreign currency forward contracts

Other income (expense), net

1,991

(1,943

)

Comprehensive_Income_Tables

Comprehensive Income (Tables)	9 Months Ended
Comprehensive Income (Tables)	Sep. 30, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]	'
Schedule of changes in accumulated other comprehensive income by component	'
	The changes in Accumulated other comprehensive loss by component, net of tax, are as follows (in thousands):


		Foreign currency				Unrealized gain (loss) on available-for-sale securities			Unrealized gain (loss) on derivative instruments			Other comprehensive loss on pension liability			Total
		(In thousands)
	Balance at December 31, 2012	$	(3,024	)		$	2,426		$	(10	)	$	(7,097	)	$	(7,705	)
	Balance at December 31, 2012	$	(3,024	)		$	2,426		$	(10	)	$	(7,097	)	$	(7,705	)
	Other comprehensive income before reclassifications	4,099				(1,470		)	(1,399		)	(334		)	896
	Other comprehensive income before reclassifications	4,099				(1,470		)	(1,399		)	(334		)	896
	Amounts reclassified from accumulated other comprehensive loss	—				13			3,574			—			3,587
		—				13			3,574			—			3,587
	Net current period other comprehensive income	4,099				(1,457		)	2,175			(334		)	4,483
	Net current period other comprehensive income	4,099				(1,457		)	2,175			(334		)	4,483
	Balance at September 30, 2013	$	1,075			$	969		$	2,165		$	(7,431	)	$	(3,222	)
	Balance at September 30, 2013	$	1,075			$	969		$	2,165		$	(7,431	)	$	(3,222	)
Schedule of reclassification out of accumulated other comprehensive income	'
	Reclassifications out of accumulated other comprehensive loss are as follows (in thousands):


			For the Three Months Ended September 30,
			(In thousands)
	Details about accumulated other comprehensive loss components		Amount reclassified from accumulated other comprehensive loss, net of tax				Affected line item in the Condensed Consolidated Statements of Income
	Unrealized net losses on available-for-sale securities		$	(44	)		Other income (expense), net
	Unrealized net losses on cash flow hedges		(1,262		)		Operating expenses *
			$	(1,306	)


			For the Nine Months Ended September 30,
			(In thousands)
	Details about accumulated other comprehensive loss components		Amount reclassified from accumulated other comprehensive loss, net of tax				Affected line item in the Condensed Consolidated Statements of Income
	Unrealized net losses on available-for-sale securities		$	(13	)		Other income (expense), net
	Unrealized net losses on cash flow hedges		(3,574		)		Operating expenses *
			$	(3,587	)
	* Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Significant_Accounting_Policie2

Significant Accounting Policies (Narrative) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'
Net Revenues, licensing agreement with subscription bundle	'1 year	'	'
Allowance for estimated product returns	'	$1.60	$2.60
Online Service Agreements [Member]	'	'	'
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'
Revenue recognition, period for recognition, average	'12 months	'	'
Licence Update [Member]	'	'	'
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]	'	'	'
Revenue recognition, period for recognition, lower end of range	'12 months	'	'
Revenue recognition, period for recognition, higher end of range	'24 months	'	'

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator:	'	'	'	'
Net income	$76,730	$78,245	$200,879	$238,518
Denominator:	'	'	'	'
Denominator for basic earnings per share - weighted-average shares outstanding	187,459	186,864	187,120	186,326
Effect of dilutive employee stock awards	1,521	2,807	1,710	2,956
Denominator for diluted earnings per share - weighted-average shares outstanding	188,980	189,671	188,830	189,282
Basic earnings per share (in dollars per share)	$0.41	$0.42	$1.07	$1.28
Diluted earnings per share (in dollars per share)	$0.41	$0.41	$1.06	$1.26
Anti-dilutive weighted-average shares	3,286	3,355	3,851	3,336

Acquisitions_Narrative_Details

Acquisitions (Narrative) (Details) (USD $)

9 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Jan. 31, 2013

Sep. 30, 2013

Jul. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Apr. 30, 2012

Sep. 30, 2012

Apr. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Sep. 30, 2013

Mar. 31, 2012

Sep. 30, 2012

Infrastructure [Member]

Zenprise, Inc. [Member]

Bytemobile [Member]

Podio [Member]

