Cognizant Technology Solutions (CTSH) 10-K 27 Feb 15 2014 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 19, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	CTSH
Entity Registrant Name	COGNIZANT TECHNOLOGY SOLUTIONS CORP
Entity Central Index Key	1058290
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		609,616,575
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$29,556,044,386
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No

Consolidated_Statements_Of_Fin

Consolidated Statements Of Financial Position (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Cash and cash equivalents	$2,010,149	$2,213,006
Short-term investments	1,764,577	1,534,467
Trade accounts receivable, net of allowances of $36,925 and $26,824, respectively	1,968,680	1,648,785
Unbilled accounts receivable	324,584	226,487
Deferred income tax assets, net	329,694	256,230
Other current assets	352,613	268,907
Total current assets	6,750,297	6,147,882
Property and equipment, net of accumulated depreciation of $852,124 and $719,336, respectively	1,247,205	1,081,164
Goodwill	2,413,564	444,236
Intangible assets, net	953,749	131,274
Deferred income tax assets, net	144,438	147,149
Other noncurrent assets	209,663	183,013
Total assets	11,718,916	8,134,718
Liabilities and Stockholders' Equity
Accounts payable	145,687	113,394
Deferred revenue	224,114	182,893
Short-term debt	700,002	0
Accrued Expenses And Other Current Liabilities	1,522,291	1,478,221
Total current liabilities	2,592,094	1,774,508
Deferred revenue, noncurrent	80,956	0
Deferred income tax liabilities, net	251,724	21,170
Long-term debt	937,500	0
Other noncurrent liabilities	116,424	203,249
Total liabilities	3,978,698	1,998,927
Commitments and contingencies (See Note 14)
Stockholders' Equity:
Preferred stock, $0.10 par value, 15,000 shares authorized, none issued	0	0
Class A common stock, $0.01 par value, 1,000,000 shares authorized, 609,398 and 607,729 shares issued and outstanding at December 31, 2014 and December 31, 2013, respectively	6,094	6,077
Additional paid-in capital	555,558	543,606
Retained earnings	7,301,634	5,862,367
Accumulated other comprehensive income (loss)	-123,068	-276,259
Total stockholders’ equity	7,740,218	6,135,791
Total liabilities and stockholders’ equity	$11,718,916	$8,134,718

Condensed_Consolidated_Stateme

Condensed Consolidated Statements Of Financial Position (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances	$36,925	$26,824
Property and equipment, accumulated depreciation	$852,124	$719,336
Preferred stock, par value	$0.10	$0.10
Preferred stock, shares authorized	15,000,000	15,000,000
Preferred stock, issued	0	0
Class A common stock, par value	$0.01	$0.01
Class A common stock, shares authorized	1,000,000,000	1,000,000,000
Class A common stock, shares issued	609,398,000	607,729,000
Class A common stock, shares outstanding	609,398,000	607,729,000

Consolidated_Statements_Of_Ope

Consolidated Statements Of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues	$10,262,681	$8,843,189	$7,346,472
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	6,141,118	5,265,469	4,278,241
Selling, general and administrative expenses	2,037,021	1,727,609	1,557,646
Depreciation and amortization expense	199,664	172,201	149,089
Income from operations	1,884,878	1,677,910	1,361,496
Other income (expense), net:
Interest income	62,444	48,896	44,514
Interest expense	-2,468	0	0
Foreign currency exchange gains (losses), net	-20,376	-41,130	-20,015
Other, net	-447	2,241	1,601
Total other income (expense), net	39,153	10,007	26,100
Income before provision for income taxes	1,924,031	1,687,917	1,387,596
Provision for income taxes	484,764	459,339	336,333
Net income	$1,439,267	$1,228,578	$1,051,263
Basic earnings per share	$2.37	$2.03	$1.74
Diluted earnings per share	$2.35	$2.02	$1.72
Weighted average number of common shares outstanding—Basic	608,126	604,015	602,582
Dilutive effect of shares issuable under stock-based compensation plans	4,363	5,647	9,140
Weighted average number of common shares outstanding—Diluted	612,489	609,662	611,722

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$1,439,267	$1,228,578	$1,051,263
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	-58,845	12,461	15,133
Change in unrealized losses on cash flow hedges, net of taxes	213,251	-47,183	70,229
Change in unrealized losses and gains on available-for-sale securities, net of taxes	-1,215	-1,854	349
Other comprehensive income (loss)	153,191	-36,576	85,711
Comprehensive income	$1,592,458	$1,192,002	$1,136,974

Consolidated_Statements_Of_Sto

Consolidated Statements Of Stockholders' Equity (USD $)	Total	Class A Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
In Thousands, except Share data, unless otherwise specified
Beginning balance at Dec. 31, 2011	$3,952,886	$6,062	$689,692	$3,582,526	($325,394)
Beginning balance, shares at Dec. 31, 2011		606,212,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,051,263			1,051,263
Other comprehensive (loss) income	85,711				85,711
Common stock issued, stock based compensation plans	129,485	144	129,341
Common stock issued, stock based compensation plans, shares		14,352,000
Tax benefit, stock-based compensation plans	48,528		48,528
Stock-based compensation expense	107,355		107,355
Repurchases of common stock	-520,845	-172	-520,673
Repurchases of common stock, shares		-17,204,000
Ending balance at Dec. 31, 2012	4,854,383	6,034	454,243	4,633,789	-239,683
Ending balance, shares at Dec. 31, 2012		603,360,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,228,578			1,228,578
Other comprehensive (loss) income	-36,576				-36,576
Common stock issued, stock based compensation plans	117,556	96	117,460
Common stock issued, stock based compensation plans, shares		9,622,000
Tax benefit, stock-based compensation plans	32,054		32,054
Stock-based compensation expense	118,800		118,800
Repurchases of common stock	-179,004	-53	-178,951
Repurchases of common stock, shares		-5,253,000
Ending balance at Dec. 31, 2013	6,135,791	6,077	543,606	5,862,367	-276,259
Ending balance, shares at Dec. 31, 2013	607,729,000	607,729,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,439,267			1,439,267
Other comprehensive (loss) income	153,191				153,191
Common stock issued, stock based compensation plans	101,455	67	101,388
Common stock issued, stock based compensation plans, shares		6,677,000
Tax benefit, stock-based compensation plans	24,006		24,006
Stock-based compensation expense	134,825		134,825
Repurchases of common stock	-248,317	-50	-248,267
Repurchases of common stock, shares		-5,008,000
Ending balance at Dec. 31, 2014	$7,740,218	$6,094	$555,558	$7,301,634	($123,068)
Ending balance, shares at Dec. 31, 2014	609,398,000	609,398,000

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$1,439,267	$1,228,578	$1,051,263
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	208,067	179,930	156,588
Provision for doubtful accounts	4,675	3,571	5,076
Deferred income taxes	-99,580	-88,194	-117,908
Stock-based compensation expense	134,825	118,800	107,355
Excess tax benefits on stock-based compensation plans	-23,549	-30,581	-48,373
Other	30,275	52,544	2,499
Changes in assets and liabilities:
Trade accounts receivable	-259,332	-258,469	-158,603
Other current assets	-118,592	-74,668	-29,833
Other noncurrent assets	19,121	-24,338	-36,692
Accounts payable	25,681	-12,123	32,773
Other current and noncurrent liabilities	112,152	328,726	208,438
Net cash provided by operating activities	1,473,010	1,423,776	1,172,583
Cash flows from investing activities:
Purchases of property and equipment	-212,203	-261,626	-334,465
Purchases of investments	-2,497,299	-1,848,744	-1,428,508
Proceeds from maturity or sale of investments	2,240,245	1,573,412	1,252,821
Business combinations, net of cash acquired	-2,691,437	-193,805	-59,894
Net cash (used in) investing activities	-3,160,694	-730,763	-570,046
Cash flows from financing activities:
Issuance of common stock under stock-based compensation plans	101,455	117,556	129,484
Excess tax benefits on stock-based compensation plans	23,549	30,581	48,373
Repurchases of common stock	-248,317	-179,004	-520,845
Proceeds from debt	1,650,000	0	0
Repayments of debt	-14,184	0	0
Debt issuance costs	-9,093	0	0
Net cash provided by (used in) financing activities	1,503,410	-30,867	-342,988
Effect of exchange rate changes on cash and cash equivalents	-18,583	-19,217	-378
(Decrease) increase in cash and cash equivalents	-202,857	642,929	259,171
Cash and cash equivalents, beginning of year	2,213,006	1,570,077	1,310,906
Cash and cash equivalents, end of period	2,010,149	2,213,006	1,570,077
Supplemental information:
Cash paid for income taxes during the year	558,554	480,980	402,098
Cash interest paid during the year	$105	$0	$0

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies
	The terms “Cognizant,” “we,” “our,” “us” and “the Company” refer to Cognizant Technology Solutions Corporation and its subsidiaries unless the context indicates otherwise.
	Description of Business. We are a leading provider of information technology (IT), consulting and business process services, dedicated to helping the world’s leading companies innovate and build stronger businesses. Our clients engage us to help them operate more efficiently, provide solutions to critical business and technology problems, and help them drive technology-based innovation and growth. Our core competencies include: Business, Process, Operations and IT Consulting, Application Development and Systems Integration, Enterprise Information Management, or EIM, Application Testing, Application Maintenance, IT Infrastructure Services, or IT IS and Business Process Services, or BPS. We tailor our services to specific industries and utilize an integrated global delivery model. This seamless global sourcing model combines industry-specific expertise, client service teams based on-site at the client locations and delivery teams located at dedicated near-shore and offshore global delivery centers.
	Basis of Presentation and Principles of Consolidation. The consolidated financial statements are presented in accordance with generally accepted accounting principles in the United States of America, or U.S. GAAP, and reflect the consolidated financial position, results of operations, comprehensive income and cash flows of our consolidated subsidiaries for all periods presented. All intercompany balances and transactions have been eliminated in consolidation.
	Stock Split. On February 4, 2014, our Board of Directors declared a two-for-one stock split of our Class A common stock in the form of a 100% stock dividend, which was paid on March 7, 2014 to stockholders of record as of February 21, 2014. The stock split has been reflected in the accompanying consolidated financial statements, and all applicable references as to the number of outstanding common shares and per share information herein, except par values, have been retroactively adjusted to reflect the stock split as if it occurred at the beginning of the earliest period presented. In addition, our stockholders’ equity accounts were restated to reflect the reclassification of an amount equal to the par value of the increase in issued common shares from the additional paid-in-capital account to the common stock accounts.
	Cash and Cash Equivalents and Investments. Cash and cash equivalents consist of all cash balances, including money market funds and liquid instruments. Liquid instruments are classified as cash equivalents when their maturities at the date of purchase are three months or less and as short-term investments when their maturities at the date of purchase are greater than three months.
	We determine the appropriate classification of our investments in marketable securities at the date of purchase and reevaluate such designation at each balance sheet date. We have classified and accounted for our marketable securities as available-for-sale. After consideration of our risk versus reward objectives, as well as our liquidity requirements, we may sell these securities prior to their stated maturities. As we view these marketable securities as available to support current operations, we classify such securities with maturities at the date of purchase beyond twelve months as short-term investments because such investments represent an investment in cash that is available for current operations.
	Available-for-sale securities are reported at fair value with changes in unrealized gains and losses recorded as a separate component of accumulated other comprehensive income (loss) until realized. We determine the cost of the securities sold based on the specific identification method. Time deposits with financial institutions are valued at cost, which approximates fair value.
	Interest and amortization of premiums and discounts for debt securities are included in interest income. We also evaluate our available-for-sale investments periodically for possible other-than-temporary impairment by reviewing factors such as the length of time and extent to which fair value has been below cost basis, the financial condition of the issuer, whether we intend to sell the security and whether it is more likely than not that we will be required to sell the security prior to recovery of its amortized cost basis. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is generally recorded to income and a new cost basis in the investment is established.
	Allowance for Doubtful Accounts. We maintain an allowance for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. The allowance for doubtful accounts is determined by evaluating the relative credit-worthiness of each customer, historical collections experience and other information, including the aging of the receivables. We evaluate the collectibility of our accounts receivable on an on-going basis and write-off accounts when they are deemed to be uncollectible.
	Unbilled Accounts Receivable. Unbilled accounts receivable represent revenues on contracts to be billed, in subsequent periods, as per the terms of the related contracts.
	Short-term Financial Assets and Liabilities. Cash and cash equivalents, trade receivables, accounts payable and other accrued liabilities are short-term in nature and, accordingly, their carrying values approximate fair value.
	Property and Equipment. Property and equipment are stated at cost, net of accumulated depreciation. Depreciation is calculated on the straight-line basis over the estimated useful lives of the assets. Leasehold improvements are amortized on a straight-line basis over the shorter of the term of the lease or the estimated useful life of the improvement. In India, leasehold land is leased by us from the government of India with lease terms ranging up to 99 years. Lease payments are made at the inception of the lease agreement and amortized over the lease term. Maintenance and repairs are expensed as incurred, while renewals and betterments are capitalized. Deposits paid towards acquisition of long-lived assets and the cost of assets not put in use before the balance sheet date are disclosed under the caption “capital work-in-progress” in Note 4.
	Internal Use Software. We capitalize certain costs that are incurred to purchase, develop and implement internal-use software during the application development phase, which primarily includes coding and testing and certain data conversion activities. Capitalized costs are amortized on a straight-line basis over the useful life of the software. Costs incurred performing activities associated with the preliminary project phases and post-implementation phases are expensed as incurred.
	Business Combinations. We account for business combinations using the acquisition method, which requires the identification of the acquirer, the determination of the acquisition date, and the allocation of the purchase price paid by the acquirer to the identifiable tangible and intangible assets acquired, the liabilities assumed, and any noncontrolling interest in the acquiree at their acquisition date fair values. Goodwill represents the excess of the purchase price over the fair value of net assets acquired, including the amount assigned to identifiable intangible assets. Identifiable intangible assets with finite lives are amortized over their useful lives. Acquisition-related costs are expensed in the periods in which the costs are incurred. The results of operations of acquired businesses are included in our consolidated financial statements from the acquisition date.
	Long-lived Assets and Finite-lived Intangibles. We review long-lived assets and certain finite-lived identifiable intangibles for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. We recognize an impairment loss when the sum of undiscounted expected future cash flows is less than the carrying amount of such assets. The impairment loss would equal the amount by which the carrying amount of the asset exceeds the fair value of the asset. Other intangibles consist primarily of customer relationships and developed technology, which are being amortized on a straight-line basis over their estimated useful lives.
	Goodwill and Indefinite-lived Intangibles. We evaluate goodwill and indefinite-lived intangible assets, at the reporting unit level, for impairment at least annually, or as circumstances warrant. If an impairment is indicated, a write down to fair value (normally measured by discounting estimated future cash flows) is recorded.
	Stock Repurchase Program. Our existing stock repurchase program, as amended and approved by our Board of Directors, allows for the repurchase of $2,000,000 of our outstanding shares of Class A common stock and expires on December 31, 2015. Through December 31, 2014, we completed stock repurchases of 35,242,550 shares for $1,186,369, inclusive of fees and expenses, under this program. Additional stock repurchases were made in connection with our stock-based compensation plans, whereby Company shares were tendered by employees for payment of applicable statutory tax withholdings. During 2014, 2013, and 2012 such repurchases totaled 1,207,595, 1,165,872 and 1,065,184 shares, respectively, at an aggregate cost of $60,075, $47,442 and $34,925, respectively. At the time of repurchase, shares are returned to the status of authorized and unissued shares. We account for the repurchases as constructively retired and record such repurchases as a reduction of Class A common stock and additional paid-in capital.
	Revenue Recognition. Revenues related to time-and-material contracts are recognized as the service is performed and amounts are earned. Revenues from transaction-priced contracts are recognized as transactions are processed and amounts are earned. Revenues related to fixed-price contracts for highly complex application development and systems integration services are recognized as the service is performed using the percentage of completion method of accounting, under which the total value of revenue is recognized on the basis of the percentage that each contract’s total labor cost to date bears to the total expected labor costs (cost to cost method). Revenues related to fixed price outsourcing services are recognized on a straight-line basis unless revenues are earned and obligations are fulfilled in a different pattern. Revenues related to fixed-price contracts for consulting or other IT services are recognized as services are performed on a proportional performance basis based upon the level of effort.
	For all services, revenue is earned and recognized only when all of the following criteria are met: evidence of an arrangement is obtained, the price is fixed or determinable, the services have been rendered and collectibility is reasonably assured. Contingent or incentive revenues are recognized when the contingency is satisfied and we conclude the amounts are earned. Volume discounts are recorded as a reduction of revenue over the contract period as services are provided. Revenues also include the reimbursement of out-of-pocket expenses.
	Costs to deliver services are expensed to cost of revenues as incurred with the exception of specific costs directly related to transition or set-up activities for outsourcing contracts. Transition costs are deferred and expensed ratably over the period of service. Generally, deferred amounts are protected in the event of early termination of the contract and are monitored regularly for impairment. Impairment losses are recorded when projected remaining undiscounted operating cash flows of the related contract are not sufficient to recover the carrying amount of the contract assets. Deferred transition costs were approximately $98,172 and $80,254 as of December 31, 2014 and 2013, respectively, and are included in other noncurrent assets in our consolidated statements of financial position. Costs related to warranty provisions are accrued at the time the related revenues are recorded.
	We may enter into arrangements that consist of multiple elements. Such arrangements may include any combination of our consulting and technology services and outsourcing services. For arrangements with multiple deliverables, we evaluate at the inception of each new arrangement all deliverables to determine whether they represent separate units of accounting. For arrangements with multiple units of accounting, other than arrangements that contain software licenses and software-related services, we allocate consideration among the units of accounting, where separable, based on their relative selling price. Relative selling price is determined based on vendor-specific objective evidence, or VSOE, if it exists. Otherwise, third-party evidence of selling price is used, when it is available, and in circumstances when neither VSOE nor third-party evidence of selling price is available, management’s best estimate of selling price is used. Revenue is recognized for each unit of accounting based on our revenue recognition policy described above.
	Fixed-price contracts are generally cancelable subject to a specified notice period. All services provided by us through the date of cancellation are due and payable under the contract terms. We issue invoices related to fixed-price contracts based upon achievement of milestones during a project or other contractual terms. Differences between the timing of billing, based on contract milestones or other contractual terms, and the recognition of revenue are recognized as either unbilled receivables or deferred revenue. Estimates of certain fixed-price contracts are subject to adjustment as a project progresses to reflect changes in expected completion costs or efforts. The cumulative impact of any revision in estimates is reflected in the financial reporting period in which the change in estimate becomes known and any anticipated losses on contracts are recognized immediately.
	We also generate product revenue from licensing our software. For perpetual software license arrangements that do not require significant modification or customization of the underlying software, revenue is recognized when the software is delivered and all other software revenue recognition criteria are met. For software license arrangements that require significant functionality enhancements or modification of the software, revenue for the software license and those services is recognized as those services are performed. For software license arrangements that include a right to use the product for a defined period of time, we recognize revenue ratably over the term of the license.
	We may enter into arrangements with customers that purchase both software licenses and software-related services from us at the same time, or within close proximity of one another (referred to as software-related multiple-element arrangements). Such software related multiple-element arrangements may include software licenses, software license updates, product support contracts and other software-related services. For those software related multiple-element arrangements, we apply the residual method to determine the amount of software license revenue. Under the residual method, if VSOE of fair value exists for undelivered elements in a multiple-element arrangement, such fair value of the undelivered elements is deferred with the remaining portion of the arrangement consideration generally recognized upon delivery of the software license. For arrangements in which VSOE of fair value does not exist for each software-related undelivered element, revenue for the software license is deferred and not recognized until VSOE of fair value is available for the undelivered element or delivery of each element has occurred. If the only undelivered element is a service, revenue from the delivered element is recognized over the service period.
	We also enter into multiple-element arrangements that may include a combination of software licenses and various software-related and non-software-related services. In such arrangements, we first allocate the total arrangement consideration, based on relative selling prices, between the software group of elements and the non-software group of elements. We then further allocate consideration within the software group to the respective elements within that group following the software-related multiple-element arrangements policies described above. For the non-software group of elements, we further allocate consideration to the respective elements based on relative selling prices. After the arrangement consideration has been allocated to the individual elements, we account for each respective element in the arrangement as described above.
	Stock-Based Compensation. Stock-based compensation expense for awards of equity instruments to employees and non-employee directors is determined based on the grant-date fair value of those awards. We recognize these compensation costs net of an estimated forfeiture rate over the requisite service period of the award. Forfeitures are estimated on the date of grant and revised if actual or expected forfeiture activity differs materially from original estimates.
	Foreign Currency. The assets and liabilities of our foreign subsidiaries whose functional currency is not the U.S. dollar are translated into U.S. dollars from local currencies at current exchange rates and revenues and expenses are translated from local currencies at average monthly exchange rates. The resulting translation adjustments are recorded in accumulated other comprehensive income (loss) on the accompanying consolidated statements of financial position.
	Foreign currency transactions and balances are those that are denominated in a currency other than the subsidiary’s functional currency. The U.S. dollar is the functional currency for certain foreign subsidiaries who conduct business predominantly in U.S. dollars. For these subsidiaries, transactions and balances denominated in the local currency are foreign currency transactions. Foreign currency transactions and balances related to non-monetary assets and liabilities are remeasured to the functional currency of the subsidiary at historical exchange rates while monetary assets and liabilities are remeasured to the functional currency of the subsidiary at current exchange rates. Foreign currency exchange gains or losses from remeasurement are included in income. Net foreign currency exchange (losses) reported on our consolidated statement of operations are inclusive of gains or losses on our undesignated foreign currency hedges.
	Derivative Financial Instruments. Derivative financial instruments are accounted for in accordance with the authoritative guidance which requires that each derivative instrument be recorded on the balance sheet as either an asset or liability measured at its fair value as of the reporting date. Our derivative financial instruments consist of foreign exchange forward contracts. For derivative financial instruments to qualify for hedge accounting, the following criteria must be met: (1) the hedging instrument must be designated as a hedge; (2) the hedged exposure must be specifically identifiable and expose us to risk; and (3) it is expected that a change in fair value of the derivative financial instrument and an opposite change in the fair value of the hedged exposure will have a high degree of correlation. The authoritative guidance also requires that changes in our derivatives’ fair values be recognized in income unless specific hedge accounting and documentation criteria are met (i.e., the instruments are accounted for as hedges). For items to which hedge accounting is applied, we record the effective portion of our derivative financial instruments that are designated as cash flow hedges in accumulated other comprehensive income (loss) in the accompanying consolidated statements of financial position. Any ineffectiveness or excluded portion of a designated cash flow hedge is recognized in income.
	Use of Estimates. The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, including the recoverability of tangible and intangible assets, disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the period. On an on-going basis, management reevaluates these estimates. The most significant estimates relate to the recognition of revenue and profits based on the percentage of completion method of accounting for certain fixed-bid contracts, the allowance for doubtful accounts, income taxes, valuation of goodwill, intangible assets and other long-lived assets, valuation of investments and derivative financial instruments, assumptions used in valuing stock-based compensation arrangements, contingencies and litigation. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. The actual amounts may vary from the estimates used in the preparation of the accompanying consolidated financial statements.
	Risks and Uncertainties. The majority of our development and delivery centers and employees are located in India. As a result, we may be subject to certain risks associated with international operations, including risks associated with foreign currency exchange rate fluctuations and risks associated with the application and imposition of protective legislation and regulations relating to import and export or otherwise resulting from foreign policy or the variability of foreign economic or political conditions. Additional risks associated with international operations include difficulties in enforcing intellectual property rights, the burdens of complying with a wide variety of foreign laws, potential geo-political and other risks associated with terrorist activities and local or cross border conflicts and potentially adverse tax consequences, tariffs, quotas and other barriers.
	Concentration of Credit Risk. Financial instruments that potentially subject us to significant concentrations of credit risk consist primarily of cash and cash equivalents, time deposits, investments in securities, derivative financial instruments and trade accounts receivable. We maintain our cash and cash equivalents and investments with high credit quality financial institutions, invest in investment-grade debt securities and limit the amount of credit exposure to any one commercial issuer. Trade accounts receivable are dispersed across many customers operating in different industries; therefore, concentration of credit risk is limited.
	Income Taxes. We provide for income taxes utilizing the asset and liability method of accounting. Under this method, deferred income taxes are recorded to reflect the tax consequences in future years of differences between the tax basis of assets and liabilities and their financial reporting amounts at each balance sheet date, based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. If it is determined that it is more likely than not that future tax benefits associated with a deferred income tax asset will not be realized, a valuation allowance is provided. The effect on deferred income tax assets and liabilities of a change in the tax rates is recognized in income in the period that includes the enactment date. Tax benefits earned on exercise of employee stock options in excess of compensation charged to income are credited to additional paid-in capital. Our provision for income taxes also includes the impact of provisions established for uncertain income tax positions, as well as the related interest.
	Earnings Per Share, or EPS. Basic EPS excludes dilution and is computed by dividing earnings available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted EPS includes all potential dilutive common stock in the weighted average shares outstanding. For purposes of computing diluted earnings per share for the years ended December 31, 2014, 2013 and 2012, respectively, 4,363,000, 5,647,000, and 9,140,000 shares were assumed to have been outstanding related to common share equivalents. We exclude options with exercise prices that are greater than the average market price for the period from the calculation of diluted EPS because their effect would be anti-dilutive. We excluded 4,300 shares in 2014, 6,800 shares in 2013, and 39,000 in 2012 from our diluted EPS calculation. Also, in accordance with the authoritative guidance, we excluded from the calculation of diluted EPS an additional 78,800 shares in 2014, 97,800 shares in 2013, and 158,600 shares in 2012, related to stock based awards whose combined exercise price, unamortized fair value and excess tax benefits were greater in each of those periods than the average market price of our common stock because their effect would be anti-dilutive. We include performance stock unit awards in the dilutive potential common shares when they become contingently issuable per the authoritative guidance and exclude the awards when they are not contingently issuable.
	Recently Adopted Accounting Pronouncement.
	In July 2013, the Financial Accounting Standards Board, or FASB, issued new guidance which requires the netting of any unrecognized tax benefits against all available same-jurisdiction deferred income tax carryforward assets that would apply if the uncertain tax positions were settled. We adopted this standard on January 1, 2014. As of December 31, 2014, we netted an unrecognized tax benefit of $94,784 against same-jurisdiction noncurrent deferred income tax assets. In our December 31, 2013 consolidated statement of financial position, we reclassified $74,196 from "other non-current liabilities" to non-current "deferred income tax assets, net" to conform to current period's presentation. The adoption of this standard had no effect on our consolidated results of operations or stockholder's equity.
	New Accounting Pronouncement.
	In May 2014, the FASB issued a standard on revenue from contracts with customers. The new standard sets forth a single comprehensive model for recognizing and reporting revenue. The standard also requires additional financial statement disclosures that will enable users to understand the nature, amount, timing and uncertainty of revenue and cash flows relating to customer contracts. The new standard will be effective for periods beginning on or after January 1, 2017. Early adoption is not permitted. The standard allows for two methods of adoption: the full retrospective adoption, which requires the standard to be applied to each prior period presented, or the modified retrospective adoption, which requires the cumulative effect of adoption to be recognized as an adjustment to opening retained earnings in the period of adoption. We are currently evaluating the effect the new standard will have on our consolidated financial statements and related disclosures.

Business_Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Business Combinations	Business Combinations
	TriZetto Acquisition:
	On November 20, 2014, we completed the acquisition of TZ US Parent, Inc. ("TriZetto"), a private U.S. healthcare information technology company for an aggregate purchase price, after giving effect to various purchase price adjustments, of approximately $2,627,830 (net of cash acquired of $170,510) ("the TriZetto Acquisition"). Such purchase price is subject to an additional adjustment upon finalization of the purchase price calculations with the seller, including an adjustment related to net working capital. The TriZetto acquisition positions Cognizant to better serve a wider cross-section of clients with an integrated solution set, combining technology with our healthcare services business. In connection with the acquisition of TriZetto, we entered into a credit agreement (“Credit Agreement”) with a commercial bank syndicate providing for a $1,000,000 unsecured term loan (“Term Loan”) and a $750,000 unsecured revolving credit facility (“Revolving Facility”). The Term Loan was used to pay a portion of the cash consideration in connection with the TriZetto Acquisition.
	Our preliminary allocation of purchase price as of November 20, 2014 (the closing date of the TriZetto Acquisition) to the fair value of assets acquired and liabilities assumed is as follows:
			Amount
	Cash		$	170,510
	Trade accounts receivable		83,052
	Unbilled accounts receivable		32,463
	Other current assets		11,218
	Property and equipment		124,050
	Identifiable intangible assets		849,000
	Other noncurrent assets		14,782
	Accounts payable		(12,395		)
	Deferred revenue		(48,281		)
	Accrued expenses and other current liabilities		(118,311		)
	Other noncurrent liabilities		(54,833		)
	Deferred income tax liabilities, net		(209,031		)
	Goodwill		1,956,116
	Total purchase price		$	2,798,340
	We allocated the purchase price to the identifiable assets acquired and liabilities assumed based upon their estimated fair values. The excess of purchase price over the estimated fair value of the underlying assets acquired and liabilities assumed was allocated to goodwill. Such goodwill principally represents the value of synergies expected to be realized between Cognizant and TriZetto and the acquired assembled workforce, neither of which qualify as a separate amortizable intangible asset. The goodwill is not deductible for tax purposes and has been allocated to our Healthcare reportable segment. The allocation of the purchase price is based upon preliminary estimates and assumptions and is subject to completion of our analysis of the fair value of identifiable assets acquired and liabilities assumed as of the acquisition date. We will finalize the purchase price allocation as soon as practicable within the measurement period, but in no event later than one year following the date of acquisition.
	Acquired identifiable intangible assets were measured at fair value determined primarily using the income approach, which required a forecast of all expected future cash flows either through the use of the relief-from-royalty method or the excess earnings method. The estimated fair value of the identifiable intangible assets and their weighted-average useful lives are as follows:
			Fair Value			Weighted Average Useful Life
	Corporate trademark		$	63,000		Indefinite
	Product trademarks		21,000			16.9 years
	Technology		328,000			7.7 years
	Customer relationships		437,000			15.8 years
	Total		$	849,000
	TriZetto’s results of operations have been included in our financial statements for the period subsequent to the completion of the acquisition on November 20, 2014. The following unaudited pro forma information reflecting the combined operating results of Cognizant and TriZetto for the years ended December 31, 2014 and 2013 assumes the TriZetto Acquisition occurred on January 1, 2013. Such pro forma information does not reflect the potential realization of cost savings relating to the integration of TriZetto.  Further, the pro forma information is not indicative of the combined results of operations that actually would have occurred had the TriZetto Acquisition been completed on January 1,  2013 nor is it intended to be a projection of future operating results.
			Unaudited Pro Forma Information
			For the Years Ended
			31-Dec-14				31-Dec-13
	Revenues		$	10,893,037			$	9,519,569
	Income from operations		1,959,491				1,253,207
	These amounts have been calculated after adjusting for the additional amortization and depreciation expense that would have been recorded assuming the fair value adjustments to finite-lived intangible assets and property, plant and equipment had been applied on January 1, 2013.
	The pro forma income from operations for the year ended December 31, 2014 was adjusted to exclude $40,613 of transaction related professional services costs and $94,341 of other costs incurred. Such costs were included in the pro forma income from operations for the year ended December 31, 2013.
	Supplemental schedule of noncash investing activities:
	In conjunction with the TriZetto acquisition, liabilities were assumed as follows:
		Year Ended December 31, 2014
	Fair value of assets acquired	$	3,070,681
	Purchase price paid in cash (net of cash acquired)	(2,627,830		)
	Liabilities assumed	$	442,851
	Other acquisitions:
	During 2014, excluding the TriZetto Acquisition, we completed three other business combinations for total cash consideration of approximately $46,193 (net of cash acquired). These transactions strengthened our digital business capabilities and expertise to further develop the portfolio of digital solutions and services we offer our customers. As part of these business combinations, we acquired customer relationship assets, assembled workforces, developed technology and other assets.
	During 2013, we completed four business combinations for total cash consideration of approximately $184,200 (net of cash acquired). These transactions strengthened our local presence in Germany, Switzerland and France, expanded our expertise in enterprise application services and high-end testing services, broadened our business process services capabilities within finance and accounting, and strengthened our financial services management and regulatory consulting practice. As part of these business combinations, we acquired customer relationship assets, assembled workforces, a software platform and other assets.
	During 2012, we completed three business combinations for total cash consideration of approximately $28,100 (net of cash acquired). In August of 2012, we entered into a transaction pursuant to which we signed a multi-year service agreement, assumed an assembled workforce, and acquired land, building and other assets. Under the authoritative business combination guidelines, this transaction qualified as a business combination. This transaction expanded our business process services capabilities within the insurance industry. Additionally, in 2012, we completed two business combinations to strengthen our business process services and research capabilities within the media and healthcare industries. As part of these transactions, we acquired customer relationship assets, assembled workforces, and other assets. In addition, during 2012, we settled contingent payment provisions of approximately $31,400 related to business combinations completed in prior years.
	These acquisitions were included in our consolidated financial statements as of the date on which the businesses were acquired and were not material to our operations, financial position or cash flow. We have allocated the purchase price related to these transactions to tangible and intangible assets and liabilities, including goodwill, based on their fair values on their respective dates of acquisition, as follows:
			2014						2013			2012
			Fair Value				Useful Life		Fair Value		Useful Life	Fair Value		Useful Life
	Total initial consideration, net of cash acquired		$	46,193					$	184,200		$	28,100
	Purchase price allocated to:
	Non-deductible goodwill		30,875						129,886			19,096
	Customer relationship intangible assets		12,126				3-10 years		58,572		5-10 years	9,400		6-12 years
	Other intangible assets		4,320				1-4 years		7,192		1-5 years	600		5 years
	The primary items that generated the aforementioned goodwill are the value of the synergies between the acquired companies and us and the acquired assembled workforces, neither of which qualify as an amortizable intangible asset.

Shortterm_Investments

Short-term Investments	12 Months Ended
	Dec. 31, 2014
Investments [Abstract]
Short-term Investments	Short-term Investments
	Our short-term investments were as follows as of December 31:
		2014				2013
	Available-for-sale investment securities:
	U.S. Treasury and agency debt securities	$	544,733			$	506,285
	Corporate and other debt securities	358,563				301,841
	Certificates of deposit and commercial paper	4,592				99,959
	Asset-backed securities	220,084				160,267
	Municipal debt securities	112,783				115,196
	Mutual funds	21,920				21,136
	Total available-for-sale investment securities	1,262,675				1,204,684
	Time deposits	501,902				329,783
	Total short-term investments	$	1,764,577			$	1,534,467
	Our available-for-sale investment securities consist of U.S. dollar denominated investments primarily in U.S. Treasury notes, U.S. government agency debt securities, municipal debt securities, non-U.S. government debt securities, U.S. and international corporate bonds, certificates of deposit, commercial paper, debt securities issued by supranational institutions, mutual funds invested in fixed income securities, and asset-backed securities, including Government National Mortgage Association (GNMA) mortgage backed securities and securities backed by auto loans, credit card receivables, and other receivables. Our investment guidelines are to purchase securities which are investment grade at the time of acquisition. We monitor the credit ratings of the securities in our portfolio on an ongoing basis. The carrying value of the time deposits approximated fair value as of December 31, 2014 and 2013.
	Available-for-Sale Investment Securities
	The amortized cost, gross unrealized gains and losses and fair value of available-for-sale investment securities were as follows at December 31:
		2014
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses				Value
	U.S. Treasury and agency debt securities	$	544,690			$	369			$	(326	)		$	544,733
	Corporate and other debt securities	358,990				339				(766		)		358,563
	Certificates of deposit and commercial paper	4,593				—				(1		)		4,592
	Asset-backed securities	220,358				76				(350		)		220,084
	Municipal debt securities	112,499				351				(67		)		112,783
	Mutual funds	23,940				329				(2,349		)		21,920
	Total available-for-sale investment securities	$	1,265,070			$	1,464			$	(3,859	)		$	1,262,675
		2013
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses				Value
	U.S. Treasury and agency debt securities	$	506,094			$	544			$	(353	)		$	506,285
	Corporate and other debt securities	300,994				1,090				(243		)		301,841
	Certificates of deposit and commercial paper	99,897				62				—				99,959
	Asset-backed securities	160,559				99				(391		)		160,267
	Municipal debt securities	114,888				348				(40		)		115,196
	Mutual funds	22,705				280				(1,849		)		21,136
	Total available-for-sale investment securities	$	1,205,137			$	2,423			$	(2,876	)		$	1,204,684
	The fair value and related unrealized losses of available-for-sale investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of December 31:
		2014
		Less than 12 Months								12 Months or More							Total
		Fair				Unrealized				Fair				Unrealized			Fair		Unrealized
		Value				Losses				Value				Losses			Value		Losses
	U.S. Treasury and agency debt securities	$	256,893			$	(326	)		$	—			$	—		$	256,893	$	(326	)
	Corporate and other debt securities	229,669				(766		)		—				—			229,669		(766		)
	Certificates of deposit and commercial paper	3,692				(1		)		—				—			3,692		(1		)
	Asset-backed securities	151,919				(302		)		2,799				(48		)	154,718		(350		)
	Municipal debt securities	28,036				(67		)		—				—			28,036		(67		)
	Mutual funds	—				—				20,716				(2,349		)	20,716		(2,349		)
	Total	$	670,209			$	(1,462	)		$	23,515			$	(2,397	)	$	693,724	$	(3,859	)
		2013
		Less than 12 Months								12 Months or More							Total
		Fair				Unrealized				Fair				Unrealized			Fair		Unrealized
		Value				Losses				Value				Losses			Value		Losses
	U.S. Treasury and agency debt securities	$	221,548			$	(353	)		$	—			$	—		$	221,548	$	(353	)
	Corporate and other debt securities	106,485				(243		)		—				—			106,485		(243		)
	Asset-backed securities	84,051				(333		)		5,048				(58		)	89,099		(391		)
	Municipal debt securities	10,702				(34		)		1,019				(6		)	11,721		(40		)
	Mutual funds	—				—				20,183				(1,849		)	20,183		(1,849		)
	Total	$	422,786			$	(963	)		$	26,250			$	(1,913	)	$	449,036	$	(2,876	)
	The unrealized losses for the above securities as of December 31, 2014 and 2013 are primarily attributable to changes in interest rates. As of December 31, 2014, we do not consider any of the investments to be other-than-temporarily impaired. The gross unrealized gains and losses in the above tables were recorded, net of tax, in accumulated other comprehensive income (loss).
	The contractual maturities of our fixed income available-for-sale investment securities as of December 31, 2014 are set forth in the following table:
		Amortized				Fair
		Cost				Value
	Due within one year	$	65,735			$	65,766
	Due after one year up to two years	461,035				461,315
Due after two years up to three years	478,111				477,710
Due after three years up to four years	15,891				15,880
Asset-backed securities	220,358				220,084
Fixed income available-for-sale investment securities	$	1,241,130			$	1,240,755
Asset-backed securities were excluded from the maturity categories because the actual maturities may differ from the contractual maturities since the underlying receivables may be prepaid without penalties. Further, actual maturities of debt securities may differ from those presented above since certain obligations provide the issuer the right to call or prepay the obligation prior to scheduled maturity without penalty.
Proceeds from sales of available-for-sale investment securities and the gross gains and losses that have been included in earnings as a result of those sales were as follows:
		2014				2013				2012
Proceeds from sales of available-for-sale investment securities		$	1,475,623			$	1,119,822			$	697,406
Gross gains		$	2,199			$	1,951			$	2,410
Gross losses		(391		)		(554		)		(402		)
Net realized gains on sales of available-for-sale investment securities		$	1,808			$	1,397			$	2,008