Series of Individually Immaterial Business Acquisitions [Member]

Product Related Technologies [Member]

Other Intangible Assets [Member]

acquisitions

Product Related Technologies [Member]

Infrastructure [Member]

Q1 [Member]

Q2 [Member]

acquisitions

Finite-Lived Intangible Assets [Line Items]

Total consideration in business acquisition

$324,000,000

$399,500,000

$43,600,000

$5,300,000

$15,400,000

$24,600,000

Cash acquired in business combination

2,900,000

5,600,000

1,700,000

200,000

600,000

Transaction costs

600,000

2,100,000

500,000

200,000

400,000

500,000

Transaction costs expensed during period

100,000

2,100,000

500,000

200,000

400,000

Goodwill acquired

251,766,000

[1]

249,392,000

24,500,000

23,100,000

Identifiable intangible assets acquired

69,200,000

248,900,000

24,600,000

20,700,000

3,900,000

11,000,000

Stock units converted and assumed

127,668

13,487

66,459

13,481

Stock options converted and assumed

285,817

12,017

Net adjustment to preliminary purchase price allocation

2,700,000

4,100,000

Number of privately-held businesses acquired

Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High

$3,000,000

[1]

Amounts relate to Zenprise and 2013 Other Acquisition. See Note 4 for more information regarding the Companybs acquisitions.

Acquisitions_Estimated_Fair_Va

Acquisitions (Estimated Fair Values Of Assets Acquired And Liabilities Assumed) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Jan. 31, 2013	Jul. 31, 2012	Jan. 31, 2013	Jul. 31, 2012	Jan. 31, 2013	Jul. 31, 2012
In Thousands, unless otherwise specified			Zenprise, Inc. [Member]	Bytemobile [Member]	Minimum [Member]	Minimum [Member]	Maximum [Member]	Maximum [Member]
					Zenprise, Inc. [Member]	Bytemobile [Member]	Zenprise, Inc. [Member]	Bytemobile [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]	'	'	'	'	'	'	'	'
Current assets	'	'	$10,943	$57,796	'	'	'	'
Other assets	'	'	668	7,406	'	'	'	'
Property and equipment	'	'	431	2,484	'	'	'	'
Deferred tax assets, non-current	'	'	35,656	45,598	'	'	'	'
Intangible assets	'	'	69,200	248,900	'	'	'	'
Goodwill	1,766,902	1,518,219	249,392	221,251	'	'	'	'
Assets acquired	'	'	366,290	583,435	'	'	'	'
Current liabilities assumed	'	'	-8,475	-62,313	'	'	'	'
Long-term liabilities assumed	'	'	-3,107	-4,083	'	'	'	'
Deferred tax liabilities, non-current	'	'	-27,714	-111,905	'	'	'	'
Net assets acquired	'	'	$326,994	$405,134	'	'	'	'
Asset Life	'	'	'	'	'1 year	'1 year	'7 years	'9 years

Acquisitions_Schedule_Of_Ident

Acquisitions (Schedule Of Identifiable Intangible Assets Purchased) (Details) (USD $)	Jan. 31, 2013	Jan. 31, 2013	Jan. 31, 2013	Jan. 31, 2013	Jan. 31, 2013	Jul. 31, 2012	Jul. 31, 2012	Jul. 31, 2012	Jul. 31, 2012
In Thousands, unless otherwise specified	Zenprise, Inc. [Member]	Zenprise, Inc. [Member]	Zenprise, Inc. [Member]	Zenprise, Inc. [Member]	Zenprise, Inc. [Member]	Bytemobile [Member]	Bytemobile [Member]	Bytemobile [Member]	Bytemobile [Member]
		Trade Names [Member]	Noncompete Agreements [Member]	Customer Relationships [Member]	Core and Product Technologies [Member]		Trade Names [Member]	Customer Relationships [Member]	Core and Product Technologies [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'
Identifiable intangible assets acquired	$69,200	$2,400	$700	$18,300	$47,800	$248,900	$6,000	$141,500	$101,400
Asset Life	'	'3 years	'1 year	'7 years	'6 years	'	'6 years	'9 years	'4 years 9 months 18 days