Property_and_Equipment_Net

Property and Equipment, Net	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment, Net [Abstract]
Property and Equipment, net	Property and Equipment, net
	Property and equipment were as follows as of December 31:
		Estimated Useful Life (Years)	2014			2013
	Buildings	30	$	605,052		$	444,955
	Computer equipment and software	3	537,298			426,527
	Furniture and equipment	5 – 9	322,579			273,815
	Land		22,644			22,644
	Leasehold land	lease term	60,111			60,306
	Capital work-in-progress		304,676			360,578
	Leasehold improvements	Shorter of the lease term or	246,969			211,675
		the life of the leased asset
	Sub-total		2,099,329			1,800,500
	Accumulated depreciation and amortization		(852,124		)	(719,336		)
	Property and equipment, net		$	1,247,205		$	1,081,164
	Depreciation and amortization expense related to property and equipment was $172,111, $155,681, and $137,561 for the years ended December 31, 2014, 2013, and 2012, respectively.
	At December 31, 2014, the gross amount of property and equipment recorded under capital leases was $36,950 and primarily related to buildings. Amortization expense related to capital lease assets was immaterial for the periods presented.
	In India, leasehold land is leased by us from the government of India with lease terms ranging up to 99 years. Lease payments are made at the inception of the lease agreement and amortized over the lease term. Amortization expense of leasehold land is immaterial for the periods presented and is included in depreciation and amortization expense in our accompanying consolidated statements of operations.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets, net	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	Goodwill and Intangible Assets, net
	Changes in goodwill by our reportable segments were as follows for the years ended December 31, 2014 and 2013:
	Segment		1-Jan-14		Goodwill Additions			Foreign Currency Translation Adjustments			31-Dec-14
	Financial Services		$	208,588	$	3,963		$	(8,133	)	$	204,418
	Healthcare		107,409		1,976,924			(4,410		)	2,079,923
	Manufacturing/Retail/Logistics		71,644		699			(3,154		)	69,189
	Other		56,595		5,405			(1,966		)	60,034
	Total goodwill		$	444,236	$	1,986,991		$	(17,663	)	$	2,413,564
	Segment		1-Jan-13		Goodwill Additions			Foreign Currency Translation Adjustments			31-Dec-13
	Financial Services		$	137,677	$	68,517		$	2,394		$	208,588
	Healthcare		78,977		27,168			1,264			107,409
	Manufacturing/Retail/Logistics		48,304		22,412			928			71,644
	Other		44,227		11,789			579			56,595
	Total goodwill		$	309,185	$	129,886		$	5,165		$	444,236
	In 2014 and 2013, the increase in goodwill was primarily related to business combinations completed during the period and described in Note 2. We have not recognized any impairment losses on our goodwill balances.
	Components of intangible assets were as follows as of December 31:
			2014
			Gross Carrying		Accumulated			Net Carrying
			Amount		Amortization			Amount
	Customer relationships		$	644,408	$	(112,227	)	$	532,181
	Developed technology		332,161		(8,690		)	323,471
	Indefinite life trademarks		63,000		—			63,000
	Other		45,809		(10,712		)	35,097
	Total intangible assets		$	1,085,378	$	(131,629	)	$	953,749
			2013
			Gross Carrying		Accumulated			Net Carrying
			Amount		Amortization			Amount
	Customer relationships		$	203,543	$	(88,159	)	$	115,384
	Developed technology		4,250		(2,994		)	1,256
	Other		21,438		(6,804		)	14,634
	Total intangible assets		$	229,231	$	(97,957	)	$	131,274
	Other than certain trademarks with indefinite lives, our intangible assets have finite lives and as such are subject to amortization. Amortization of intangible assets totaled $35,956 for 2014, $24,249 for 2013, and $19,027 for 2012. During 2014, 2013 and 2012, amortization of $8,403, $7,729 and $7,499, respectively, relating to customer relationship intangible assets was recorded as a reduction of revenues. These intangible assets are attributed to direct revenue contracts with sellers of acquired businesses.
	Estimated amortization expense related to our existing intangible assets for the next five years are as follows:
	Year	Amount
	2015	$	97,095
	2016	95,467
	2017	92,578
	2018	84,903
	2019	82,691

Accrued_Expenses_and_Other_Cur

Accrued Expenses and Other Current Liabilities	12 Months Ended
	Dec. 31, 2014
Accrued Expenses And Other Current Liabilities [Abstract]
Accrued Expenses and Other Current Liabilities	Accrued Expenses and Other Current Liabilities
	Accrued expenses and other current liabilities were as follows as of December 31:
		2014		2013
	Compensation and benefits	$	906,747	$	894,986
	Income taxes	23,846		24,312
	Professional fees	82,664		45,453
	Travel and entertainment	35,013		29,645
	Customer volume incentives	192,114		170,669
	Derivative financial instruments	97,302		191,584
	Other	184,605		121,572
	Total accrued expenses and other current liabilities	$	1,522,291	$	1,478,221

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	Debt
	On November 20, 2014, we entered into a Credit Agreement with a commercial bank syndicate providing for a $1,000,000 unsecured Term Loan and a $750,000 unsecured Revolving Facility. The Term Loan was used to pay a portion of the cash consideration in connection with the TriZetto Acquisition. The Revolving Facility is available for general corporate purposes. The Term Loan and the Revolving Facility both mature on November 20, 2019. As of December 31, 2014, we have drawn down $650,000 under the Revolving Facility. We are required under the Credit Agreement to make scheduled quarterly principal payments on the Term Loan.
	The Credit Agreement requires interest to be paid at either the base rate or the Eurocurrency rate, plus a margin. The margin over the base rate is 0.00%, and the margin over the Eurocurrency rate ranges from 0.75% to 1.125%, depending on our debt ratings (or, if we have not received debt ratings, from 0.875% to 1.00%, depending on our debt to total stockholders' equity ratio). Under the Credit Agreement, we are required to pay commitment fees on the unused portion of the Revolving Facility, which fees vary based on our debt ratings (or, if we have not received debt ratings, our debt to total stockholders' equity ratio). At December 31, 2014, the interest rates on the Term Loan and Revolving Facility were 1.23% and 1.16%, respectively.
	The Credit Agreement contains certain negative covenants, including limitations on liens, mergers, consolidations and acquisitions, subsidiary indebtedness and affiliate transactions, as well as certain affirmative covenants. In addition, the Credit Agreement requires us to maintain a debt to total stockholders' equity ratio not in excess of 0.40:1.00. As of December 31, 2014, we are in compliance with our debt covenants.
	Deferred financing costs of $6,047 related to the Credit Agreement are being amortized over 5 years. As of December 31, 2014, $5,705 of deferred financing costs are reflected in other noncurrent assets in the accompanying consolidated statement of financial position.
	On September 14, 2014, we entered into an unsecured bridge facility (the “Bridge Facility”) that allowed us to borrow up to $1,000,000 to finance the TriZetto Acquisition and to pay fees and expenses in connection therewith. Upon entering into the Credit Agreement, the Bridge Facility was terminated and financing costs of $3,046, related to the Bridge Facility, were expensed.
	There were no short-term or long-term debt balances outstanding as of December 31, 2013.
	Short-term Debt
	The following summarizes our short-term debt balances as of December 31:
		2014
	Notes drawn under Revolving Facility	$	650,000
	Term Loan - current maturities	50,000
	Other	2
	Total short-term debt	$	700,002
	We have classified debt outstanding under our Revolving Facility as a short-term obligation on our consolidated statement of financial position. While the Revolving Facility has a contractual term beyond one year, it requires an execution of a note for each borrowing under the facility and such notes are each less than one year in duration. In addition, management does not intend to continuously replace the notes executed under the Revolving Facility for a continuous period that extends beyond one year.
	Long-term Debt
	The following summarizes our long-term debt balances as of December 31:
		2014
	Term Loan, due 2019	$	987,500
	Less: current maturities	(50,000		)
	Long-term debt, net of current maturities	$	937,500
	The following represents the schedule of maturities of long-term debt during the next five fiscal years:
	Years	Amounts
	2015	$	50,000
	2016	56,250
	2017	81,250
	2018	100,000
	2019	700,000
		$	987,500

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)
	Changes in accumulated other comprehensive income (loss) by component were as follows for the year ended December 31, 2014:
		2014
		Before Tax			Tax			Net of Tax
		Amount			Effect			Amount
	Foreign currency translation adjustments:
	Beginning balance	$	24,033		$	—		$	24,033
	Change in foreign currency translation adjustments	(58,845		)	—			(58,845		)
	Ending balance	$	(34,812	)	$	—		$	(34,812	)
	Unrealized gains (losses) on available-for-sale investment securities:
	Beginning balance	$	(453	)	$	154		$	(299	)
	Net unrealized gains arising during the period	(159		)	73			(86		)
	Reclassification of net (gains) to Other, net	(1,783		)	654			(1,129		)
	Net change	(1,942		)	727			(1,215		)
	Ending balance	$	(2,395	)	$	881		$	(1,514	)
	Unrealized gains (losses) on cash flow hedges:
	Beginning balance	$	(354,876	)	$	54,883		$	(299,993	)
	Unrealized gains arising during the period	115,651			(17,885		)	97,766
	Reclassifications of losses to:
	Cost of revenues	113,367			(17,533		)	95,834
	Selling, general and administrative expenses	23,245			(3,594		)	19,651
	Net change	252,263			(39,012		)	213,251
	Ending balance	$	(102,613	)	$	15,871		$	(86,742	)
	Accumulated other comprehensive income (loss):
	Beginning balance	$	(331,296	)	$	55,037		$	(276,259	)
	Other comprehensive income (loss)	191,476			(38,285		)	153,191
	Ending balance	$	(139,820	)	$	16,752		$	(123,068	)
	Changes in accumulated other comprehensive income (loss) by component were as follows for the years ended December 31, 2013 and 2012:
		2013									2012
		Before Tax			Tax			Net of Tax			Before Tax			Tax			Net of Tax
		Amount			Effect			Amount			Amount			Effect			Amount
	Foreign currency translation adjustments:
	Beginning balance	$	11,572		$	—		$	11,572		$	(3,561	)	$	—		$	(3,561	)
	Change in foreign currency translation adjustments	12,461			—			12,461			15,133			—			15,133
	Ending balance	$	24,033		$	—		$	24,033		$	11,572		$	—		$	11,572
	Unrealized gains (losses) on available-for-sale investment securities:
	Beginning balance	$	2,440		$	(885	)	$	1,555		$	1,986		$	(780	)	$	1,206
	Net unrealized (losses) gains arising during the period	(1,638		)	582			(1,056		)	1,970			(727		)	1,243
	Reclassification of net (gains) to Other, net	(1,255		)	457			(798		)	(1,516		)	622			(894		)
	Net change	(2,893		)	1,039			(1,854		)	454			(105		)	349
	Ending balance	$	(453	)	$	154		$	(299	)	$	2,440		$	(885	)	$	1,555
	Unrealized gains (losses) on cash flow hedges:
	Beginning balance	$	(296,595	)	$	43,785		$	(252,810	)	$	(385,640	)	$	62,601		$	(323,039	)
	Unrealized (losses) arising during the period	(221,275		)	36,248			(185,027		)	(7,065		)	(3,548		)	(10,613		)
	Reclassifications of net losses to:
	Cost of revenues	135,044			(20,839		)	114,205			79,335			(12,601		)	66,734
	Selling, general and administrative expenses	27,950			(4,311		)	23,639			16,775			(2,667		)	14,108
	Net change	(58,281		)	11,098			(47,183		)	89,045			(18,816		)	70,229
	Ending balance	$	(354,876	)	$	54,883		$	(299,993	)	$	(296,595	)	$	43,785		$	(252,810	)
	Accumulated other comprehensive income (loss):
	Beginning balance	$	(282,583	)	$	42,900		$	(239,683	)	$	(387,215	)	$	61,821		$	(325,394	)
	Other comprehensive income (loss)	(48,713		)	12,137			(36,576		)	104,632			(18,921		)	85,711
	Ending balance	$	(331,296	)	$	55,037		$	(276,259	)	$	(282,583	)	$	42,900		$	(239,683	)

Employee_Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Employee Benefits	Employee Benefits
	We contribute to defined contribution plans in the United States and Europe, including 401(k) savings and supplemental retirement plans in the United States. Total expenses for Company contributions to these plans were $45,061, $34,628, and $24,789 for the years ended December 31, 2014, 2013, and 2012, respectively.
	We maintain employee benefit plans that cover substantially all India-based employees. The employees’ provident fund, pension and family pension plans are statutorily defined contribution retirement benefit plans. Under the plans, employees contribute up to 12% of their base compensation, which is matched by an equal contribution by the Company. For these plans, we recognized a contribution expense of $63,397, $56,070, and $54,125 for the years ended December 31, 2014, 2013, and 2012, respectively.
	We also maintain a gratuity plan in India that is a statutory post-employment benefit plan providing defined lump sum benefits. We make annual contributions to the employees’ gratuity fund established with a government-owned insurance corporation to fund a portion of the estimated obligation. Accordingly, our liability for the gratuity plan reflects the undiscounted benefit obligation payable as of the balance sheet date which was based upon the employees’ salary and years of service. As of December 31, 2014 and 2013, the amount accrued under the gratuity plan was $90,794 and $69,629, which is net of fund assets of $66,697 and $55,004, respectively. Expense recognized by us was $36,444, $30,962, and $28,496 for the years ended December 31, 2014, 2013, and 2012, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	Income before provision for income taxes shown below is based on the geographic location to which such income is attributed for years ended December 31:
		2014			2013				2012
	United States	$	589,168		$	540,738			$	381,940
	Foreign	1,334,863			1,147,179				1,005,656
	Income before provision for income taxes	$	1,924,031		$	1,687,917			$	1,387,596
	The provision for income taxes consists of the following components for the years ended December 31:
		2014			2013				2012
	Current:
	Federal and state	$	260,264		$	269,974			$	265,826
	Foreign	324,080			277,559				188,415
	Total current	584,344			547,533				454,241
	Deferred:
	Federal and state	(20,148		)	(37,085		)		(99,649		)
	Foreign	(79,432		)	(51,109		)		(18,259		)
	Total deferred	(99,580		)	(88,194		)		(117,908		)
	Total provision for income taxes	$	484,764		$	459,339			$	336,333
	The reconciliation between our effective income tax rate and the U.S. federal statutory rate were as follows for the years ended December 31:
		2014			%			2013				%		2012			%
	Tax expense, at U.S. federal statutory rate	$	673,411		35			$	590,771			35		$	485,659		35
	State and local income taxes, net of federal benefit	34,466			1.8			33,147				2		24,032			1.7
	Non-taxable income for Indian tax purposes	(182,973		)	(9.5	)		(146,326		)		(8.7	)	(151,789		)	(10.9	)
	Rate differential on foreign earnings	(31,757		)	(1.7	)		(24,606		)		(1.5	)	(22,126		)	(1.6	)
	Other	(8,383		)	(0.4	)		6,353				0.4		557			0
	Total provision for income taxes	$	484,764		25.2			$	459,339			27.2		$	336,333		24.2
	The significant components of deferred income tax assets and liabilities recorded on the consolidated statements of financial position were as follows as of December 31:
		2014			2013
	Deferred income tax assets:
	Net operating losses	$	9,999		$	8,831
	Revenue recognition	56,478			34,368
	Compensation and benefits	145,633			132,134
	Stock-based compensation	22,532			23,202
	Minimum alternative tax (MAT) and other credits	184,257			142,903
	Depreciation and amortization	—			4,720
	Other accrued expenses	101,669			70,193
	Other	15,078			10,170
		535,646			426,521
	Less: valuation allowance	(11,420		)	(5,659		)
	Deferred income tax assets, net	524,226			420,862
	Deferred income tax liabilities:
	Depreciation and amortization	21,169			—
	Intangible assets	280,649			38,653
	Deferred income tax liabilities	301,818			38,653
	Net deferred income tax assets	$	222,408		$	382,209
	At December 31, 2014, we had foreign and U.S. net operating loss carryforwards of approximately $20,085 and $19,715, respectively. We have recorded valuation allowances on certain foreign net operating loss carryforwards. As of December 31, 2014 and 2013, deferred income tax assets related to the minimum alternative tax, or MAT, were approximately $218,500 and $195,000, respectively. The calculation of the MAT includes all profits realized by our Indian subsidiaries and any MAT paid is creditable against future corporate income tax, subject to certain limitations. Our existing MAT assets expire between March 2018 and March 2025 and we expect to fully utilize them within the applicable 10-year expiration periods. In the table above, certain unrecognized income tax benefits have been netted against available same-jurisdiction deferred income tax carryforward assets.
	Our Indian subsidiaries, collectively referred to as Cognizant India, are primarily export-oriented and are eligible for certain income tax holiday benefits granted by the government of India for export activities conducted within Special Economic Zones, or SEZs, for periods of up to 15 years. Our SEZ income tax holiday benefits are currently scheduled to expire in whole or in part during the years 2016 to 2024 and may be extended on a limited basis for an additional five years per unit if certain reinvestment criteria are met. Our Indian profits ineligible for SEZ benefits are subject to corporate income tax at the rate of 33.99%. In addition, all Indian profits, including those generated within SEZs, are subject to the MAT, at the current rate of approximately 21.0%, including surcharges. For the years ended December 31, 2014, 2013, and 2012, the effect of the income tax holidays granted by the Indian government was to reduce the overall income tax provision and increase net income by approximately $182,973, $146,326, and $151,789, respectively, and increase diluted EPS by $0.30, $0.24, and $0.25, respectively.
	We pursue an international strategy that includes expanded infrastructure investments in India and geographic expansion outside the United States. Therefore, other than foreign earnings for which we have already accrued U.S. taxes, we do not intend to repatriate our foreign earnings as such earnings are deemed to be indefinitely reinvested outside the United States. As of December 31, 2014, the amount of unrepatriated Indian earnings and total foreign earnings (including unrepatriated Indian earnings) upon which no incremental U.S. taxes have been recorded is approximately $5,455,000 and $6,121,000, respectively. If such earnings are repatriated in the future, or are no longer deemed to be indefinitely reinvested, we will accrue the applicable amount of taxes associated with such earnings at that time. Due to the various methods by which such earnings could be repatriated in the future, it is not practicable to determine the amount of applicable taxes that would result from such repatriation.
	Due to the geographical scope of our operations, we are subject to tax examinations in various jurisdictions. Accordingly, we record incremental tax expense, based upon the more-likely-than-not standard, for any uncertain tax positions. In addition, when applicable, we adjust the previously recorded income tax expense to reflect examination results when the position is effectively settled or otherwise resolved. Our ongoing evaluations of the more-likely-than-not outcomes of the examinations and related tax positions require judgment and can result in adjustments that increase or decrease our effective income tax rate, as well as impact our operating results. The specific timing of when the resolution of each tax position will be reached is uncertain.
	Changes in unrecognized income tax benefits were as follows for the years ended December 31:
		2014			2013
	Balance, beginning of year	$	96,610		$	92,721
	Additions based on tax positions related to the current year	7,787			12,982
	Additions for tax positions of prior years	5,836			14,854
	Additions for tax positions of acquired subsidiaries	29,238			—
	Reductions for tax positions due to lapse of statutes of limitations	—			(4,353		)
	Reductions for tax positions of prior years	—			(10,199		)
	Settlements	—			—
	Foreign currency exchange movement	(3,900		)	(9,395		)
	Balance, end of year	$	135,571		$	96,610
	At December 31, 2014, the entire balance of unrecognized income tax benefits would affect our effective income tax rate, if recognized. While the Company believes uncertain tax positions may be settled or resolved within the next twelve months, it is difficult to estimate the income tax impact of these potential resolutions at this time. We recognize accrued interest and any penalties associated with uncertain tax positions as part of our provision for income taxes. The total amount of accrued interest and penalties at December 31, 2014 and 2013 was approximately $11,153 and $8,725, respectively, and relates to U.S. and foreign tax matters. The amounts of interest and penalties expensed in 2014, 2013, and 2012 were immaterial.
	We file a U.S. federal consolidated income tax return. The U.S. federal statute of limitations remains open for the years 2011 and onward. The statute of limitations for state audits varies by state. Years still under examination by foreign tax authorities are years 2001 and forward.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	We measure our cash equivalents, investments and foreign exchange forward contracts at fair value. The authoritative guidance defines fair value as the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The authoritative guidance also establishes a fair value hierarchy that is intended to increase consistency and comparability in fair value measurements and related disclosures. The fair value hierarchy is based on inputs to valuation techniques that are used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon their own market assumptions.
	The fair value hierarchy consists of the following three levels:
	•	Level 1 – Inputs are quoted prices in active markets for identical assets or liabilities.
	•	Level 2 – Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.
	•	Level 3 – Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.
	The following table summarizes our financial assets and (liabilities) measured at fair value on a recurring basis as of December 31, 2014:
		Level 1		Level 2			Level 3		Total
	Cash equivalents:
	Money market funds	$	176,474	$	—		$	—	$	176,474
	Commercial paper	—		7,400			—		7,400
	Total cash equivalents	176,474		7,400			—		183,874
	Short-term investments:
	Time deposits	—		501,902			—		501,902
	Available-for-sale investment securities:
	U.S. Treasury and agency debt securities	426,847		117,886			—		544,733
	Corporate and other debt securities	—		358,563			—		358,563
	Certificates of deposit and commercial paper	—		4,592			—		4,592
	Asset-backed securities	—		220,084			—		220,084
	Municipal debt securities	—		112,783			—		112,783
	Mutual funds	—		21,920			—		21,920
	Total available-for-sale investment securities	426,847		835,828			—		1,262,675
	Total short-term investments	426,847		1,337,730			—		1,764,577
	Derivative financial instruments - foreign exchange forward contracts:
	Other current assets	—		2,731			—		2,731
	Accrued expenses and other current liabilities	—		(97,302		)	—		(97,302		)
	Other noncurrent assets	—		3,879			—		3,879
	Other noncurrent liabilities	—		(9,962		)	—		(9,962		)
	Total	$	603,321	$	1,244,476		$	—	$	1,847,797
	The following table summarizes our financial assets and (liabilities) measured at fair value on a recurring basis as of December 31, 2013:
		Level 1		Level 2			Level 3		Total
	Cash equivalents:
	Money market funds	$	694,416	$	—		$	—	$	694,416
	Time deposits	—		128,654			—		128,654
	Commercial paper	—		22,000			—		22,000
	Total cash equivalents	694,416		150,654			—		845,070
	Short-term investments:
	Time deposits	—		329,783			—		329,783
	Available-for-sale investment securities:
	U.S. Treasury and agency debt securities	423,051		83,234			—		506,285
	Corporate and other debt securities	—		301,841			—		301,841
	Certificates of deposit and commercial paper	—		99,959			—		99,959
	Asset-backed securities	—		160,267			—		160,267
	Municipal debt securities	—		115,196			—		115,196
	Mutual funds	—		21,136			—		21,136
	Total available-for-sale investment securities	423,051		781,633			—		1,204,684
	Total short-term investments	423,051		1,111,416			—		1,534,467
	Derivative financial instruments - foreign exchange forward contracts:
	Other current assets	—		11,105			—		11,105
	Accrued expenses and other current liabilities	—		(191,584		)	—		(191,584		)
	Other noncurrent liabilities	—		(164,490		)	—		(164,490		)
	Total	$	1,117,467	$	917,101		$	—	$	2,034,568
	We measure the fair value of money market funds and U.S. Treasury securities based on quoted prices in active markets for identical assets and therefore classify these assets as Level 1. The fair value of commercial paper, certificates of deposit, U.S. government agency securities, municipal debt securities, U.S. and international corporate bonds and foreign government debt securities is measured based on relevant trade data, dealer quotes, or model driven valuations using significant inputs derived from or corroborated by observable market data, such as yield curves and credit spreads. We measure the fair value of our asset-backed securities using model driven valuations based on significant inputs derived from or corroborated by observable market data such as dealer quotes, available trade information, spread data, current market assumptions on prepayment speeds and defaults and historical data on deal collateral performance. The value of the mutual funds invested in fixed income securities is based on the net asset value, or NAV, of the fund, with appropriate consideration of the liquidity and any restrictions on disposition of our investment in the fund.
	We estimate the fair value of each foreign exchange forward contract by using a present value of expected cash flows model. This model calculates the difference between the current market forward price and the contracted forward price for each foreign exchange contract and applies the difference in the rates to each outstanding contract. The market forward rates include a discount and credit risk factor. The amounts are aggregated by type of contract and maturity.
	During the years ended December 31, 2014, 2013 and 2012, there were no transfers among Level 1, Level 2, or Level 3 financial assets and liabilities.