Acquisitions_Pro_Forma_Details

Acquisitions (Pro- Forma) (Details) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition, Pro Forma Information [Abstract]	'	'	'	'
Revenues	$713,082	$644,121	$2,116,998	$1,851,618
Income from operations	87,173	69,483	218,735	208,150
Net income	$76,364	$70,039	$199,350	$214,784
Per share - basic (in dollars per share)	$0.41	$0.37	$1.07	$1.15
Per share - diluted (in dollars per share)	$0.40	$0.37	$1.06	$1.13

Investments_Narrative_Details

Investments (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
Investments (Narrative) (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Investments [Abstract]	'	'	'	'	'
Proceeds from available-for-sale of investments	$111,500,000	$188,300,000	$486,800,000	$891,000,000	'
Realized gains on the sales of available-for-sale investments	100,000	0	500,000	3,500,000	'
Realized losses on the sales of available-for-sale investments	100,000	200,000	400,000	800,000	'
Average remaining maturities for short-term available for sale investments	'	'	'6 months	'	'
Average remaining maturities for long-term available for sale investments	'	'	'3 years	'	'
Available-for-sale securities, carrying value	1,408,044,000	5,000,000	1,408,044,000	5,000,000	876,988,000
Available-for-sale securities, fair value	1,409,618,000	2,500,000	1,409,618,000	2,500,000	880,335,000
Other-than-temporary impairment charge included in other income	'	2,500,000	'	'	'
Gross unrealized loss on available-for-sale investments	1,011,000	'	1,011,000	'	192,000
Cost method investments	29,800,000	'	29,800,000	'	26,200,000
Cost method investments, recognized gain during period	$1,300,000	'	$2,300,000	'	'

Investments_Schedule_of_Availa

Investments (Schedule of Available-for-sale Securities) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Investment [Line Items]	'	'	'
Amortized Cost	$1,408,044	$876,988	$5,000
Gross Unrealized Gains	2,585	3,539	'
Gross Unrealized Losses	-1,011	-192	'
Fair Value	1,409,618	880,335	2,500
Agency Securities [Member]	'	'	'
Investment [Line Items]	'	'	'
Amortized Cost	527,430	400,365	'
Gross Unrealized Gains	1,440	2,347	'
Gross Unrealized Losses	-442	-5	'
Fair Value	528,428	402,707	'
Corporate Securities [Member]	'	'	'
Investment [Line Items]	'	'	'
Amortized Cost	679,443	404,546	'
Gross Unrealized Gains	785	947	'
Gross Unrealized Losses	-505	-171	'
Fair Value	679,723	405,322	'
Municipal Securities [Member]	'	'	'
Investment [Line Items]	'	'	'
Amortized Cost	72,951	32,214	'
Gross Unrealized Gains	65	114	'
Gross Unrealized Losses	-57	-15	'
Fair Value	72,959	32,313	'
Government Securities [Member]	'	'	'
Investment [Line Items]	'	'	'
Amortized Cost	128,220	39,863	'
Gross Unrealized Gains	295	131	'
Gross Unrealized Losses	-7	-1	'
Fair Value	$128,508	$39,993	'

Fair_Value_Measurements_Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Total assets	$1,661,208	$1,528,101
Liabilities, Fair Value Disclosure [Abstract]	'	'
Total liabilities	2,822	4,162
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Total assets	240,224	627,133
Liabilities, Fair Value Disclosure [Abstract]	'	'
Total liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Total assets	1,411,893	897,627
Liabilities, Fair Value Disclosure [Abstract]	'	'
Total liabilities	2,822	4,162
Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Total assets	9,091	3,341
Liabilities, Fair Value Disclosure [Abstract]	'	'
Total liabilities	0	0
Prepaid Expenses and Other Current Assets [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	5,117	4,157
Prepaid Expenses and Other Current Assets [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	0	0
Prepaid Expenses and Other Current Assets [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	5,117	4,157
Prepaid Expenses and Other Current Assets [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	0	0
Accrued Expenses And Other Current Liabilities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Liabilities, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	2,822	4,162
Accrued Expenses And Other Current Liabilities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Liabilities, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	0	0
Accrued Expenses And Other Current Liabilities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Liabilities, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	2,822	4,162
Accrued Expenses And Other Current Liabilities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Liabilities, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	0	0
Cash [Member] \| Cash and Cash Equivalents [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	189,065	503,614
Cash [Member] \| Cash and Cash Equivalents [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	189,065	503,614
Cash [Member] \| Cash and Cash Equivalents [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	0
Cash [Member] \| Cash and Cash Equivalents [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	0
Money Market Funds [Member] \| Cash and Cash Equivalents [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	51,159	123,519
Money Market Funds [Member] \| Cash and Cash Equivalents [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	51,159	123,519
Money Market Funds [Member] \| Cash and Cash Equivalents [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	0
Money Market Funds [Member] \| Cash and Cash Equivalents [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	0
Corporate Debt Securities [Member] \| Cash and Cash Equivalents [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	4,249	16,476
Corporate Debt Securities [Member] \| Cash and Cash Equivalents [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	0
Corporate Debt Securities [Member] \| Cash and Cash Equivalents [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	4,249	16,476
Corporate Debt Securities [Member] \| Cash and Cash Equivalents [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	0
Corporate Debt Securities [Member] \| Available-For-Sale Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	679,723	405,322
Corporate Debt Securities [Member] \| Available-For-Sale Securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Corporate Debt Securities [Member] \| Available-For-Sale Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	670,632	401,981
Corporate Debt Securities [Member] \| Available-For-Sale Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	9,091	3,341
Government Securities [Member] \| Available-For-Sale Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	128,508	39,993
Government Securities [Member] \| Available-For-Sale Securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Government Securities [Member] \| Available-For-Sale Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	128,508	39,993
Government Securities [Member] \| Available-For-Sale Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Municipal Securities [Member] \| Cash and Cash Equivalents [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	2,000	'
Municipal Securities [Member] \| Cash and Cash Equivalents [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	'
Municipal Securities [Member] \| Cash and Cash Equivalents [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	2,000	'
Municipal Securities [Member] \| Cash and Cash Equivalents [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	'
Municipal Securities [Member] \| Available-For-Sale Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	72,959	32,313
Municipal Securities [Member] \| Available-For-Sale Securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Municipal Securities [Member] \| Available-For-Sale Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	72,959	32,313
Municipal Securities [Member] \| Available-For-Sale Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Agency Securities [Member] \| Available-For-Sale Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	528,428	402,707
Agency Securities [Member] \| Available-For-Sale Securities [Member] \| Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Agency Securities [Member] \| Available-For-Sale Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	528,428	402,707
Agency Securities [Member] \| Available-For-Sale Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	$0	$0

Fair_Value_Measurements_Assets1

Fair Value Measurements (Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs) (Details) (Convertible Debt Securities [Member], Significant Unobservable Inputs (Level 3) [Member], USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Convertible Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'
Balance at December 31, 2012	$3,341
Purchases of Level 3 securities	6,000
Transfers out of Level 3	-250
Balance at September 30, 2013	$9,091

StockBased_Compensation_Narrat

Stock-Based Compensation (Narrative) (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Mar. 31, 2013

Mar. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

plan

Employee Stock Option [Member]

Market and Service Condition Stock Units [Member]

Non-Vested Stock Unit Awards [Member]

2005 Plan [Member]

2005 ESPP Plan [Member]

Vesting on first anniversary of date of grant [Member]

Vesting in equal monthly installments after first anniversary of date of grant [Member]

Annual vesting on each anniversary [Member]

Vesting on third anniversary [Member]

installment

Minimum [Member]

Maximum [Member]

frequency

Minimum [Member]

Maximum [Member]

Employee Stock Option [Member]

Non-Vested Stock Unit Awards [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of stock-based compensation plans offered

Shares authorized for issuance under 2005 Equity Incentive Plan

48,600,000

10,000,000

Ownership percentage of company where incentive stock options must be granted with an exercise price greater than fair market value

10.00%

Exercise price of incentive stock options granted to individuals owning 10% or more of the Company's common stock, as a percentage of fair market value of common stock on the date of grant

110.00%

Shares reserved for issuance under the 2005 Equity Incentive Plan

27,409,886

Shares available for grant under the 2005 Equity Incentive Plan

16,965,265

Employee Stock Purchase Plan, maximum purchase frequency per year

Employee Stock Purchase Plan, payment period

'6 months

Employee Stock Purchase Plan, minimum payroll deduction as a percentage of base pay

1.00%

10.00%

Employee Stock Purchase Plan, maximum number of shares per period that employees can purchase

12,000

Employee Stock Purchase Plan, purchase price as a percentage of fair market value