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments
	In the normal course of business, we use foreign exchange forward contracts to manage foreign currency exchange rate risk. The estimated fair value of the foreign exchange forward contracts considers the following items: discount rate, timing and amount of cash flow and counterparty credit risk. Derivatives may give rise to credit risks from the possible non-performance by counterparties. Credit risk is generally limited to the fair value of those contracts that are favorable to us. We have limited our credit risk by entering into derivative transactions only with highly-rated global financial institutions, limiting the amount of credit exposure with any one financial institution and conducting ongoing evaluation of the creditworthiness of the financial institutions with which we do business. In addition, all the assets and liabilities related to our foreign exchange forward contracts set forth in the below table are subject to International Swaps and Derivatives Association, or ISDA, master netting arrangements or other similar agreements with each individual counterparty. These master netting arrangements generally provide for net settlement of all outstanding contracts with the counterparty in the case of an event of default or a termination event. We have presented all the assets and liabilities related to our foreign exchange forward contracts on a gross basis, with no offsets, in our accompanying consolidated statements of financial position. There is no financial collateral (including cash collateral) posted or received by us related to our foreign exchange forward contracts.
	The following table provides information on the location and fair values of derivative financial instruments included in our consolidated statement of financial position as of:
					31-Dec-14								31-Dec-13
	Designation of Derivatives		Location on Statement of		Assets				Liabilities				Assets				Liabilities
			Financial Position
	Cash Flow Hedges – Designated as hedging instruments
	Foreign exchange forward contracts		Other current assets		$	710			$	—			$	—			$	—
			Other noncurrent assets		3,879				—				—				—
			Accrued expenses and other current liabilities		—				97,240				—				190,386
			Other noncurrent liabilities		—				9,962				—				164,490
			Total		4,589				107,202				—				354,876
	Other Derivatives – Not designated as hedging instruments
	Foreign exchange forward contracts		Other current assets		2,021				—				11,105				—
			Accrued expenses and other current liabilities		—				62				—				1,198
			Total		2,021				62				11,105				1,198
	Total				$	6,610			$	107,264			$	11,105			$	356,074
	Cash Flow Hedges
	We have entered into a series of foreign exchange forward contracts that are designated as cash flow hedges of Indian rupee denominated payments in India. These contracts are intended to partially offset the impact of movement of exchange rates on future operating costs and are scheduled to mature each month during 2015, 2016 and 2017. Under these contracts, we purchase Indian rupees and sell U.S. dollars. The changes in fair value of these contracts are initially reported in the caption “accumulated other comprehensive income (loss)” in our consolidated statements of financial position and are subsequently reclassified to earnings in the same period the hedge contract matures. As of December 31, 2014, we estimate that $81,601, net of tax, of the net losses related to derivatives designated as cash flow hedges recorded in accumulated other comprehensive income (loss) is expected to be reclassified into earnings within the next 12 months.
	The notional value of our outstanding contracts by year of maturity and the net unrealized (loss) included in accumulated other comprehensive income (loss) for such contracts were as follows as of:
		31-Dec-14				31-Dec-13
	2014	$	—			$	1,200,000
	2015	1,320,000				900,000
	2016	720,000				240,000
	2017	420,000				—
	Total notional value of contracts outstanding	$	2,460,000			$	2,340,000
	Net unrealized (loss) included in accumulated other comprehensive income (loss), net of taxes	$	(86,742	)		$	(299,993	)
	Upon settlement or maturity of the cash flow hedge contracts, we record the related gain or loss, based on our designation at the commencement of the contract, with the hedged Indian rupee denominated expense reported within cost of revenues and selling, general and administrative expenses. Hedge ineffectiveness was immaterial for all periods presented.
	The following table provides information on the location and amounts of pre-tax (losses) on our cash flow hedges for the year ended December 31:
		Decrease (Increase) in								Location of Net Derivative		Net (Losses) Reclassified
		Derivative								(Losses) Reclassified		from Accumulated Other
		Losses Recognized								from Accumulated Other		Comprehensive Income (Loss)
		in Accumulated Other								Comprehensive Income (Loss)		into Income
		Comprehensive Income (Loss)								into Income		(effective portion)
		(effective portion)								(effective portion)
		2014				2013						2014				2013
	Cash Flow Hedges – Designated as hedging instruments
	Foreign exchange forward contracts	$	115,651			$	(221,275	)		Cost of revenues		$	(113,367	)		$	(135,044	)
										Selling, general and administrative expenses		(23,245		)		(27,950		)
										Total		$	(136,612	)		$	(162,994	)
	The activity related to the change in net unrealized (losses) on our cash flow hedges included in accumulated other comprehensive income (loss) is presented in Note 8.
	Other Derivatives
	We use foreign exchange forward contracts, which have not been designated as hedges, to hedge balance sheet exposure to certain monetary assets and liabilities denominated in currencies other than the functional currency of our foreign subsidiaries. Contracts outstanding as of December 31, 2014 are schedule to mature in 2015. Realized gains or losses and changes in the estimated fair value of these derivative financial instruments are reported in the caption "Foreign currency exchange gains (losses), net" in our consolidated statements of operations.
	Additional information related to our outstanding contracts is as follows as of:
		31-Dec-14								31-Dec-13
		Notional				Market Value				Notional				Market Value
	Contracts to purchase U.S. dollars and sell:
	Indian rupees	$	160,008			$	1,773			$	171,802			$	11,105
	Euros	24,450				198				55,500				(412		)
	British pounds	17,900				51				52,000				(786		)
	Australian dollars	9,600				(58		)		—				—
	Canadian dollars	3,650				(5		)		—				—
	Total	$	215,608			$	1,959			$	279,302			$	9,907
	The following table provides information on the location and amounts of realized and unrealized pre-tax gains and losses on our other derivative financial instruments for the years ended December 31, 2014 and 2013:
			Location of Net (Losses) Gains		Amount of Net (Losses) Gains
			on Derivative Instruments		on Derivative Instruments
					2014				2013
	Other Derivatives – Not designated as hedging instruments		Foreign currency exchange gains (losses), net
	Foreign exchange forward contracts				$	(3,895	)		$	14,084
	The related cash flow impacts of all of our derivative activities are reflected as cash flows from operating activities.

StockBased_Compensation_Plans

Stock-Based Compensation Plans	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans
	On June 5, 2009, our stockholders approved the adoption of the Cognizant Technology Solutions Corporation 2009 Incentive Compensation Plan. On June 30, 2014, our stockholders approved the first amendment to such plan. On September 18, 2014 the Compensation Committee of the Board of Directors approved the second amendment to such plan (as amended, the “2009 Incentive Plan”). Under the 2009 Incentive Plan, 48,000,000 shares of our Class A common stock were reserved for issuance. The 2009 Incentive Plan is the successor plan to our Amended and Restated 1999 Incentive Compensation Plan which terminated on April 13, 2009 in accordance with its terms, our Amended and Restated Non-Employee Directors’ Stock Option Plan and our Amended and Restated Key Employees’ Stock Option Plan which terminated in July 2009 (collectively, the “Predecessor Plans”). The 2009 Incentive Plan will not affect any options or stock issuances outstanding under the Predecessor Plans. No further awards will be made under the Predecessor Plans. As of December 31, 2014, we have 15,651,686 shares available for grant under the 2009 Incentive Plan.
	Stock options granted to employees under our plans have a life ranging from seven to ten years, vest proportionally over four years, unless specified otherwise, and have an exercise price equal to the fair market value of the common stock on the date of grant. Grants to non-employee directors vest proportionally over two years. Stock-based compensation expense relating to stock options is recognized on a straight-line basis over the requisite service period.
	Restricted stock units vest proportionately in quarterly or annual installments over three to four years. Stock-based compensation expense relating to restricted stock units is recognized on a straight-line basis over the requisite service period.
	We granted performance stock units that vest over periods ranging from one to three years to employees, including our executive officers. The vesting of performance stock units is contingent on both meeting revenue performance targets and continued service. Stock-based compensation costs for performance stock units that vest proportionally are recognized on a graded-vesting basis over the vesting period based on the most probable outcome of the performance conditions. If the minimum performance targets are not met, no compensation cost is recognized and any recognized compensation cost is reversed.
	The Company’s 2004 Employee Stock Purchase Plan (the “Purchase Plan”), as amended in 2013, provides for the issuance of up to 28,000,000 shares of Class A common stock to eligible employees. The Purchase Plan provides for eligible employees to purchase whole shares of Class A common stock at a price of 90% of the lesser of: (a) the fair market value of a share of Class A common stock on the first date of the purchase period or (b) the fair market value of a share of Class A common stock on the last date of the purchase period. Stock-based compensation expense for the Purchase Plan is recognized over the vesting period of three months on a straight-line basis. As of December 31, 2014, we had 10,279,356 shares available for future grants and issuances under the Purchase Plan.
	The allocation of total stock-based compensation expense between cost of revenues and selling, general and administrative expenses as well as the related income tax benefit were as follows for the three years ended December 31:
		2014				2013				2012
	Cost of revenues	$	26,762			$	19,107			$	16,773
	Selling, general and administrative expenses	108,063				99,693				90,582
	Total stock-based compensation expense	$	134,825			$	118,800			$	107,355
	Income tax benefit	$	31,374			$	29,387			$	26,206
	We estimate the fair value of each stock option granted using the Black-Scholes option-pricing model. For the years ended December 31, 2014, 2013 and 2012, expected volatility was calculated using implied market volatilities. In addition, the expected term, which represents the period of time, measured from the grant date, that vested options are expected to be outstanding, was derived by incorporating exercise and post-vest termination assumptions, based on historical data, in a Monte Carlo simulation model. The risk-free rate is derived from the U.S. Treasury yield curve in effect at the time of grant. We have not paid any dividends. Forfeiture assumptions used in amortizing stock-based compensation expense are based on an analysis of historical data.
	The fair values of option grants, including the Purchase Plan, were estimated at the date of grant during the years ended December 31, 2014, 2013, and 2012 based upon the following assumptions and were as follows:
		2014				2013				2012
	Dividend yield	0		%		0		%		0		%
	Weighted average volatility factor:
	Stock options	28.74		%		33.47		%		36.71		%
	Purchase Plan	24.86		%		29.17		%		32.31		%
	Weighted average expected life (in years):
	Stock options	3.92				3.82				3.69
	Purchase Plan	0.25				0.25				0.25
	Weighted average risk-free interest rate:
	Stock options	1.25		%		0.73		%		0.43		%
	Purchase Plan	0.02		%		0.05		%		0.06		%
	Weighted average grant date fair value:
	Stock options	$	11.81			$	8.65			$	8.39
	Purchase Plan	$	7.29			$	5.87			$	5.56
	During the year ended December 31, 2014, we issued 1,882,384 shares of Class A common stock under the Purchase Plan with a total vested fair value of approximately $13,725.
	A summary of the activity for stock options granted under our stock-based compensation plans as of December 31, 2014 and changes during the year then ended is presented below:
		Number of			Weighted				Weighted		Aggregate
		Options			Average Exercise				Average		Interinsic
					Price				Remaining Life		Value
					(in dollars)				(in years)		(in thousands)
	Outstanding at January 1, 2014	6,871,722			$	16.43
	Granted	67,736			48.5
	Exercised	(1,547,558	)		12.74
	Cancelled	(26,560	)		28.87
	Expired	(3,703	)		18.04
	Outstanding at December 31, 2014	5,361,637			$	17.84			2.46		$	186,715
	Vested and expected to vest at December 31, 2014	5,350,026			$	17.78			2.45		$	186,607
	Exercisable at December 31, 2014	5,247,661			$	17.31			2.39		$	185,497
	As of December 31, 2014, $660 of total remaining unrecognized stock-based compensation cost related to stock options is expected to be recognized over the weighted-average remaining requisite service period of one year. The total intrinsic value of options exercised was $58,310, $137,446, and $256,623 for the years ended December 31, 2014, 2013, and 2012, respectively.
	The fair value of performance stock units and restricted stock units is determined based on the number of stock units granted and the quoted price of our stock at date of grant.
	A summary of the activity for performance stock units granted under our stock-based compensation plans as of December 31, 2014 and changes during the year then ended is presented below. The presentation reflects the number of performance stock units at the maximum performance milestones.
		Number of			Weighted Average
		Units			Grant Date
					Fair Value
					(in dollars)
	Unvested at January 1, 2014	3,747,622			$	39.23
	Granted	1,942,576			53.89
	Vested	(1,088,423	)		33.09
	Forfeited	(229,132	)		39.42
	Reduction due to the achievement of lower than maximum performance milestones	(728,090	)		46.46
	Unvested at December 31, 2014	3,644,553			$	47.42
	As of December 31, 2014, $82,709 of total remaining unrecognized stock-based compensation cost related to performance stock units is expected to be recognized over the weighted-average remaining requisite service period of 2.03 years.
	A summary of the activity for restricted stock units granted under our stock-based compensation plans as of December 31, 2014 and changes during the year then ended is presented below:
		Number of			Weighted Average
		Units			Grant Date
					Fair Value
					(in dollars)
	Unvested at January 1, 2014	3,596,808			$	38.9
	Granted	4,205,567			51.85
	Vested	(2,110,271	)		39.26
Forfeited	(305,002	)		41.43
Unvested at December 31, 2014	5,387,102			$	48.73
As of December 31, 2014, $227,000 of total remaining unrecognized stock-based compensation cost related to restricted stock units is expected to be recognized over the weighted-average remaining requisite service period of 2.41 years.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	We lease office space and equipment under operating leases, which expire at various dates through the year 2024. Certain leases contain renewal provisions and generally require us to pay utilities, insurance, taxes, and other operating expenses. Future minimum rental payments on our operating leases as of December 31, 2014 are as follows:
		Operating lease obligation
	2015	$	148,320
	2016	125,277
	2017	105,149
	2018	81,682
	2019	71,695
	Thereafter	214,534
	Total minimum lease payments	$	746,657
	Rental expense totaled $190,918, $166,206, and $147,576 for the years ended December 31, 2014, 2013, and 2012, respectively.
	Future minimum rental payments on our capital leases as of December 31, 2014 are as follows:
		Capital lease obligation
	2015	$	4,705
	2016	4,732
	2017	4,243
	2018	3,908
	2019	3,821
	Thereafter	35,364
	Total minimum lease payments	56,773
	Interest	(15,621		)
	Present value of minimum lease payments	$	41,152
	As of December 31, 2014, we had outstanding fixed capital commitments of approximately $20,452 related to our India real estate development program to build new Company-owned state-of-the-art IT development and delivery centers.
	We are involved in various claims and legal actions arising in the ordinary course of business. We accrue a liability when a loss is considered probable and the amount can be reasonably estimated. In the opinion of management, the outcome of any existing claims and legal or regulatory proceedings, if decided adversely, is not expected to have a material adverse effect on our business, financial condition, results of operations and cash flows. Additionally, many of our engagements involve projects that are critical to the operations of our customers’ business and provide benefits that are difficult to quantify. Any failure in a customer’s systems or our failure to meet our contractual obligations to our clients, including any breach involving a customer’s confidential information or sensitive data, or our obligations under applicable laws or regulations could result in a claim for substantial damages against us, regardless of our responsibility for such failure. Although we attempt to contractually limit our liability for damages arising from negligent acts, errors, mistakes, or omissions in rendering our services, there can be no assurance that the limitations of liability set forth in our contracts will be enforceable in all instances or will otherwise protect us from liability for damages. Although we have general liability insurance coverage, including coverage for errors or omissions, there can be no assurance that such coverage will cover all types of claims, continue to be available on reasonable terms or will be available in sufficient amounts to cover one or more large claims, or that the insurer will not disclaim coverage as to any future claim. The successful assertion of one or more large claims against us that exceed or are not covered by our insurance coverage or changes in our insurance policies, including premium increases or the imposition of large deductible or co-insurance requirements, could have a material adverse effect on our business, results of operations, financial condition and cash flows.
	In the normal course of business and in conjunction with certain client engagements, we have entered into contractual arrangements through which we may be obligated to indemnify clients or other parties with whom we conduct business with respect to certain matters. These arrangements can include provisions whereby we agree to hold the indemnified party and certain of their affiliated entities harmless with respect to third-party claims related to such matters as our breach of certain representations or covenants, or out of our intellectual property infringement, our gross negligence or willful misconduct or certain other claims made against certain parties. Payments by us under any of these arrangements are generally conditioned on the client making a claim and providing us with full control over the defense and settlement of such claim. It is not possible to determine the maximum potential amount under these indemnification agreements due to the unique facts and circumstances involved in each particular agreement. Historically, we have not made payments under these indemnification agreements and therefore they have not had any impact on our operating results, financial position, or cash flows. However, if events arise requiring us to make payment for indemnification claims under our indemnification obligations in contracts we have entered, such payments could have material impact on our business, results of operations, financial condition and cash flows.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Segment Information	Segment Information
	Our reportable segments are:
	•	Financial Services, which includes customers providing banking/transaction processing, capital markets and insurance services;
	•	Healthcare, which includes healthcare providers and payers as well as life sciences customers. Our Healthcare business segment includes the post-acquisition operating results of TriZetto;
	•	Manufacturing/Retail/Logistics, which includes manufacturers, retailers, travel and other hospitality customers, as well as customers providing logistics services; and
	•	Other, which is an aggregation of industries each of which, individually, represents less than 10% of consolidated revenues and segment operating profit. The Other reportable segment includes our information, media and entertainment services, communications and high technology operating segments.
	Our sales managers, account executives, account managers and project teams are aligned in accordance with the specific industries they serve.
	Our chief operating decision maker evaluates the Company’s performance and allocates resources based on segment revenues and operating profit. Segment operating profit is defined as income from operations before unallocated costs. Generally, operating expenses for each operating segment have similar characteristics and are subject to the same factors, pressures and challenges. However, the economic environment and its effects on industries served by our operating segments may affect revenue and operating expenses to differing degrees. Expenses included in segment operating profit consist principally of direct selling and delivery costs as well as a per seat charge for use of the development and delivery centers. Certain selling, general and administrative expenses, excess or shortfall of incentive compensation for delivery personnel as compared to target, stock-based compensation expense, a portion of depreciation and amortization and the impact of the settlements of our cash flow hedges are not allocated to individual segments in internal management reports used by the chief operating decision maker. Accordingly, such expenses are excluded from segment operating profit and are separately disclosed as “unallocated” and adjusted only against our total income from operations. Ad, management has determined that it is not practical to allocate identifiable assets by segment, since such assets are used interchangeably among the segments.
	Revenues from external customers and segment operating profit, before unallocated expenses, for the Financial Services, Healthcare, Manufacturing/Retail/Logistics, and Other reportable segments were as follows:
		2014		2013		2012
	Revenues:
	Financial Services	$	4,285,614	$	3,717,573	$	3,035,447
	Healthcare	2,689,427		2,264,826		1,934,898
	Manufacturing/Retail/Logistics	2,093,560		1,868,305		1,498,668
	Other	1,194,080		992,485		877,459
	Total revenue	$	10,262,681	$	8,843,189	$	7,346,472
	Segment Operating Profit:
	Financial Services	$	1,320,116	$	1,212,099	$	998,339
	Healthcare	850,955		829,916		724,454
	Manufacturing/Retail/Logistics	685,745		630,250		527,970
	Other	391,901		318,357		288,052
	Total segment operating profit	3,248,717		2,990,622		2,538,815
	Less: unallocated costs	1,363,839		1,312,712		1,177,319
	Income from operations	$	1,884,878	$	1,677,910	$	1,361,496
	Geographic Area Information
	Revenue and long-lived assets, by geographic area, were as follows:
		2014		2013		2012
	Revenues: (1)
	North America(2)	$	7,879,785	$	6,860,067	$	5,836,258
	Europe(3)	1,883,590		1,579,205		1,195,490
	Rest of World(4)	499,306		403,917		314,724
	Total	$	10,262,681	$	8,843,189	$	7,346,472
		2014		2013		2011
	Long-lived Assets: (5)
	North America(2)	$	188,277	$	48,352	$	52,149
	Europe	29,816		22,707		8,696
	Rest of World(4)(6)	1,029,112		1,010,105		910,641
	Total	$	1,247,205	$	1,081,164	$	971,486
	_____________
	-1	Revenues are attributed to regions based upon customer location.
	-2	Substantially all relates to operations in the United States.
	-3	Includes revenue from operations in the United Kingdom of $1,099,178, $942,579 and $764,936 for the years ended 2014, 2013, and 2012, respectively.
	-4	Includes our operations in Asia Pacific, the Middle East and Latin America.
	-5	Long-lived assets include property and equipment, net of accumulated depreciation and amortization.
	-6	Substantially all of these long-lived assets relate to our operations in India.