85.00%

Employee Stock Purchase Plan, employee disqualification, ownership percent of outstanding stock

5.00%

Employee Stock Purchase Plan, total shares issued under plan

2,991,834

stock-based compensation cost

$45,893,000

[1]

$40,103,000

[1]

$137,306,000

[1]

$108,922,000

[1]

$1,100,000

$3,700,000

$3,000,000

Stock options vesting life assumed

'5 years

Stock option vesting period

'3 years

Award vesting percentage

33.30%

2.78%

33.33%

100.00%

Vesting period of options from acquisitions

'3 years

The total intrinsic value of options exercised

28,700,000

39,800,000

70,200,000

117,000,000

Total unrecognized compensation cost

41,000,000

Total unrecognized compensation cost recognition period

'1 year 4 months 18 days

'2 years 0 months 8 days

Non-vested stock unit awards granted to senior level employees

399,029

418,809

Period to determine actual stock grant following end of performance period

'60 days

Performance period for grants

'3 years

Maximum percentage of market and service condition stock units that will ultimately vest

200.00%

Percentage that Company's return exceeds indexed return

40.00%

Percentage that Company's return underperforms index

20.00%

Percent of award issued if return is negative but index is met

75.00%

Number of shares represented by each non-vested stock unit upon vesting

The estimated fair value of each award

$89.93

$89.95

Stock-based compensation award vesting period, number of monthly installments

Share based awards granted and outstanding

4,440,852

Total unrecognized compensation cost related to stock-based compensation

$248,100,000

[1]

Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

StockBased_Compensation_Detail

Stock-Based Compensation (Detail Of The Total Stock-Based Compensation Recognized By Income Statement Classification) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'		'
Stock-based compensation expense	$45,893	[1]	$40,103	[1]	$137,306	[1]	$108,922	[1]
Cost of Services and Maintenance Revenues [Member]	'		'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'		'
Stock-based compensation expense	617		567		1,876		1,524
Research and Development [Member]	'		'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'		'
Stock-based compensation expense	15,831		14,523		47,987		39,722
Sales, Marketing and Services [Member]	'		'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'		'
Stock-based compensation expense	16,249		13,977		48,910		37,254
General and Administrative [Member]	'		'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'		'
Stock-based compensation expense	$13,196		$11,036		$38,533		$30,422

[1]	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

StockBased_Compensation_Assump

Stock-Based Compensation (Assumptions Used To Value Option Grants and Stock Awards (Details)

3 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Mar. 31, 2013

Mar. 31, 2012

Sep. 30, 2013

Mar. 31, 2013

Mar. 31, 2012

Mar. 31, 2013

Mar. 31, 2012

Employee Stock Option [Member]

Non-Vested Stock Unit Awards [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]

Expected volatility factor

43.00%

39.00%

38.00%

43.00%

16.00%

21.00%

42.00%

39.00%

Approximate risk free interest rate

0.52%

0.44%

0.52%

0.68%

0.33%

0.47%

Expected term (in years)

'3 years 10 months 28 days

'3 years 4 months 6 days

'3 years 10 months 28 days

'2 years 9 months

Expected dividend yield

0.00%

Goodwill_And_Other_Intangible_2

Goodwill And Other Intangible Assets (Schedule Of Change In Goodwill) (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013		Jul. 31, 2012
Goodwill [Roll Forward]	'	'		'
Balance at January 1, 2013	'	$1,518,219,000		'
Additions	'	251,766,000	[1]	'
Other	'	-3,083,000		'
Balance at September 30, 2013	1,766,902,000	1,766,902,000		'
Infrastructure [Member]	'	'		'
Goodwill [Roll Forward]	'	'		'
Balance at January 1, 2013	'	1,158,580,000		'
Additions	'	249,392,000		'
Other	'	-4,683,000	[2]	'
Balance at September 30, 2013	1,403,289,000	1,403,289,000		'
SaaS [Member]	'	'		'
Goodwill [Roll Forward]	'	'		'
Balance at January 1, 2013	'	359,639,000		'
Additions	'	2,374,000		'
Other	'	1,600,000	[3]	'
Balance at September 30, 2013	363,613,000	363,613,000		'
Bytemobile [Member]	'	'		'
Goodwill [Roll Forward]	'	'		'
Balance at January 1, 2013	'	'		221,251,000
Balance at September 30, 2013	'	'		221,251,000
Purchase accounting adjustments	2,700,000	4,100,000		'
Deferred tax assets and liabilities [Member] \| Bytemobile [Member]	'	'		'
Goodwill [Roll Forward]	'	'		'
Purchase accounting adjustments	'	10,000,000		'
Deferred revenue, current [Member] \| Bytemobile [Member]	'	'		'
Goodwill [Roll Forward]	'	'		'
Purchase accounting adjustments	'	$5,900,000		'

[1]	Amounts relate to Zenprise and 2013 Other Acquisition. See Note 4 for more information regarding the Companybs acquisitions.
[2]	Amount primarily relates to adjustments to the preliminary purchase price allocation associated with the Bytemobile acquisition, primarily related to adjustments of certain income tax assets and liabilities of $10.0 million, partially offset by a $5.9 million adjustment to current portion of deferred revenues.
[3]	Amount primarily relates to foreign currency translation.

Goodwill_And_Other_Intangible_3

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Statement [Line Items]	'		'		'		'		'
Gross carrying amount	$1,149,399,000		'		$1,149,399,000		'		$1,066,633,000
Accumulated amortization	615,403,000		'		615,403,000		'		510,428,000
Amortization expense	34,716,000	[1]	32,768,000	[1]	104,703,000	[1]	82,064,000	[1]	'
Product Related Intangible Assets [Member]	'		'		'		'		'
Statement [Line Items]	'		'		'		'		'
Gross carrying amount	675,659,000		'		675,659,000		'		620,032,000
Accumulated amortization	406,224,000		'		406,224,000		'		339,608,000
Amortization expense	24,300,000		22,900,000		73,400,000		56,600,000		'
Other Intangible Assets [Member]	'		'		'		'		'
Statement [Line Items]	'		'		'		'		'
Gross carrying amount	473,740,000		'		473,740,000		'		446,601,000
Accumulated amortization	209,179,000		'		209,179,000		'		170,820,000
Amortization expense	10,400,000		9,800,000		31,300,000		25,500,000		'
Cloud.Com [Member] \| Trade Names [Member]	'		'		'		'		'
Statement [Line Items]	'		'		'		'		'
Impairment of intangible assets	'		'		'		5,200,000		'
Finite-lived intangible assets, net	'		$0		'		$0		'
Minimum [Member]	'		'		'		'		'
Statement [Line Items]	'		'		'		'		'
Intangible asset life	'		'		'3 years		'		'
Maximum [Member]	'		'		'		'		'
Statement [Line Items]	'		'		'		'		'
Intangible asset life	'		'		'7 years		'		'
Maximum [Member] \| Patents [Member]	'		'		'		'		'
Statement [Line Items]	'		'		'		'		'
Intangible asset life	'		'		'10 years		'		'

[1]	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

Goodwill_And_Other_Intangible_4

Goodwill And Other Intangible Assets (Schedule Of Estimated Future Amortization Expense) (Details) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified	Sep. 30, 2013
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]	'
2013	$139,328
2014	131,359
2015	109,472
2016	87,205
2017	$59,513

Segment_Information_Net_Revenu

Segment Information (Net Revenues And Profit By Segment) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
	Sep. 30, 2013		Sep. 30, 2012		segment		Sep. 30, 2012
Segment Reporting Information [Line Items]	'		'		'		'
Number of reportable segments	'		'		2		'
Net revenues	$712,731		$641,422		$2,116,014		$1,846,127
Segment profit	87,367		82,415		219,863		245,357
Amortization of intangible assets	-34,716	[1]	-32,768	[1]	-104,703	[1]	-82,064	[1]
Net interest and other income	3,438	[1]	8,483	[1]	6,009	[1]	15,636	[1]
Stock-based compensation	-45,893	[1]	-40,103	[1]	-137,306	[1]	-108,922	[1]
Consolidated income before income taxes	90,805		90,898		225,872		260,993
Infrastructure [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	564,552		511,763		1,686,411		1,470,225
Segment profit	134,598		130,566		380,445		371,515
SaaS [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	148,179		129,659		429,603		375,902
Segment profit	$33,378		$24,720		$81,427		$64,828