Quarterly_Financial_Data_Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Quarterly Financial Data	Quarterly Financial Data (Unaudited)
	Summarized quarterly results for the two years ended December 31, 2014 are as follows:
		Three Months Ended
	2014	March 31		June 30		September 30		December 31		Full Year
	Revenues	$	2,422,348	$	2,517,094	$	2,581,009	$	2,742,230	$	10,262,681
	Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	1,432,444		1,499,462		1,569,828		1,639,384		6,141,118
	Selling, general and administrative expenses	485,395		482,985		506,019		562,622		2,037,021
	Depreciation and amortization expense	44,473		46,726		47,649		60,816		199,664
	Income from operations	460,036		487,921		457,513		479,408		1,884,878
	Net income	348,878		371,908		355,624		362,857		1,439,267
	Basic EPS(1)	$	0.57	$	0.61	$	0.58	$	0.6	$	2.37
	Diluted EPS(1)	$	0.57	$	0.61	$	0.58	$	0.59	$	2.35
		Three Months Ended
	2013	March 31		June 30		September 30		December 31		Full Year
	Revenues	$	2,020,738	$	2,161,240	$	2,305,723	$	2,355,488	$	8,843,189
	Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	1,199,965		1,272,013		1,382,336		1,411,155		5,265,469
	Selling, general and administrative expenses	413,204		420,526		443,376		450,503		1,727,609
	Depreciation and amortization expense	41,662		41,898		42,652		45,989		172,201
	Income from operations	365,907		426,803		437,359		447,841		1,677,910
	Net income	284,209		300,410		319,627		324,332		1,228,578
	Basic EPS(1)	$	0.47	$	0.5	$	0.53	$	0.54	$	2.03
	Diluted EPS(1)	$	0.47	$	0.49	$	0.53	$	0.53	$	2.02
	(1) The sum of the quarterly basic and diluted EPS for each of the four quarters may not equal the EPS for the year due to rounding.

Valuation_And_Qualifying_Accou

Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Valuation And Qualifying Accounts
	Description	Balance at		Charged to		Charged to		Deductions		Balance at
		Beginning of		Costs and		Other		/Other		End of
		Period		Expenses		Accounts(1)				Period
	Trade accounts receivable allowance for doubtful accounts:
	2014	$	26,824	$	4,675	$	6,170	$	744	$	36,925
	2013	$	25,816	$	3,571	$	—	$	2,563	$	26,824
	2012	$	24,658	$	5,051	$	—	$	3,893	$	25,816
	Warranty accrual:
	2014	$	17,699	$	24,943	$	—	$	21,394	$	21,248
	2013	$	14,840	$	20,327	$	—	$	17,468	$	17,699
	2012	$	12,291	$	17,063	$	—	$	14,514	$	14,840
	Valuation allowance—deferred income tax assets:
	2014	$	5,659	$	229	$	5,565	$	33	$	11,420
	2013	$	6,288	$	3,974	$	—	$	4,603	$	5,659
	2012	$	10,365	$	1,399	$	—	$	5,476	$	6,288
	(1) Amounts relate to material acquisitions.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation. The consolidated financial statements are presented in accordance with generally accepted accounting principles in the United States of America, or U.S. GAAP, and reflect the consolidated financial position, results of operations, comprehensive income and cash flows of our consolidated subsidiaries for all periods presented. All intercompany balances and transactions have been eliminated in consolidation.
Cash And Cash Equivalents And Investments	Cash and Cash Equivalents and Investments. Cash and cash equivalents consist of all cash balances, including money market funds and liquid instruments. Liquid instruments are classified as cash equivalents when their maturities at the date of purchase are three months or less and as short-term investments when their maturities at the date of purchase are greater than three months.
	We determine the appropriate classification of our investments in marketable securities at the date of purchase and reevaluate such designation at each balance sheet date. We have classified and accounted for our marketable securities as available-for-sale. After consideration of our risk versus reward objectives, as well as our liquidity requirements, we may sell these securities prior to their stated maturities. As we view these marketable securities as available to support current operations, we classify such securities with maturities at the date of purchase beyond twelve months as short-term investments because such investments represent an investment in cash that is available for current operations.
	Available-for-sale securities are reported at fair value with changes in unrealized gains and losses recorded as a separate component of accumulated other comprehensive income (loss) until realized. We determine the cost of the securities sold based on the specific identification method. Time deposits with financial institutions are valued at cost, which approximates fair value.
	Interest and amortization of premiums and discounts for debt securities are included in interest income. We also evaluate our available-for-sale investments periodically for possible other-than-temporary impairment by reviewing factors such as the length of time and extent to which fair value has been below cost basis, the financial condition of the issuer, whether we intend to sell the security and whether it is more likely than not that we will be required to sell the security prior to recovery of its amortized cost basis. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is generally recorded to income and a new cost basis in the investment is established.
Allowance For Doubtful Accounts	Allowance for Doubtful Accounts. We maintain an allowance for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. The allowance for doubtful accounts is determined by evaluating the relative credit-worthiness of each customer, historical collections experience and other information, including the aging of the receivables. We evaluate the collectibility of our accounts receivable on an on-going basis and write-off accounts when they are deemed to be uncollectible.
Unbilled Accounts Receivable	Unbilled Accounts Receivable. Unbilled accounts receivable represent revenues on contracts to be billed, in subsequent periods, as per the terms of the related contracts.
Short-Term Financial Assets And Liabilities	Short-term Financial Assets and Liabilities. Cash and cash equivalents, trade receivables, accounts payable and other accrued liabilities are short-term in nature and, accordingly, their carrying values approximate fair value.
Property And Equipment	Property and Equipment. Property and equipment are stated at cost, net of accumulated depreciation. Depreciation is calculated on the straight-line basis over the estimated useful lives of the assets. Leasehold improvements are amortized on a straight-line basis over the shorter of the term of the lease or the estimated useful life of the improvement. In India, leasehold land is leased by us from the government of India with lease terms ranging up to 99 years. Lease payments are made at the inception of the lease agreement and amortized over the lease term. Maintenance and repairs are expensed as incurred, while renewals and betterments are capitalized. Deposits paid towards acquisition of long-lived assets and the cost of assets not put in use before the balance sheet date are disclosed under the caption “capital work-in-progress” in Note 4.
Internal Use Software	Internal Use Software. We capitalize certain costs that are incurred to purchase, develop and implement internal-use software during the application development phase, which primarily includes coding and testing and certain data conversion activities. Capitalized costs are amortized on a straight-line basis over the useful life of the software. Costs incurred performing activities associated with the preliminary project phases and post-implementation phases are expensed as incurred.
Business Combinations	Business Combinations. We account for business combinations using the acquisition method, which requires the identification of the acquirer, the determination of the acquisition date, and the allocation of the purchase price paid by the acquirer to the identifiable tangible and intangible assets acquired, the liabilities assumed, and any noncontrolling interest in the acquiree at their acquisition date fair values. Goodwill represents the excess of the purchase price over the fair value of net assets acquired, including the amount assigned to identifiable intangible assets. Identifiable intangible assets with finite lives are amortized over their useful lives. Acquisition-related costs are expensed in the periods in which the costs are incurred. The results of operations of acquired businesses are included in our consolidated financial statements from the acquisition date.
Long-Lived Assets And Intangibles	Long-lived Assets and Finite-lived Intangibles. We review long-lived assets and certain finite-lived identifiable intangibles for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. We recognize an impairment loss when the sum of undiscounted expected future cash flows is less than the carrying amount of such assets. The impairment loss would equal the amount by which the carrying amount of the asset exceeds the fair value of the asset. Other intangibles consist primarily of customer relationships and developed technology, which are being amortized on a straight-line basis over their estimated useful lives.
Goodwill and Indefinite-lived intangibles	Goodwill and Indefinite-lived Intangibles. We evaluate goodwill and indefinite-lived intangible assets, at the reporting unit level, for impairment at least annually, or as circumstances warrant. If an impairment is indicated, a write down to fair value (normally measured by discounting estimated future cash flows) is recorded.
Stock Repurchase Program	Stock Repurchase Program. Our existing stock repurchase program, as amended and approved by our Board of Directors, allows for the repurchase of $2,000,000 of our outstanding shares of Class A common stock and expires on December 31, 2015. Through December 31, 2014, we completed stock repurchases of 35,242,550 shares for $1,186,369, inclusive of fees and expenses, under this program. Additional stock repurchases were made in connection with our stock-based compensation plans, whereby Company shares were tendered by employees for payment of applicable statutory tax withholdings. During 2014, 2013, and 2012 such repurchases totaled 1,207,595, 1,165,872 and 1,065,184 shares, respectively, at an aggregate cost of $60,075, $47,442 and $34,925, respectively. At the time of repurchase, shares are returned to the status of authorized and unissued shares. We account for the repurchases as constructively retired and record such repurchases as a reduction of Class A common stock and additional paid-in capital.
Revenue Recognition	Revenue Recognition. Revenues related to time-and-material contracts are recognized as the service is performed and amounts are earned. Revenues from transaction-priced contracts are recognized as transactions are processed and amounts are earned. Revenues related to fixed-price contracts for highly complex application development and systems integration services are recognized as the service is performed using the percentage of completion method of accounting, under which the total value of revenue is recognized on the basis of the percentage that each contract’s total labor cost to date bears to the total expected labor costs (cost to cost method). Revenues related to fixed price outsourcing services are recognized on a straight-line basis unless revenues are earned and obligations are fulfilled in a different pattern. Revenues related to fixed-price contracts for consulting or other IT services are recognized as services are performed on a proportional performance basis based upon the level of effort.
	For all services, revenue is earned and recognized only when all of the following criteria are met: evidence of an arrangement is obtained, the price is fixed or determinable, the services have been rendered and collectibility is reasonably assured. Contingent or incentive revenues are recognized when the contingency is satisfied and we conclude the amounts are earned. Volume discounts are recorded as a reduction of revenue over the contract period as services are provided. Revenues also include the reimbursement of out-of-pocket expenses.
	Costs to deliver services are expensed to cost of revenues as incurred with the exception of specific costs directly related to transition or set-up activities for outsourcing contracts. Transition costs are deferred and expensed ratably over the period of service. Generally, deferred amounts are protected in the event of early termination of the contract and are monitored regularly for impairment. Impairment losses are recorded when projected remaining undiscounted operating cash flows of the related contract are not sufficient to recover the carrying amount of the contract assets. Deferred transition costs were approximately $98,172 and $80,254 as of December 31, 2014 and 2013, respectively, and are included in other noncurrent assets in our consolidated statements of financial position. Costs related to warranty provisions are accrued at the time the related revenues are recorded.
	We may enter into arrangements that consist of multiple elements. Such arrangements may include any combination of our consulting and technology services and outsourcing services. For arrangements with multiple deliverables, we evaluate at the inception of each new arrangement all deliverables to determine whether they represent separate units of accounting. For arrangements with multiple units of accounting, other than arrangements that contain software licenses and software-related services, we allocate consideration among the units of accounting, where separable, based on their relative selling price. Relative selling price is determined based on vendor-specific objective evidence, or VSOE, if it exists. Otherwise, third-party evidence of selling price is used, when it is available, and in circumstances when neither VSOE nor third-party evidence of selling price is available, management’s best estimate of selling price is used. Revenue is recognized for each unit of accounting based on our revenue recognition policy described above.
	Fixed-price contracts are generally cancelable subject to a specified notice period. All services provided by us through the date of cancellation are due and payable under the contract terms. We issue invoices related to fixed-price contracts based upon achievement of milestones during a project or other contractual terms. Differences between the timing of billing, based on contract milestones or other contractual terms, and the recognition of revenue are recognized as either unbilled receivables or deferred revenue. Estimates of certain fixed-price contracts are subject to adjustment as a project progresses to reflect changes in expected completion costs or efforts. The cumulative impact of any revision in estimates is reflected in the financial reporting period in which the change in estimate becomes known and any anticipated losses on contracts are recognized immediately.
	We also generate product revenue from licensing our software. For perpetual software license arrangements that do not require significant modification or customization of the underlying software, revenue is recognized when the software is delivered and all other software revenue recognition criteria are met. For software license arrangements that require significant functionality enhancements or modification of the software, revenue for the software license and those services is recognized as those services are performed. For software license arrangements that include a right to use the product for a defined period of time, we recognize revenue ratably over the term of the license.
	We may enter into arrangements with customers that purchase both software licenses and software-related services from us at the same time, or within close proximity of one another (referred to as software-related multiple-element arrangements). Such software related multiple-element arrangements may include software licenses, software license updates, product support contracts and other software-related services. For those software related multiple-element arrangements, we apply the residual method to determine the amount of software license revenue. Under the residual method, if VSOE of fair value exists for undelivered elements in a multiple-element arrangement, such fair value of the undelivered elements is deferred with the remaining portion of the arrangement consideration generally recognized upon delivery of the software license. For arrangements in which VSOE of fair value does not exist for each software-related undelivered element, revenue for the software license is deferred and not recognized until VSOE of fair value is available for the undelivered element or delivery of each element has occurred. If the only undelivered element is a service, revenue from the delivered element is recognized over the service period.
	We also enter into multiple-element arrangements that may include a combination of software licenses and various software-related and non-software-related services. In such arrangements, we first allocate the total arrangement consideration, based on relative selling prices, between the software group of elements and the non-software group of elements. We then further allocate consideration within the software group to the respective elements within that group following the software-related multiple-element arrangements policies described above. For the non-software group of elements, we further allocate consideration to the respective elements based on relative selling prices. After the arrangement consideration has been allocated to the individual elements, we account for each respective element in the arrangement as described above.
Stock-Based Compensation	Stock-Based Compensation. Stock-based compensation expense for awards of equity instruments to employees and non-employee directors is determined based on the grant-date fair value of those awards. We recognize these compensation costs net of an estimated forfeiture rate over the requisite service period of the award. Forfeitures are estimated on the date of grant and revised if actual or expected forfeiture activity differs materially from original estimates.
Foreign Currency	Foreign Currency. The assets and liabilities of our foreign subsidiaries whose functional currency is not the U.S. dollar are translated into U.S. dollars from local currencies at current exchange rates and revenues and expenses are translated from local currencies at average monthly exchange rates. The resulting translation adjustments are recorded in accumulated other comprehensive income (loss) on the accompanying consolidated statements of financial position.
	Foreign currency transactions and balances are those that are denominated in a currency other than the subsidiary’s functional currency. The U.S. dollar is the functional currency for certain foreign subsidiaries who conduct business predominantly in U.S. dollars. For these subsidiaries, transactions and balances denominated in the local currency are foreign currency transactions. Foreign currency transactions and balances related to non-monetary assets and liabilities are remeasured to the functional currency of the subsidiary at historical exchange rates while monetary assets and liabilities are remeasured to the functional currency of the subsidiary at current exchange rates. Foreign currency exchange gains or losses from remeasurement are included in income. Net foreign currency exchange (losses) reported on our consolidated statement of operations are inclusive of gains or losses on our undesignated foreign currency hedges.
Derivative Financial Instruments	Derivative Financial Instruments. Derivative financial instruments are accounted for in accordance with the authoritative guidance which requires that each derivative instrument be recorded on the balance sheet as either an asset or liability measured at its fair value as of the reporting date. Our derivative financial instruments consist of foreign exchange forward contracts. For derivative financial instruments to qualify for hedge accounting, the following criteria must be met: (1) the hedging instrument must be designated as a hedge; (2) the hedged exposure must be specifically identifiable and expose us to risk; and (3) it is expected that a change in fair value of the derivative financial instrument and an opposite change in the fair value of the hedged exposure will have a high degree of correlation. The authoritative guidance also requires that changes in our derivatives’ fair values be recognized in income unless specific hedge accounting and documentation criteria are met (i.e., the instruments are accounted for as hedges). For items to which hedge accounting is applied, we record the effective portion of our derivative financial instruments that are designated as cash flow hedges in accumulated other comprehensive income (loss) in the accompanying consolidated statements of financial position. Any ineffectiveness or excluded portion of a designated cash flow hedge is recognized in income.
Use Of Estimates	Use of Estimates. The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, including the recoverability of tangible and intangible assets, disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the period. On an on-going basis, management reevaluates these estimates. The most significant estimates relate to the recognition of revenue and profits based on the percentage of completion method of accounting for certain fixed-bid contracts, the allowance for doubtful accounts, income taxes, valuation of goodwill, intangible assets and other long-lived assets, valuation of investments and derivative financial instruments, assumptions used in valuing stock-based compensation arrangements, contingencies and litigation. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. The actual amounts may vary from the estimates used in the preparation of the accompanying consolidated financial statements.
Risks And Uncertainties	Risks and Uncertainties. The majority of our development and delivery centers and employees are located in India. As a result, we may be subject to certain risks associated with international operations, including risks associated with foreign currency exchange rate fluctuations and risks associated with the application and imposition of protective legislation and regulations relating to import and export or otherwise resulting from foreign policy or the variability of foreign economic or political conditions. Additional risks associated with international operations include difficulties in enforcing intellectual property rights, the burdens of complying with a wide variety of foreign laws, potential geo-political and other risks associated with terrorist activities and local or cross border conflicts and potentially adverse tax consequences, tariffs, quotas and other barriers.
Concentration Of Credit Risk	Concentration of Credit Risk. Financial instruments that potentially subject us to significant concentrations of credit risk consist primarily of cash and cash equivalents, time deposits, investments in securities, derivative financial instruments and trade accounts receivable. We maintain our cash and cash equivalents and investments with high credit quality financial institutions, invest in investment-grade debt securities and limit the amount of credit exposure to any one commercial issuer. Trade accounts receivable are dispersed across many customers operating in different industries; therefore, concentration of credit risk is limited.
Income Taxes	Income Taxes. We provide for income taxes utilizing the asset and liability method of accounting. Under this method, deferred income taxes are recorded to reflect the tax consequences in future years of differences between the tax basis of assets and liabilities and their financial reporting amounts at each balance sheet date, based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. If it is determined that it is more likely than not that future tax benefits associated with a deferred income tax asset will not be realized, a valuation allowance is provided. The effect on deferred income tax assets and liabilities of a change in the tax rates is recognized in income in the period that includes the enactment date. Tax benefits earned on exercise of employee stock options in excess of compensation charged to income are credited to additional paid-in capital. Our provision for income taxes also includes the impact of provisions established for uncertain income tax positions, as well as the related interest.
Earnings Per Share, Or EPS	Earnings Per Share, or EPS. Basic EPS excludes dilution and is computed by dividing earnings available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted EPS includes all potential dilutive common stock in the weighted average shares outstanding. For purposes of computing diluted earnings per share for the years ended December 31, 2014, 2013 and 2012, respectively, 4,363,000, 5,647,000, and 9,140,000 shares were assumed to have been outstanding related to common share equivalents. We exclude options with exercise prices that are greater than the average market price for the period from the calculation of diluted EPS because their effect would be anti-dilutive. We excluded 4,300 shares in 2014, 6,800 shares in 2013, and 39,000 in 2012 from our diluted EPS calculation. Also, in accordance with the authoritative guidance, we excluded from the calculation of diluted EPS an additional 78,800 shares in 2014, 97,800 shares in 2013, and 158,600 shares in 2012, related to stock based awards whose combined exercise price, unamortized fair value and excess tax benefits were greater in each of those periods than the average market price of our common stock because their effect would be anti-dilutive. We include performance stock unit awards in the dilutive potential common shares when they become contingently issuable per the authoritative guidance and exclude the awards when they are not contingently issuable.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncement.
	In July 2013, the Financial Accounting Standards Board, or FASB, issued new guidance which requires the netting of any unrecognized tax benefits against all available same-jurisdiction deferred income tax carryforward assets that would apply if the uncertain tax positions were settled. We adopted this standard on January 1, 2014. As of December 31, 2014, we netted an unrecognized tax benefit of $94,784 against same-jurisdiction noncurrent deferred income tax assets. In our December 31, 2013 consolidated statement of financial position, we reclassified $74,196 from "other non-current liabilities" to non-current "deferred income tax assets, net" to conform to current period's presentation. The adoption of this standard had no effect on our consolidated results of operations or stockholder's equity.
	New Accounting Pronouncement.
	In May 2014, the FASB issued a standard on revenue from contracts with customers. The new standard sets forth a single comprehensive model for recognizing and reporting revenue. The standard also requires additional financial statement disclosures that will enable users to understand the nature, amount, timing and uncertainty of revenue and cash flows relating to customer contracts. The new standard will be effective for periods beginning on or after January 1, 2017. Early adoption is not permitted. The standard allows for two methods of adoption: the full retrospective adoption, which requires the standard to be applied to each prior period presented, or the modified retrospective adoption, which requires the cumulative effect of adoption to be recognized as an adjustment to opening retained earnings in the period of adoption. We are currently evaluating the effect the new standard will have on our consolidated financial statements and related disclosures.