[1]	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

Segment_Information_Revenues_B

Segment Information (Revenues By Product Grouping) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	$712,731		$641,422		$2,116,014		$1,846,127
Infrastructure [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	564,552		511,763		1,686,411		1,470,225
Infrastructure [Member] \| Mobile and Desktop revenues [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	380,878	[1]	351,607	[1]	1,121,102	[1]	1,037,144	[1]
Infrastructure [Member] \| Networking and Cloud Solutions revenues [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	146,474	[2]	127,327	[2]	458,753	[2]	340,319	[2]
Infrastructure [Member] \| Professional services [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	33,725	[3]	31,022	[3]	96,653	[3]	86,141	[3]
Infrastructure [Member] \| Other [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	3,475		1,807		9,903		6,621
SaaS [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	$148,179		$129,659		$429,603		$375,902

[1]	Mobile and Desktop revenues are primarily comprised of sales from the Companybs desktop virtualization products, XenDesktop and XenApp, and the Company's Mobility products, which include XenMobile and related license updates and maintenance and support.
[2]	Networking and Cloud revenues are primarily comprised of sales from the Companybs cloud networking products, which include NetScaler, CloudBridge and Bytemobile Smart Capacity, and the Companybs cloud platform products which include XenServer, CloudPlatform and CloudPortal and related license updates and maintenance and support.
[3]	Professional services revenues are primarily comprised of revenues from consulting services and product training and certification services.

Segment_Information_Revenues_B1

Segment Information (Revenues By Geographic Location) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Net revenues	$712,731	$641,422	$2,116,014	$1,846,127
Infrastructure [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Net revenues	564,552	511,763	1,686,411	1,470,225
Infrastructure [Member] \| Americas [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Net revenues	306,050	281,896	925,395	794,148
Infrastructure [Member] \| EMEA [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Net revenues	188,220	164,149	553,637	488,196
Infrastructure [Member] \| Asia-Pacific [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Net revenues	70,282	65,718	207,379	187,881
SaaS [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Net revenues	148,179	129,659	429,603	375,902
SaaS [Member] \| Americas [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Net revenues	124,044	109,935	360,954	319,946
SaaS [Member] \| EMEA [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Net revenues	18,522	15,941	53,266	45,974
SaaS [Member] \| Asia-Pacific [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Net revenues	$5,613	$3,783	$15,383	$9,982

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'	'
Cash flow hedge instrument term minimum (in months)	'12 months	'
Cumulative unrealized loss on cash flow derivative instruments in accumulated other comprehensive loss	$2,200,000	$0

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Instruments) (Details) (Foreign Exchange Contract [Member], Forward Contracts [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Designated as Hedging Instrument [Member] \| Prepaid Expenses and Other Current Assets [Member]	'	'
Asset Derivatives	'	'
Asset derivatives designated as hedging instruments	$4,686	$4,157
Designated as Hedging Instrument [Member] \| Accrued Expenses And Other Current Liabilities [Member]	'	'
Liability Derivatives	'	'
Liability derivatives designated as hedging instruments	2,392	4,162
Not Designated as Hedging Instrument [Member] \| Prepaid Expenses and Other Current Assets [Member]	'	'
Asset Derivatives	'	'
Asset derivatives designated as hedging instruments	431	448
Not Designated as Hedging Instrument [Member] \| Accrued Expenses And Other Current Liabilities [Member]	'	'
Liability Derivatives	'	'
Liability derivatives designated as hedging instruments	$430	$52

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Schedule Of Effect Of Derivative Instruments On Financial Performance) (Details) (Foreign Exchange Contract [Member], Forward Contracts [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Amount of Gain Recognized in Other Comprehensive Income (Effective Portion)	$5,158	$4,765	$2,175	$4,727
Operating Expense [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss (Effective Portion)	-1,262	-2,530	-3,574	-4,836
Not Designated as Hedging Instrument [Member] \| Other Income (Expense), net [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Amount of Gain (Loss) Recognized in Income on Derivative	$264	($604)	$1,991	($1,943)

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Schedule Of Net Notional Foreign Currency Forward Contracts Outstanding) (Details)

Sep. 30, 2013

In Thousands, unless otherwise specified

AUD

CAD

CHF

CNY

DKK

EUR (€)

GBP (£)

HKD

INR

JPY (¥)