Business_Combinations_Tables

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
Supplemental schedule of noncash investing activities	In conjunction with the TriZetto acquisition, liabilities were assumed as follows:
		Year Ended December 31, 2014
	Fair value of assets acquired	$	3,070,681
	Purchase price paid in cash (net of cash acquired)	(2,627,830		)
	Liabilities assumed	$	442,851
TriZetto [Member]
Business Acquisition [Line Items]
Fair value of assets acquired and liabilities assumed	Our preliminary allocation of purchase price as of November 20, 2014 (the closing date of the TriZetto Acquisition) to the fair value of assets acquired and liabilities assumed is as follows:
			Amount
	Cash		$	170,510
	Trade accounts receivable		83,052
	Unbilled accounts receivable		32,463
	Other current assets		11,218
	Property and equipment		124,050
	Identifiable intangible assets		849,000
	Other noncurrent assets		14,782
	Accounts payable		(12,395		)
	Deferred revenue		(48,281		)
	Accrued expenses and other current liabilities		(118,311		)
	Other noncurrent liabilities		(54,833		)
	Deferred income tax liabilities, net		(209,031		)
	Goodwill		1,956,116
	Total purchase price		$	2,798,340
Schedule of intangible assets acquired as part of business combination	The estimated fair value of the identifiable intangible assets and their weighted-average useful lives are as follows:
			Fair Value			Weighted Average Useful Life
	Corporate trademark		$	63,000		Indefinite
	Product trademarks		21,000			16.9 years
	Technology		328,000			7.7 years
	Customer relationships		437,000			15.8 years
	Total		$	849,000
Schedule of pro forma information
			Unaudited Pro Forma Information
			For the Years Ended
			31-Dec-14				31-Dec-13
	Revenues		$	10,893,037			$	9,519,569
	Income from operations		1,959,491				1,253,207
Other acquisitions [Member]
Business Acquisition [Line Items]
Schedule of intangible assets acquired as part of business combination	We have allocated the purchase price related to these transactions to tangible and intangible assets and liabilities, including goodwill, based on their fair values on their respective dates of acquisition, as follows:
			2014						2013			2012
			Fair Value				Useful Life		Fair Value		Useful Life	Fair Value		Useful Life
	Total initial consideration, net of cash acquired		$	46,193					$	184,200		$	28,100
	Purchase price allocated to:
	Non-deductible goodwill		30,875						129,886			19,096
	Customer relationship intangible assets		12,126				3-10 years		58,572		5-10 years	9,400		6-12 years
	Other intangible assets		4,320				1-4 years		7,192		1-5 years	600		5 years

Shortterm_Investments_Tables

Short-term Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Investments [Abstract]
Schedule of short-term investments	Our short-term investments were as follows as of December 31:
		2014				2013
	Available-for-sale investment securities:
	U.S. Treasury and agency debt securities	$	544,733			$	506,285
	Corporate and other debt securities	358,563				301,841
	Certificates of deposit and commercial paper	4,592				99,959
	Asset-backed securities	220,084				160,267
	Municipal debt securities	112,783				115,196
	Mutual funds	21,920				21,136
	Total available-for-sale investment securities	1,262,675				1,204,684
	Time deposits	501,902				329,783
	Total short-term investments	$	1,764,577			$	1,534,467
Amortized Cost, Gross Unrealized Gains And Losses And Fair Value Of Investment Securities Available-For-Sale	The amortized cost, gross unrealized gains and losses and fair value of available-for-sale investment securities were as follows at December 31:
		2014
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses				Value
	U.S. Treasury and agency debt securities	$	544,690			$	369			$	(326	)		$	544,733
	Corporate and other debt securities	358,990				339				(766		)		358,563
	Certificates of deposit and commercial paper	4,593				—				(1		)		4,592
	Asset-backed securities	220,358				76				(350		)		220,084
	Municipal debt securities	112,499				351				(67		)		112,783
	Mutual funds	23,940				329				(2,349		)		21,920
	Total available-for-sale investment securities	$	1,265,070			$	1,464			$	(3,859	)		$	1,262,675
		2013
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses				Value
	U.S. Treasury and agency debt securities	$	506,094			$	544			$	(353	)		$	506,285
	Corporate and other debt securities	300,994				1,090				(243		)		301,841
	Certificates of deposit and commercial paper	99,897				62				—				99,959
	Asset-backed securities	160,559				99				(391		)		160,267
	Municipal debt securities	114,888				348				(40		)		115,196
	Mutual funds	22,705				280				(1,849		)		21,136
	Total available-for-sale investment securities	$	1,205,137			$	2,423			$	(2,876	)		$	1,204,684
Available-For-Sale Securities In A Continuous Unrealized Loss Position	The fair value and related unrealized losses of available-for-sale investment securities in a continuous unrealized loss position for less than 12 months and for 12 months or longer were as follows as of December 31:
		2014
		Less than 12 Months								12 Months or More							Total
		Fair				Unrealized				Fair				Unrealized			Fair		Unrealized
		Value				Losses				Value				Losses			Value		Losses
	U.S. Treasury and agency debt securities	$	256,893			$	(326	)		$	—			$	—		$	256,893	$	(326	)
	Corporate and other debt securities	229,669				(766		)		—				—			229,669		(766		)
	Certificates of deposit and commercial paper	3,692				(1		)		—				—			3,692		(1		)
	Asset-backed securities	151,919				(302		)		2,799				(48		)	154,718		(350		)
	Municipal debt securities	28,036				(67		)		—				—			28,036		(67		)
	Mutual funds	—				—				20,716				(2,349		)	20,716		(2,349		)
	Total	$	670,209			$	(1,462	)		$	23,515			$	(2,397	)	$	693,724	$	(3,859	)
		2013
		Less than 12 Months								12 Months or More							Total
		Fair				Unrealized				Fair				Unrealized			Fair		Unrealized
		Value				Losses				Value				Losses			Value		Losses
	U.S. Treasury and agency debt securities	$	221,548			$	(353	)		$	—			$	—		$	221,548	$	(353	)
	Corporate and other debt securities	106,485				(243		)		—				—			106,485		(243		)
	Asset-backed securities	84,051				(333		)		5,048				(58		)	89,099		(391		)
	Municipal debt securities	10,702				(34		)		1,019				(6		)	11,721		(40		)
	Mutual funds	—				—				20,183				(1,849		)	20,183		(1,849		)
	Total	$	422,786			$	(963	)		$	26,250			$	(1,913	)	$	449,036	$	(2,876	)
Contractual Maturities Of Investments In Debt Securities Available-For-Sale	The contractual maturities of our fixed income available-for-sale investment securities as of December 31, 2014 are set forth in the following table:
		Amortized				Fair
		Cost				Value
	Due within one year	$	65,735			$	65,766
	Due after one year up to two years	461,035				461,315
	Due after two years up to three years	478,111				477,710
	Due after three years up to four years	15,891				15,880
	Asset-backed securities	220,358				220,084
	Fixed income available-for-sale investment securities	$	1,241,130			$	1,240,755
Gross Gains (Losses) Realized On Sales, Maturities And Other Securities Transactions Related To Investment Securities	Proceeds from sales of available-for-sale investment securities and the gross gains and losses that have been included in earnings as a result of those sales were as follows:
			2014				2013				2012
	Proceeds from sales of available-for-sale investment securities		$	1,475,623			$	1,119,822			$	697,406
	Gross gains		$	2,199			$	1,951			$	2,410
	Gross losses		(391		)		(554		)		(402		)
	Net realized gains on sales of available-for-sale investment securities		$	1,808			$	1,397			$	2,008

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Schedule of property and equipment	Property and equipment were as follows as of December 31:
		Estimated Useful Life (Years)	2014			2013
	Buildings	30	$	605,052		$	444,955
	Computer equipment and software	3	537,298			426,527
	Furniture and equipment	5 – 9	322,579			273,815
	Land		22,644			22,644
	Leasehold land	lease term	60,111			60,306
	Capital work-in-progress		304,676			360,578
	Leasehold improvements	Shorter of the lease term or	246,969			211,675
		the life of the leased asset
	Sub-total		2,099,329			1,800,500
	Accumulated depreciation and amortization		(852,124		)	(719,336		)
	Property and equipment, net		$	1,247,205		$	1,081,164

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets, net (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of Goodwill	Changes in goodwill by our reportable segments were as follows for the years ended December 31, 2014 and 2013:
	Segment		1-Jan-14		Goodwill Additions			Foreign Currency Translation Adjustments			31-Dec-14
	Financial Services		$	208,588	$	3,963		$	(8,133	)	$	204,418
	Healthcare		107,409		1,976,924			(4,410		)	2,079,923
	Manufacturing/Retail/Logistics		71,644		699			(3,154		)	69,189
	Other		56,595		5,405			(1,966		)	60,034
	Total goodwill		$	444,236	$	1,986,991		$	(17,663	)	$	2,413,564
	Segment		1-Jan-13		Goodwill Additions			Foreign Currency Translation Adjustments			31-Dec-13
	Financial Services		$	137,677	$	68,517		$	2,394		$	208,588
	Healthcare		78,977		27,168			1,264			107,409
	Manufacturing/Retail/Logistics		48,304		22,412			928			71,644
	Other		44,227		11,789			579			56,595
	Total goodwill		$	309,185	$	129,886		$	5,165		$	444,236
Schedule of Finite-Lived Intangible Assets	Components of intangible assets were as follows as of December 31:
			2014
			Gross Carrying		Accumulated			Net Carrying
			Amount		Amortization			Amount
	Customer relationships		$	644,408	$	(112,227	)	$	532,181
	Developed technology		332,161		(8,690		)	323,471
	Indefinite life trademarks		63,000		—			63,000
	Other		45,809		(10,712		)	35,097
	Total intangible assets		$	1,085,378	$	(131,629	)	$	953,749
			2013
			Gross Carrying		Accumulated			Net Carrying
			Amount		Amortization			Amount
	Customer relationships		$	203,543	$	(88,159	)	$	115,384
	Developed technology		4,250		(2,994		)	1,256
	Other		21,438		(6,804		)	14,634
	Total intangible assets		$	229,231	$	(97,957	)	$	131,274
Schedule of Indefinite-Lived Intangible Assets	Components of intangible assets were as follows as of December 31:
			2014
			Gross Carrying		Accumulated			Net Carrying
			Amount		Amortization			Amount
	Customer relationships		$	644,408	$	(112,227	)	$	532,181
	Developed technology		332,161		(8,690		)	323,471
	Indefinite life trademarks		63,000		—			63,000
	Other		45,809		(10,712		)	35,097
	Total intangible assets		$	1,085,378	$	(131,629	)	$	953,749
			2013
			Gross Carrying		Accumulated			Net Carrying
			Amount		Amortization			Amount
	Customer relationships		$	203,543	$	(88,159	)	$	115,384
	Developed technology		4,250		(2,994		)	1,256
	Other		21,438		(6,804		)	14,634
	Total intangible assets		$	229,231	$	(97,957	)	$	131,274
Schedule Of Estimated Amortization Expense	Estimated amortization expense related to our existing intangible assets for the next five years are as follows:
	Year	Amount
	2015	$	97,095
	2016	95,467
	2017	92,578
	2018	84,903
	2019	82,691

Accrued_Expenses_and_Other_Cur1

Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Accrued Expenses And Other Current Liabilities [Abstract]
Accrued Expenses And Other Current Liabilities	Accrued expenses and other current liabilities were as follows as of December 31:
		2014		2013
	Compensation and benefits	$	906,747	$	894,986
	Income taxes	23,846		24,312
	Professional fees	82,664		45,453
	Travel and entertainment	35,013		29,645
	Customer volume incentives	192,114		170,669
	Derivative financial instruments	97,302		191,584
	Other	184,605		121,572
	Total accrued expenses and other current liabilities	$	1,522,291	$	1,478,221

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of short-term debt	The following summarizes our short-term debt balances as of December 31:
		2014
	Notes drawn under Revolving Facility	$	650,000
	Term Loan - current maturities	50,000
	Other	2
	Total short-term debt	$	700,002
Schedule of long-term debt	The following summarizes our long-term debt balances as of December 31:
		2014
	Term Loan, due 2019	$	987,500
	Less: current maturities	(50,000		)
	Long-term debt, net of current maturities	$	937,500
Schedule of debt maturities	The following represents the schedule of maturities of long-term debt during the next five fiscal years:
	Years	Amounts
	2015	$	50,000
	2016	56,250
	2017	81,250
	2018	100,000
	2019	700,000
		$	987,500

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule Of Accumulated Other Comprehensive Income (Loss)	Changes in accumulated other comprehensive income (loss) by component were as follows for the year ended December 31, 2014:
		2014
		Before Tax			Tax			Net of Tax
		Amount			Effect			Amount
	Foreign currency translation adjustments:
	Beginning balance	$	24,033		$	—		$	24,033
	Change in foreign currency translation adjustments	(58,845		)	—			(58,845		)
	Ending balance	$	(34,812	)	$	—		$	(34,812	)
	Unrealized gains (losses) on available-for-sale investment securities:
	Beginning balance	$	(453	)	$	154		$	(299	)
	Net unrealized gains arising during the period	(159		)	73			(86		)
	Reclassification of net (gains) to Other, net	(1,783		)	654			(1,129		)
	Net change	(1,942		)	727			(1,215		)
	Ending balance	$	(2,395	)	$	881		$	(1,514	)
	Unrealized gains (losses) on cash flow hedges:
	Beginning balance	$	(354,876	)	$	54,883		$	(299,993	)
	Unrealized gains arising during the period	115,651			(17,885		)	97,766
	Reclassifications of losses to:
	Cost of revenues	113,367			(17,533		)	95,834
	Selling, general and administrative expenses	23,245			(3,594		)	19,651
	Net change	252,263			(39,012		)	213,251
	Ending balance	$	(102,613	)	$	15,871		$	(86,742	)
	Accumulated other comprehensive income (loss):
	Beginning balance	$	(331,296	)	$	55,037		$	(276,259	)
	Other comprehensive income (loss)	191,476			(38,285		)	153,191
	Ending balance	$	(139,820	)	$	16,752		$	(123,068	)
	Changes in accumulated other comprehensive income (loss) by component were as follows for the years ended December 31, 2013 and 2012:
		2013									2012
		Before Tax			Tax			Net of Tax			Before Tax			Tax			Net of Tax
		Amount			Effect			Amount			Amount			Effect			Amount
	Foreign currency translation adjustments:
	Beginning balance	$	11,572		$	—		$	11,572		$	(3,561	)	$	—		$	(3,561	)
	Change in foreign currency translation adjustments	12,461			—			12,461			15,133			—			15,133
	Ending balance	$	24,033		$	—		$	24,033		$	11,572		$	—		$	11,572
	Unrealized gains (losses) on available-for-sale investment securities:
	Beginning balance	$	2,440		$	(885	)	$	1,555		$	1,986		$	(780	)	$	1,206
	Net unrealized (losses) gains arising during the period	(1,638		)	582			(1,056		)	1,970			(727		)	1,243
	Reclassification of net (gains) to Other, net	(1,255		)	457			(798		)	(1,516		)	622			(894		)
	Net change	(2,893		)	1,039			(1,854		)	454			(105		)	349
	Ending balance	$	(453	)	$	154		$	(299	)	$	2,440		$	(885	)	$	1,555
	Unrealized gains (losses) on cash flow hedges:
	Beginning balance	$	(296,595	)	$	43,785		$	(252,810	)	$	(385,640	)	$	62,601		$	(323,039	)
	Unrealized (losses) arising during the period	(221,275		)	36,248			(185,027		)	(7,065		)	(3,548		)	(10,613		)
	Reclassifications of net losses to:
	Cost of revenues	135,044			(20,839		)	114,205			79,335			(12,601		)	66,734
	Selling, general and administrative expenses	27,950			(4,311		)	23,639			16,775			(2,667		)	14,108
	Net change	(58,281		)	11,098			(47,183		)	89,045			(18,816		)	70,229
	Ending balance	$	(354,876	)	$	54,883		$	(299,993	)	$	(296,595	)	$	43,785		$	(252,810	)
	Accumulated other comprehensive income (loss):
	Beginning balance	$	(282,583	)	$	42,900		$	(239,683	)	$	(387,215	)	$	61,821		$	(325,394	)
	Other comprehensive income (loss)	(48,713		)	12,137			(36,576		)	104,632			(18,921		)	85,711
	Ending balance	$	(331,296	)	$	55,037		$	(276,259	)	$	(282,583	)	$	42,900		$	(239,683	)

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule Of Income Before Provision For Income Tax	Income before provision for income taxes shown below is based on the geographic location to which such income is attributed for years ended December 31:
		2014			2013				2012
	United States	$	589,168		$	540,738			$	381,940
	Foreign	1,334,863			1,147,179				1,005,656
	Income before provision for income taxes	$	1,924,031		$	1,687,917			$	1,387,596
Schedule Of Components Of Provision For Income Taxes	The provision for income taxes consists of the following components for the years ended December 31:
		2014			2013				2012
	Current:
	Federal and state	$	260,264		$	269,974			$	265,826
	Foreign	324,080			277,559				188,415
	Total current	584,344			547,533				454,241
	Deferred:
	Federal and state	(20,148		)	(37,085		)		(99,649		)
	Foreign	(79,432		)	(51,109		)		(18,259		)
	Total deferred	(99,580		)	(88,194		)		(117,908		)
	Total provision for income taxes	$	484,764		$	459,339			$	336,333
Reconciliation Between Effective Income Tax Rate and U.S. Federal Statutory Rate	The reconciliation between our effective income tax rate and the U.S. federal statutory rate were as follows for the years ended December 31:
		2014			%			2013				%		2012			%
	Tax expense, at U.S. federal statutory rate	$	673,411		35			$	590,771			35		$	485,659		35
	State and local income taxes, net of federal benefit	34,466			1.8			33,147				2		24,032			1.7
	Non-taxable income for Indian tax purposes	(182,973		)	(9.5	)		(146,326		)		(8.7	)	(151,789		)	(10.9	)
	Rate differential on foreign earnings	(31,757		)	(1.7	)		(24,606		)		(1.5	)	(22,126		)	(1.6	)
	Other	(8,383		)	(0.4	)		6,353				0.4		557			0
	Total provision for income taxes	$	484,764		25.2			$	459,339			27.2		$	336,333		24.2
Schedule Of Deferred Tax Assets and Liabilities	The significant components of deferred income tax assets and liabilities recorded on the consolidated statements of financial position were as follows as of December 31:
		2014			2013
	Deferred income tax assets:
	Net operating losses	$	9,999		$	8,831
	Revenue recognition	56,478			34,368
	Compensation and benefits	145,633			132,134
	Stock-based compensation	22,532			23,202
	Minimum alternative tax (MAT) and other credits	184,257			142,903
	Depreciation and amortization	—			4,720
	Other accrued expenses	101,669			70,193
	Other	15,078			10,170
		535,646			426,521
	Less: valuation allowance	(11,420		)	(5,659		)
	Deferred income tax assets, net	524,226			420,862
	Deferred income tax liabilities:
	Depreciation and amortization	21,169			—
	Intangible assets	280,649			38,653
	Deferred income tax liabilities	301,818			38,653
	Net deferred income tax assets	$	222,408		$	382,209
Summary Of Changes in Unrecognized Tax Benefits	Changes in unrecognized income tax benefits were as follows for the years ended December 31:
		2014			2013
	Balance, beginning of year	$	96,610		$	92,721
	Additions based on tax positions related to the current year	7,787			12,982
	Additions for tax positions of prior years	5,836			14,854
	Additions for tax positions of acquired subsidiaries	29,238			—
	Reductions for tax positions due to lapse of statutes of limitations	—			(4,353		)
	Reductions for tax positions of prior years	—			(10,199		)
	Settlements	—			—
	Foreign currency exchange movement	(3,900		)	(9,395		)
	Balance, end of year	$	135,571		$	96,610

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Financial Assets And (Liabilities) Measured At Fair Value On A Recurring Basis	The following table summarizes our financial assets and (liabilities) measured at fair value on a recurring basis as of December 31, 2014:
		Level 1		Level 2			Level 3		Total
	Cash equivalents:
	Money market funds	$	176,474	$	—		$	—	$	176,474
	Commercial paper	—		7,400			—		7,400
	Total cash equivalents	176,474		7,400			—		183,874
	Short-term investments:
	Time deposits	—		501,902			—		501,902
	Available-for-sale investment securities:
	U.S. Treasury and agency debt securities	426,847		117,886			—		544,733
	Corporate and other debt securities	—		358,563			—		358,563
	Certificates of deposit and commercial paper	—		4,592			—		4,592
	Asset-backed securities	—		220,084			—		220,084
	Municipal debt securities	—		112,783			—		112,783
	Mutual funds	—		21,920			—		21,920
	Total available-for-sale investment securities	426,847		835,828			—		1,262,675
	Total short-term investments	426,847		1,337,730			—		1,764,577
	Derivative financial instruments - foreign exchange forward contracts:
	Other current assets	—		2,731			—		2,731
	Accrued expenses and other current liabilities	—		(97,302		)	—		(97,302		)
	Other noncurrent assets	—		3,879			—		3,879
	Other noncurrent liabilities	—		(9,962		)	—		(9,962		)
	Total	$	603,321	$	1,244,476		$	—	$	1,847,797
	The following table summarizes our financial assets and (liabilities) measured at fair value on a recurring basis as of December 31, 2013:
		Level 1		Level 2			Level 3		Total
	Cash equivalents:
	Money market funds	$	694,416	$	—		$	—	$	694,416
	Time deposits	—		128,654			—		128,654
	Commercial paper	—		22,000			—		22,000
	Total cash equivalents	694,416		150,654			—		845,070
	Short-term investments:
	Time deposits	—		329,783			—		329,783
	Available-for-sale investment securities:
	U.S. Treasury and agency debt securities	423,051		83,234			—		506,285
	Corporate and other debt securities	—		301,841			—		301,841
	Certificates of deposit and commercial paper	—		99,959			—		99,959
	Asset-backed securities	—		160,267			—		160,267
	Municipal debt securities	—		115,196			—		115,196
	Mutual funds	—		21,136			—		21,136
	Total available-for-sale investment securities	423,051		781,633			—		1,204,684
	Total short-term investments	423,051		1,111,416			—		1,534,467
	Derivative financial instruments - foreign exchange forward contracts:
	Other current assets	—		11,105			—		11,105
	Accrued expenses and other current liabilities	—		(191,584		)	—		(191,584		)
	Other noncurrent liabilities	—		(164,490		)	—		(164,490		)
	Total	$	1,117,467	$	917,101		$	—	$	2,034,568

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Location And Fair Values Of Derivative Financial Instruments In Our Condensed Consolidated Statements Of Financial Position	The following table provides information on the location and fair values of derivative financial instruments included in our consolidated statement of financial position as of:
					31-Dec-14								31-Dec-13
	Designation of Derivatives		Location on Statement of		Assets				Liabilities				Assets				Liabilities
			Financial Position
	Cash Flow Hedges – Designated as hedging instruments
	Foreign exchange forward contracts		Other current assets		$	710			$	—			$	—			$	—
			Other noncurrent assets		3,879				—				—				—
			Accrued expenses and other current liabilities		—				97,240				—				190,386
			Other noncurrent liabilities		—				9,962				—				164,490
			Total		4,589				107,202				—				354,876
	Other Derivatives – Not designated as hedging instruments
	Foreign exchange forward contracts		Other current assets		2,021				—				11,105				—
			Accrued expenses and other current liabilities		—				62				—				1,198
			Total		2,021				62				11,105				1,198
	Total				$	6,610			$	107,264			$	11,105			$	356,074
Notional Value Of Outstanding Cash Flow Hedge Contracts By Year Of Maturity And Net Unrealized (Loss) Gain Included In Accumulated Other Comprehensive Income (Loss)	The notional value of our outstanding contracts by year of maturity and the net unrealized (loss) included in accumulated other comprehensive income (loss) for such contracts were as follows as of:
		31-Dec-14				31-Dec-13
	2014	$	—			$	1,200,000
	2015	1,320,000				900,000
	2016	720,000				240,000
	2017	420,000				—
	Total notional value of contracts outstanding	$	2,460,000			$	2,340,000
	Net unrealized (loss) included in accumulated other comprehensive income (loss), net of taxes	$	(86,742	)		$	(299,993	)
Location And Amounts Of Pre-Tax Gains (Losses) On Cash Flow Hedge Derivative Financial Instruments	The following table provides information on the location and amounts of pre-tax (losses) on our cash flow hedges for the year ended December 31:
		Decrease (Increase) in								Location of Net Derivative		Net (Losses) Reclassified
		Derivative								(Losses) Reclassified		from Accumulated Other
		Losses Recognized								from Accumulated Other		Comprehensive Income (Loss)
		in Accumulated Other								Comprehensive Income (Loss)		into Income
		Comprehensive Income (Loss)								into Income		(effective portion)
		(effective portion)								(effective portion)
		2014				2013						2014				2013
	Cash Flow Hedges – Designated as hedging instruments
	Foreign exchange forward contracts	$	115,651			$	(221,275	)		Cost of revenues		$	(113,367	)		$	(135,044	)
										Selling, general and administrative expenses		(23,245		)		(27,950		)
										Total		$	(136,612	)		$	(162,994	)
Additional Information Related To Outstanding Contracts Not Designated As Hedging Instruments	Additional information related to our outstanding contracts is as follows as of:
		31-Dec-14								31-Dec-13
		Notional				Market Value				Notional				Market Value
	Contracts to purchase U.S. dollars and sell:
	Indian rupees	$	160,008			$	1,773			$	171,802			$	11,105
	Euros	24,450				198				55,500				(412		)
	British pounds	17,900				51				52,000				(786		)
	Australian dollars	9,600				(58		)		—				—
	Canadian dollars	3,650				(5		)		—				—
	Total	$	215,608			$	1,959			$	279,302			$	9,907
Location And Amounts Of Pre-Tax Gains (Losses) On Derivative Financial Instruments Not Designated As Hedges	The following table provides information on the location and amounts of realized and unrealized pre-tax gains and losses on our other derivative financial instruments for the years ended December 31, 2014 and 2013:
			Location of Net (Losses) Gains		Amount of Net (Losses) Gains
			on Derivative Instruments		on Derivative Instruments
					2014				2013
	Other Derivatives – Not designated as hedging instruments		Foreign currency exchange gains (losses), net
	Foreign exchange forward contracts				$	(3,895	)		$	14,084

StockBased_Compensation_Plans_

Stock-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Schedule Of Allocation Of Total Stock-Based Compensation Expense	The allocation of total stock-based compensation expense between cost of revenues and selling, general and administrative expenses as well as the related income tax benefit were as follows for the three years ended December 31:
		2014				2013				2012
	Cost of revenues	$	26,762			$	19,107			$	16,773
	Selling, general and administrative expenses	108,063				99,693				90,582
	Total stock-based compensation expense	$	134,825			$	118,800			$	107,355
	Income tax benefit	$	31,374			$	29,387			$	26,206
Schedule Of Assumptions Used To Calculate The Fair Value Of Option Grants	The fair values of option grants, including the Purchase Plan, were estimated at the date of grant during the years ended December 31, 2014, 2013, and 2012 based upon the following assumptions and were as follows:
		2014				2013				2012
	Dividend yield	0		%		0		%		0		%
	Weighted average volatility factor:
	Stock options	28.74		%		33.47		%		36.71		%
	Purchase Plan	24.86		%		29.17		%		32.31		%
	Weighted average expected life (in years):
	Stock options	3.92				3.82				3.69
	Purchase Plan	0.25				0.25				0.25
	Weighted average risk-free interest rate:
	Stock options	1.25		%		0.73		%		0.43		%
	Purchase Plan	0.02		%		0.05		%		0.06		%
	Weighted average grant date fair value:
	Stock options	$	11.81			$	8.65			$	8.39
	Purchase Plan	$	7.29			$	5.87			$	5.56
Summary Of Activity For Stock Options	A summary of the activity for stock options granted under our stock-based compensation plans as of December 31, 2014 and changes during the year then ended is presented below:
		Number of			Weighted				Weighted		Aggregate
		Options			Average Exercise				Average		Interinsic
					Price				Remaining Life		Value
					(in dollars)				(in years)		(in thousands)
	Outstanding at January 1, 2014	6,871,722			$	16.43
	Granted	67,736			48.5
	Exercised	(1,547,558	)		12.74
	Cancelled	(26,560	)		28.87
	Expired	(3,703	)		18.04
	Outstanding at December 31, 2014	5,361,637			$	17.84			2.46		$	186,715
	Vested and expected to vest at December 31, 2014	5,350,026			$	17.78			2.45		$	186,607
	Exercisable at December 31, 2014	5,247,661			$	17.31			2.39		$	185,497
Summary Of The Activity For Performance Stock Units	A summary of the activity for performance stock units granted under our stock-based compensation plans as of December 31, 2014 and changes during the year then ended is presented below. The presentation reflects the number of performance stock units at the maximum performance milestones.
		Number of			Weighted Average
		Units			Grant Date
					Fair Value
					(in dollars)
	Unvested at January 1, 2014	3,747,622			$	39.23
	Granted	1,942,576			53.89
	Vested	(1,088,423	)		33.09
	Forfeited	(229,132	)		39.42
	Reduction due to the achievement of lower than maximum performance milestones	(728,090	)		46.46
	Unvested at December 31, 2014	3,644,553			$	47.42
Summary Of The Activity For Restricted Stock Units	A summary of the activity for restricted stock units granted under our stock-based compensation plans as of December 31, 2014 and changes during the year then ended is presented below:
		Number of			Weighted Average
		Units			Grant Date
					Fair Value
					(in dollars)
	Unvested at January 1, 2014	3,596,808			$	38.9
	Granted	4,205,567			51.85
	Vested	(2,110,271	)		39.26
	Forfeited	(305,002	)		41.43
	Unvested at December 31, 2014	5,387,102			$	48.73

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of future minimum rental payments under non-cancelable operating leases	Future minimum rental payments on our operating leases as of December 31, 2014 are as follows:
		Operating lease obligation
	2015	$	148,320
	2016	125,277
	2017	105,149
	2018	81,682
	2019	71,695
	Thereafter	214,534
	Total minimum lease payments	$	746,657
Schedule of future minimum payments on capital leases	Future minimum rental payments on our capital leases as of December 31, 2014 are as follows:
		Capital lease obligation
	2015	$	4,705
	2016	4,732
	2017	4,243
	2018	3,908
	2019	3,821
	Thereafter	35,364
	Total minimum lease payments	56,773
	Interest	(15,621		)
	Present value of minimum lease payments	$	41,152

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues From External Customers And Segment Operating Profit	Revenues from external customers and segment operating profit, before unallocated expenses, for the Financial Services, Healthcare, Manufacturing/Retail/Logistics, and Other reportable segments were as follows:
		2014		2013		2012
	Revenues:
	Financial Services	$	4,285,614	$	3,717,573	$	3,035,447
	Healthcare	2,689,427		2,264,826		1,934,898
	Manufacturing/Retail/Logistics	2,093,560		1,868,305		1,498,668
	Other	1,194,080		992,485		877,459
	Total revenue	$	10,262,681	$	8,843,189	$	7,346,472
	Segment Operating Profit:
	Financial Services	$	1,320,116	$	1,212,099	$	998,339
	Healthcare	850,955		829,916		724,454
	Manufacturing/Retail/Logistics	685,745		630,250		527,970
	Other	391,901		318,357		288,052
	Total segment operating profit	3,248,717		2,990,622		2,538,815
	Less: unallocated costs	1,363,839		1,312,712		1,177,319
	Income from operations	$	1,884,878	$	1,677,910	$	1,361,496
Revenues And Long-Lived Assets By Geographic Area	Revenue and long-lived assets, by geographic area, were as follows:
		2014		2013		2012
	Revenues: (1)
	North America(2)	$	7,879,785	$	6,860,067	$	5,836,258
	Europe(3)	1,883,590		1,579,205		1,195,490
	Rest of World(4)	499,306		403,917		314,724
	Total	$	10,262,681	$	8,843,189	$	7,346,472
		2014		2013		2011
	Long-lived Assets: (5)
	North America(2)	$	188,277	$	48,352	$	52,149
	Europe	29,816		22,707		8,696
	Rest of World(4)(6)	1,029,112		1,010,105		910,641
	Total	$	1,247,205	$	1,081,164	$	971,486
	_____________
	-1	Revenues are attributed to regions based upon customer location.
	-2	Substantially all relates to operations in the United States.
	-3	Includes revenue from operations in the United Kingdom of $1,099,178, $942,579 and $764,936 for the years ended 2014, 2013, and 2012, respectively.
	-4	Includes our operations in Asia Pacific, the Middle East and Latin America.
	-5	Long-lived assets include property and equipment, net of accumulated depreciation and amortization.
	-6	Substantially all of these long-lived assets relate to our operations in India.

Quarterly_Financial_Data_Unaud1

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Summary Of Quarterly Financial Data	Summarized quarterly results for the two years ended December 31, 2014 are as follows:
		Three Months Ended
	2014	March 31		June 30		September 30		December 31		Full Year
	Revenues	$	2,422,348	$	2,517,094	$	2,581,009	$	2,742,230	$	10,262,681
	Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	1,432,444		1,499,462		1,569,828		1,639,384		6,141,118
	Selling, general and administrative expenses	485,395		482,985		506,019		562,622		2,037,021
	Depreciation and amortization expense	44,473		46,726		47,649		60,816		199,664
	Income from operations	460,036		487,921		457,513		479,408		1,884,878
	Net income	348,878		371,908		355,624		362,857		1,439,267
	Basic EPS(1)	$	0.57	$	0.61	$	0.58	$	0.6	$	2.37
	Diluted EPS(1)	$	0.57	$	0.61	$	0.58	$	0.59	$	2.35
		Three Months Ended
	2013	March 31		June 30		September 30		December 31		Full Year
	Revenues	$	2,020,738	$	2,161,240	$	2,305,723	$	2,355,488	$	8,843,189
	Cost of revenues (exclusive of depreciation and amortization expense shown separately below)	1,199,965		1,272,013		1,382,336		1,411,155		5,265,469
	Selling, general and administrative expenses	413,204		420,526		443,376		450,503		1,727,609
	Depreciation and amortization expense	41,662		41,898		42,652		45,989		172,201
	Income from operations	365,907		426,803		437,359		447,841		1,677,910
	Net income	284,209		300,410		319,627		324,332		1,228,578
	Basic EPS(1)	$	0.47	$	0.5	$	0.53	$	0.54	$	2.03
	Diluted EPS(1)	$	0.47	$	0.49	$	0.53	$	0.53	$	2.02
	(1) The sum of the quarterly basic and diluted EPS for each of the four quarters may not equal the EPS for the year due to rounding.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 04, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Leasehold for land lease terms, maximum years	99 years
Total amount of shares repurchased during period	$248,317,000	$179,004,000	$520,845,000
Deferred transition costs	98,172,000	80,254,000
Dilutive effect of shares issuable under stock-based compensation plans	4,363,000	5,647,000	9,140,000
Unrecognized Tax Benefit, amount netted against Deferred Tax Asset	94,784,000	74,196,000
Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	4,300	6,800	39,000
Other antidilutive securities excluded from computation of earnings per share	78,800	97,800	158,600
Common Class A [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock split ratio				2
Common stock, dividend rate				100.00%
Repurchase of common stock authorized amount maximum	2,000,000,000
Accumulated shares repurchased	35,242,550
Accumulated shares repurchased, value	1,186,369,000
Common Class A [Member] | Share Repurchase Program, Stock-based Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares repurchased during period	1,207,595	1,165,872	1,065,184
Total amount of shares repurchased during period	$60,075,000	$47,442,000	$34,925,000

Business_Combinations_Narrativ

Business Combinations (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 20, 2014
Business Acquisition [Line Items]
Total initial consideration, net of cash acquired	$2,691,437	$193,805	$59,894
TriZetto [Member]
Business Acquisition [Line Items]
Total initial consideration, net of cash acquired	2,627,830
Consideration transferred				2,627,830
Cash acquired				170,510
Other acquisitions [Member]
Business Acquisition [Line Items]
Number of business combinations	3	4	3
Total initial consideration, net of cash acquired	46,193	184,200	28,100
Settlement of contingent payment provisions for previous acquisitions			$31,400

Business_Combinations_Fair_Val

Business Combinations (Fair Value of Assets Acquired and Liabilities Assumed) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 20, 2014
In Thousands, unless otherwise specified
Business Acquisition [Line Items]
Goodwill	$2,413,564	$444,236	$309,185
TriZetto [Member]
Business Acquisition [Line Items]
Cash				170,510
Trade accounts receivable				83,052
Unbilled accounts receivable				32,463
Other current assets				11,218
Property and equipment				124,050
Identifiable intangible assets				849,000
Other noncurrent assets				14,782
Accounts payable				-12,395
Deferred revenue				-48,281
Accrued expenses and other current liabilities				-118,311
Other noncurrent liabilities				-54,833
Deferred income tax liabilities, net				-209,031
Goodwill				1,956,116
Total purchase price				$2,798,340

Business_Combinations_Schedule

Business Combinations (Schedule Intangible Assets Acquired) (Details) (USD $)	12 Months Ended			0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 20, 2014
Business Acquisition [Line Items]
Total initial consideration, net of cash acquired	$2,691,437	$193,805	$59,894
Goodwill	2,413,564	444,236	309,185
TriZetto [Member]
Business Acquisition [Line Items]
Total initial consideration, net of cash acquired	2,627,830
Goodwill				1,956,116
Intangible assets acquired				849,000
TriZetto [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Intangible assets acquired				21,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				16 years 10 months 24 days
TriZetto [Member] | Technology [Member]
Business Acquisition [Line Items]
Intangible assets acquired				328,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				7 years 8 months 12 days
TriZetto [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets acquired				437,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				15 years 9 months 18 days
TriZetto [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Intangible assets acquired				63,000
Other acquisitions [Member]
Business Acquisition [Line Items]
Total initial consideration, net of cash acquired	46,193	184,200	28,100
Goodwill	30,875	129,886	19,096
Other acquisitions [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets acquired	12,126	58,572	9,400
Other acquisitions [Member] | Other Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life			5 years
Intangible assets acquired	$4,320	$7,192	$600
Other acquisitions [Member] | Minimum [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years	5 years	6 years
Other acquisitions [Member] | Minimum [Member] | Other Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year
Other acquisitions [Member] | Maximum [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years	10 years	12 years
Other acquisitions [Member] | Maximum [Member] | Other Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years	5 years