NZD

SGD

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Net notional foreign currency forward contracts outstanding

2,963

5,700

20,082

72,950

3,600

€ 28,746

£ 32,600

51,106

852,150

¥ 434,700

100

11,500

Comprehensive_Income_Changes_i

Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'	'
Balance at December 31, 2012	'	'	($7,705)	'
Other comprehensive income before reclassifications	'	'	896	'
Amounts reclassified from accumulated other comprehensive loss	'	'	3,587	'
Other comprehensive income	13,753	11,721	4,483	1,428
Balance at September 30, 2013	-3,222	'	-3,222	'
Foreign currency [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'	'
Balance at December 31, 2012	'	'	-3,024	'
Other comprehensive income before reclassifications	'	'	4,099	'
Amounts reclassified from accumulated other comprehensive loss	'	'	0	'
Other comprehensive income	'	'	4,099	'
Balance at September 30, 2013	1,075	'	1,075	'
Unrealized gain (loss) on available-for-sale securities [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'	'
Balance at December 31, 2012	'	'	2,426	'
Other comprehensive income before reclassifications	'	'	-1,470	'
Amounts reclassified from accumulated other comprehensive loss	'	'	13	'
Other comprehensive income	'	'	-1,457	'
Balance at September 30, 2013	969	'	969	'
Unrealized (loss) gain on derivative instruments [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'	'
Balance at December 31, 2012	'	'	-10	'
Other comprehensive income before reclassifications	'	'	-1,399	'
Amounts reclassified from accumulated other comprehensive loss	'	'	3,574	'
Other comprehensive income	'	'	2,175	'
Balance at September 30, 2013	2,165	'	2,165	'
Other comprehensive loss on pension liability [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'	'
Balance at December 31, 2012	'	'	-7,097	'
Other comprehensive income before reclassifications	'	'	-334	'
Amounts reclassified from accumulated other comprehensive loss	'	'	0	'
Other comprehensive income	'	'	-334	'
Balance at September 30, 2013	($7,431)	'	($7,431)	'

Comprehensive_Income_Reclassif

Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Loss) (Details) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Unrealized net losses on available-for-sale securities	$1,359		$6,424	($53)		$7,671
Unrealized net losses on cash flow hedges	-501,431		-452,939	-1,530,064		-1,314,001
Net income	76,730		78,245	200,879		238,518
Reclassification out of Accumulated Other Comprehensive Income [Member]	'		'	'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Net income	-1,306		'	-3,587		'
Unrealized net gains on available-for-sale securities [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]	'		'	'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Unrealized net losses on available-for-sale securities	-44		'	-13		'
Unrealized net losses on cash flow hedges [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]	'		'	'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Unrealized net losses on cash flow hedges	($1,262)	[1]	'	($3,574)	[1]	'

[1]	* Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
Income Taxes (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]	'	'	'	'	'
Net unrecognized tax benefit	$57,600,000	'	$57,600,000	'	$43,900,000
Income tax interest and penalties accrued	0	'	0	'	'
Deferred tax assets	$151,000,000	'	$151,000,000	'	'
Effective tax rate	15.50%	13.90%	11.10%	8.60%	'
U.S. federal statutory rate	'	'	35.00%	'	'

Treasury_Stock_Details

Treasury Stock (Details) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Oct. 31, 2013
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]	'	'	'	'	'
Stock repurchase program, authorized amount	'	'	$3,900,000,000	'	$500,000,000
Available to repurchase common stock	'	'	179,300,000	'	'
Amount expended on share repurchases in open market transactions	55,300,000	75,000,000	156,300,000	175,000,000	'
Number of shares repurchased	764,800	983,200	2,240,050	2,361,800	'
Average per share price on share repurchases in open market transactions	$72.30	$76.24	$69.79	$74.08	'
Number of shares withheld to satisfy minimum tax withholding obligations	43,035	31,733	389,369	227,604	'
Cash paid for tax withholding on vested stock awards	$2,900,000	$2,500,000	$27,708,000	$17,524,000	'

Commitments_And_Contingencies_

Commitments And Contingencies (Details) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Sep. 17, 2012
Loss Contingency, Information about Litigation Matters [Abstract]	'
Final damages awarded, confirmed by court	$10
Enhanced damages awarded	5
Prejudgment interest on damages award	$5