Business_Combinations_Pro_Form

Business Combinations (Pro Forma Information) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
TriZetto [Member]
Business Acquisition [Line Items]
Revenues	$10,893,037	$9,519,569
Income from operations	1,959,491	1,253,207
Transaction Related Professional Service Costs [Member]
Business Acquisition [Line Items]
Selling, general and administrative expenses		40,613
Other Costs Incurred [Member]
Business Acquisition [Line Items]
Selling, general and administrative expenses		$94,341

Business_Combinations_Suppleme

Business Combinations (Supplemental Noncash Information) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Cash paid	($2,691,437)	($193,805)	($59,894)
TriZetto [Member]
Business Acquisition [Line Items]
Fair value of assets acquired	3,070,681
Cash paid	-2,627,830
Liabilities assumed	$442,851

Shortterm_Investments_Shortter

Short-term Investments (Short-term Investments) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investment securities	$1,262,675	$1,204,684
Time deposits	501,902	329,783
Short-term Investments, Total	1,764,577	1,534,467
U.S. Treasury And Agency Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investment securities	544,733	506,285
Corporate And Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investment securities	358,563	301,841
Commercial Paper and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investment securities	4,592	99,959
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investment securities	220,084	160,267
Municipal Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investment securities	112,783	115,196
Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investment securities	$21,920	$21,136

Shortterm_Investments_Amortize

Short-term Investments (Amortized Cost, Gross Unrealized Gains And Losses And Fair Value Of Investment Securities Available-For-Sale) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$1,265,070	$1,205,137
Unrealized gains	1,464	2,423
Unrealized losses	-3,859	-2,876
Fair Value	1,262,675	1,204,684
U.S. Treasury And Agency Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	544,690	506,094
Unrealized gains	369	544
Unrealized losses	-326	-353
Fair Value	544,733	506,285
Corporate And Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	358,990	300,994
Unrealized gains	339	1,090
Unrealized losses	-766	-243
Fair Value	358,563	301,841
Commercial Paper and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,593	99,897
Unrealized gains	0	62
Unrealized losses	-1	0
Fair Value	4,592	99,959
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	220,358	160,559
Unrealized gains	76	99
Unrealized losses	-350	-391
Fair Value	220,084	160,267
Municipal Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	112,499	114,888
Unrealized gains	351	348
Unrealized losses	-67	-40
Fair Value	112,783	115,196
Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	23,940	22,705
Unrealized gains	329	280
Unrealized losses	-2,349	-1,849
Fair Value	$21,920	$21,136

Shortterm_Investments_Availabl

Short-term Investments (Available-For-Sale Securities In A Continuous Unrealized Loss Position) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	$670,209	$422,786
Unrealized losses, less than 12 months	-1,462	-963
Fair value, 12 months or more	23,515	26,250
Unrealized losses, 12 months or more	-2,397	-1,913
Total fair value	693,724	449,036
Total unrealized losses	-3,859	-2,876
U.S. Treasury And Agency Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	256,893	221,548
Unrealized losses, less than 12 months	-326	-353
Fair value, 12 months or more	0	0
Unrealized losses, 12 months or more	0	0
Total fair value	256,893	221,548
Total unrealized losses	-326	-353
Corporate And Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	229,669	106,485
Unrealized losses, less than 12 months	-766	-243
Fair value, 12 months or more	0	0
Unrealized losses, 12 months or more	0	0
Total fair value	229,669	106,485
Total unrealized losses	-766	-243
Commercial Paper and Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	3,692
Unrealized losses, less than 12 months	-1
Fair value, 12 months or more	0
Unrealized losses, 12 months or more	0
Total fair value	3,692
Total unrealized losses	-1
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	151,919	84,051
Unrealized losses, less than 12 months	-302	-333
Fair value, 12 months or more	2,799	5,048
Unrealized losses, 12 months or more	-48	-58
Total fair value	154,718	89,099
Total unrealized losses	-350	-391
Municipal Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	28,036	10,702
Unrealized losses, less than 12 months	-67	-34
Fair value, 12 months or more	0	1,019
Unrealized losses, 12 months or more	0	-6
Total fair value	28,036	11,721
Total unrealized losses	-67	-40
Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	0	0
Unrealized losses, less than 12 months	0	0
Fair value, 12 months or more	20,716	20,183
Unrealized losses, 12 months or more	-2,349	-1,849
Total fair value	20,716	20,183
Total unrealized losses	($2,349)	($1,849)

Shortterm_Investments_Contract

Short-term Investments (Contractual Maturities Of Investments In Debt Securities Available-For-Sale) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Amortized Cost
Due within one year	$65,735
Due after one year up to two years	461,035
Due after two years up to three years	478,111
Due after three years up to four years	15,891
Asset-backed securities	220,358
Amortized Cost	1,241,130
Fair Value
Due within one year	65,766
Due after one year up to two years	461,315
Due after two years up to three years	477,710
Due after three years up to four years	15,880
Asset-backed securities	220,084
Fair Value	$1,240,755

Shortterm_Investments_Gross_Ga

Short-term Investments (Gross Gains (Losses) Realized On Sales, Maturities And Other Securities Transactions Related To Investment Securities) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments [Abstract]
Proceeds from sales of available-for-sale investment securities	$1,475,623	$1,119,822	$697,406
Gross gains	2,199	1,951	2,410
Gross losses	-391	-554	-402
Net realized gains on sales of available-for-sale investment securities	$1,808	$1,397	$2,008

Property_and_Equipment_Net_Nar

Property and Equipment, Net (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Depreciation and amortization expense	$60,816	$47,649	$46,726	$44,473	$45,989	$42,652	$41,898	$41,662	$199,664	$172,201	$149,089
Capital Leased Assets, Gross	36,950								36,950
Leasehold for land lease terms, maximum years									99 years
Property, Plant and Equipment [Member]
Depreciation and amortization expense									$172,111	$155,681	$137,561

Property_and_Equipment_Net_Sch

Property and Equipment, Net (Schedule Of Property And Equipment, Net) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$2,099,329	$1,800,500
Accumulated depreciation and amortization	-852,124	-719,336
Property and Equipment, net	1,247,205	1,081,164	971,486
Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	30 years
Property and Equipment, gross	605,052	444,955
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Property and Equipment, gross	537,298	426,527
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	322,579	273,815
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	9 years
Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	22,644	22,644
Leasehold Land [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	60,111	60,306
Capital Work-in-Progress [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	304,676	360,578
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$246,969	$211,675

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets, net (Schedule Of Goodwill Allocation By Reportable Segments) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$444,236	$309,185
Additions	1,986,991	129,886
Foreign currency translation adjustments	-17,663	5,165
Goodwill, Ending Balance	2,413,564	444,236
Financial Services [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	208,588	137,677
Additions	3,963	68,517
Foreign currency translation adjustments	-8,133	2,394
Goodwill, Ending Balance	204,418	208,588
Healthcare [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	107,409	78,977
Additions	1,976,924	27,168
Foreign currency translation adjustments	-4,410	1,264
Goodwill, Ending Balance	2,079,923	107,409
Manufacturing/Retail/Logistics [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	71,644	48,304
Additions	699	22,412
Foreign currency translation adjustments	-3,154	928
Goodwill, Ending Balance	69,189	71,644
Operating Segments [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance		44,227
Additions		11,789
Foreign currency translation adjustments		579
Goodwill, Ending Balance	60,034	56,595
Other [Member]
Goodwill [Roll Forward]
Additions	5,405
Foreign currency translation adjustments	($1,966)

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets, net (Schedule Of Components For Intangible Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$1,085,378	$229,231
Accumulated amortization	-131,629	-97,957
Net carrying amount	953,749	131,274
Indefinite-Lived Trade Names	63,000
Amortization of intangibles	35,956	24,249	19,027
Amortization Expense Recorded As A Reduction Of Revenues	8,403	7,729	7,499
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	644,408	203,543
Accumulated amortization	-112,227	-88,159
Net carrying amount	532,181	115,384
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	332,161	4,250
Accumulated amortization	-8,690	-2,994
Net carrying amount	323,471	1,256
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	45,809	21,438
Accumulated amortization	-10,712	-6,804
Net carrying amount	$35,097	$14,634

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets, net (Schedule Of Estimated Amortization Expense) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$97,095
2016	95,467
2017	92,578
2018	84,903
2019	$82,691

Accrued_Expenses_and_Other_Cur2

Accrued Expenses and Other Current Liabilities (Accrued Expenses And Other Current Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accrued Expenses And Other Current Liabilities [Abstract]
Compensation and benefits	$906,747	$894,986
Income taxes	23,846	24,312
Professional fees	82,664	45,453
Travel and entertainment	35,013	29,645
Customer volume incentives	192,114	170,669
Derivative financial instruments	97,302	191,584
Other	184,605	121,572
Total accrued expenses and other current liabilities	$1,522,291	$1,478,221

Debt_Details

Debt (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Sep. 14, 2014	Nov. 20, 2014
Bridge Loan [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$1,000,000,000
Financing costs expensed	3,046,000
Term Loan and Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum debt to equity ratio under covenants	0.4
Deferred financing costs, gross	6,047,000
Deferred financing costs, net, noncurrent	5,705,000
Amortization period of deferred financing costs	5 years
Term Loan and Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.00%
Term Loan and Revolving Credit Facility [Member] | Minimum [Member] | Eurocurrency [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.75%
Term Loan and Revolving Credit Facility [Member] | Minimum [Member] | Eurocurrency Without Debt Ratings [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.88%
Term Loan and Revolving Credit Facility [Member] | Maximum [Member] | Eurocurrency [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.13%
Term Loan and Revolving Credit Facility [Member] | Maximum [Member] | Eurocurrency Without Debt Ratings [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Term Loan [Member]
Debt Instrument [Line Items]
Principal amount of debt			1,000,000,000
Interest rate at period end	1.23%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity			750,000,000
Notes drawn under Revolving Facility	$650,000,000
Interest rate at period end	1.16%

Debt_ShortTerm_Debt_Details

Debt (Short-Term Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Short-term Debt [Line Items]
Other	$2
Total short-term debt	700,002	0
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Notes drawn under Revolving Facility	650,000
Term Loan [Member]
Short-term Debt [Line Items]
Term Loan - Current Maturities	$50,000

Debt_LongTerm_Debt_Details

Debt (Long-Term Debt) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Less: current maturities	$987,500
Long-term debt, net of current maturities	937,500	0
Term Loan [Member]
Debt Instrument [Line Items]
Less: current maturities	987,500
Less: Current portion	-50,000
Long-term debt, net of current maturities	$937,500

Debt_Debt_Maturities_Details

Debt (Debt Maturities) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
2015	$50,000
2016	56,250
2017	81,250
2018	100,000
2019	700,000
Less: current maturities	$987,500

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (Schedule Of Changes In Accumulated Other Comprehensive Income (Loss) By Component) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Foreign Currency Translation Adjustment, Before Taxes [Roll Forward]
Foreign currency translation adjustments, beginning balance, before tax	$24,033	$11,572	($3,561)
Change in foreign currency translation, before tax	-58,845	12,461	15,133
Foreign currency translation adjustments, ending balance, before tax	-34,812	24,033	11,572
Foreign Currency Translation Adjustment, Tax [Roll Forward]
Foreign currency translation adjustment, beginning balance, tax	0	0	0
Change in foreign currency translation, tax	0	0	0
Foreign currency translation adjustment, ending balance, tax	0	0	0
Foreign Currency Translation Adjustment, Net of Tax [Roll Forward]
Foreign currency translation adjustments, beginning balance, net of tax	24,033	11,572	-3,561
Change in foreign currency translation, net of tax	-58,845	12,461	15,133
Foreign currency translation adjustments, ending balance, net of tax	-34,812	24,033	11,572
Available-for-sale Securities Adjustment, Before Taxes [Roll Forward]
Unrealized gains (losses) on available-for-sale investment securities, beginning balance, before tax	-453	2,440	1,986
Unrealized (losses) gains arising on available-for-sale investment securities during the period, before tax	-159	-1,638	1,970
Reclassification of (gains) to other, net on available-for-sale investment securities, before tax	-1,783	-1,255	-1,516
Net change on available-for-sale investment securities, before tax	-1,942	-2,893	454
Unrealized gains (losses) on available-for-sale investment securities, ending balance, before tax	-2,395	-453	2,440
Available-for-sale Securities Adjustment, Tax [Roll Forward]
Unrealized gains (losses) on available-for-sale investment securities, beginning balance, tax	154	-885	-780
Unrealized (losses) gains arising on available-for-sale investment securities during the period, tax	73	582	-727
Reclassification of (gains) to other, net on available-for-sale investment securities, tax	654	457	622
Net change on available-for-sale investment securities, tax	727	1,039	-105
Unrealized gains (losses) on available-for-sale investment securities, ending balance, tax	881	154	-885
Available-for-sale Securities Adjustment, Net of Tax [Roll Forward]
Unrealized gains (losses) on available-for-sale investment securities, beginning balance, net of tax	-299	1,555	1,206
Unrealized (losses) gains arising on available-for-sale investment securities during the period, net of tax	-86	-1,056	1,243
Reclassification of (gains) to other, net on available-for-sale investment securities, net of tax	-1,129	-798	-894
Net change on available-for-sale investment securities, net of tax	-1,215	-1,854	349
Unrealized gains (losses) on available-for-sale investment securities, ending balance, net of tax	-1,514	-299	1,555
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Before Taxes [Roll Forward]
Unrealized (losses) on cash flow hedges, beginning balance, before tax	-354,876	-296,595	-385,640
Unrealized (losses) arising on cash flow hedges during the period, before tax	115,651	-221,275	-7,065
Net change on cash flow hedges, before tax	252,263	-58,281	89,045
Unrealized (losses) on cash flow hedges, ending balance, before tax	-102,613	-354,876	-296,595
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax [Roll Forward]
Unrealized (losses) on cash flow hedges, beginning balance, tax	54,883	43,785	62,601
Unrealized (losses) arising on cash flow hedges during the period, tax	-17,885	36,248	-3,548
Net change on cash flow hedges, tax	-39,012	11,098	-18,816
Unrealized (losses) on cash flow hedges, ending balance, tax	15,871	54,883	43,785
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax [Roll Forward]
Unrealized (losses) on cash flow hedges, beginning balance, net of tax	-299,993	-252,810	-323,039
Unrealized (losses) arising on cash flow hedges during the period, net of tax	97,766	-185,027	-10,613
Net change on cash flow hedges, net of tax	213,251	-47,183	70,229
Unrealized (losses) on cash flow hedges, ending balance, net of tax	-86,742	-299,993	-252,810
Accumulated Other Comprehensive Income (Loss), Before Taxes [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance, before tax	-331,296	-282,583	-387,215
Other comprehensive income loss, before tax	191,476	-48,713	104,632
Accumulated other comprehensive income (loss), ending balance, before tax	-139,820	-331,296	-282,583
Accumulated Other Comprehensive Income (Loss), Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance, tax	55,037	42,900	61,821
Other comprehensive income loss, tax	-38,285	12,137	-18,921
Accumulated other comprehensive income (loss), ending balance, tax	16,752	55,037	42,900
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance, net of tax	-276,259	-239,683	-325,394
Other comprehensive income (loss)	153,191	-36,576	85,711
Accumulated other comprehensive income (loss), ending balance, net of tax	-123,068	-276,259	-239,683
Cost Of Revenues [Member]
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Before Taxes [Roll Forward]
Reclassifications of losses on cash flow hedges, before tax	113,367	135,044	79,335
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax [Roll Forward]
Reclassification of losses on cash flow hedges, tax	-17,533	-20,839	-12,601
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax [Roll Forward]
Reclassification of losses on cash flow hedges, net of tax	95,834	114,205	66,734
Selling, General and Administrative Expenses [Member]
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Before Taxes [Roll Forward]
Reclassifications of losses on cash flow hedges, before tax	23,245	27,950	16,775
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax [Roll Forward]
Reclassification of losses on cash flow hedges, tax	-3,594	-4,311	-2,667
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax [Roll Forward]
Reclassification of losses on cash flow hedges, net of tax	$19,651	$23,639	$14,108

Employee_Benefits_Narrative_De

Employee Benefits (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gratuity Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount accrued under gratuity plan net of fund assets	$90,794	$69,629
Fund assets	66,697	55,004
Pension and Other Postretirement Benefit Expense	36,444	30,962	28,496
United States and Europe [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan expense	45,061	34,628	24,789
India
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan expense	$63,397	$56,070	$54,125
Employee contribution percentage, maximum	12.00%

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Deferred income taxes related to MAT	$218,500	$195,000
Minimum alternative tax, expiration period (in years)	10 years
Incentive period for SEZs, years	15 years
Regular corporate income tax rate in India	33.99%
Minimum alternative tax, rate	21.00%
Income tax holiday, increase in net income	182,973	146,326	151,789
Increase in diluted EPS	$0.30	$0.24	$0.25
Unrepatriated foreign earnings	6,121,000
Accrued interest and penalties	11,153	8,725
Foreign Tax Authority [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Net operating loss carryforward	20,085
Internal Revenue Service (IRS) [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Net operating loss carryforward	19,715
India
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrepatriated foreign earnings	$5,455,000

Income_Taxes_Schedule_Of_Incom

Income Taxes (Schedule Of Income Before Provision For Income Tax) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
United States	$589,168	$540,738	$381,940
Foreign	1,334,863	1,147,179	1,005,656
Income before provision for income taxes	$1,924,031	$1,687,917	$1,387,596

Income_Taxes_Schedule_Of_Compo

Income Taxes (Schedule Of Components Of Provision For Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal and state	$260,264	$269,974	$265,826
Foreign	324,080	277,559	188,415
Total current	584,344	547,533	454,241
Deferred:
Federal and state	-20,148	-37,085	-99,649
Foreign	-79,432	-51,109	-18,259
Total deferred	-99,580	-88,194	-117,908
Total provision for income taxes	$484,764	$459,339	$336,333

Income_Taxes_Reconciliation_Be

Income Taxes (Reconciliation Between Effective Income Tax Rate And U.S. Federal Statutory Rate) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax expense, at U.S. federal statutory rate, amount	$673,411	$590,771	$485,659
State and local income taxes, net of federal benefit, amount	34,466	33,147	24,032
Non-taxable income for Indian tax purposes, amount	-182,973	-146,326	-151,789
Rate differential on foreign earnings, amount	-31,757	-24,606	-22,126
Other, amount	-8,383	6,353	557
Total provision for income taxes	$484,764	$459,339	$336,333
Tax expense, at U.S. federal statutory rate, percentage	35.00%	35.00%	35.00%
State and local income taxes, net of federal benefit, percentage	1.80%	2.00%	1.70%
Non-taxable income for Indian tax purposes, percentage	-9.50%	-8.70%	-10.90%
Rate differential on foreign earnings, percentage	-1.70%	-1.50%	-1.60%
Other, percentage	-0.40%	0.40%	0.00%
Total provision for income taxes, percentage	25.20%	27.20%	24.20%

Income_Taxes_Schedule_Of_Defer

Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred income tax assets:
Net operating losses	$9,999	$8,831
Revenue recognition	56,478	34,368
Compensation and benefits	145,633	132,134
Stock-based compensation	22,532	23,202
Minimum alternative tax (MAT) and other credits	184,257	142,903
Depreciation and amortization	0	4,720
Other accrued expenses	101,669	70,193
Other	15,078	10,170
Deferred income tax assets, gross	535,646	426,521
Less valuation allowance	-11,420	-5,659
Deferred income tax assets, net	524,226	420,862
Deferred Tax Liabilities, Property, Plant and Equipment	21,169	0
Deferred income tax liabilities:
Intangible assets	280,649	38,653
Deferred income tax liabilities	301,818	38,653
Net deferred income tax assets	$222,408	$382,209

Income_Taxes_Summary_Of_Change

Income Taxes (Summary Of Changes In Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Changes in unrecognized income tax benefits
Balance, beginning of year	$96,610	$92,721
Additions based on tax positions related to the current year	7,787	12,982
Additions for tax positions of prior years	5,836	14,854
Additions for tax positions of acquired subsidiaries	29,238	0
Reductions for tax positions due to lapse of statutes of limitations	0	-4,353
Reductions for tax positions of prior years	0	-10,199
Settlements	0	0
Foreign currency exchange movement	-3,900	-9,395
Balance, end of year	$135,571	$96,610

Fair_Value_Measurements_Financ

Fair Value Measurements (Financial Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	$183,874	$845,070
Time deposits	501,902	329,783
Available-for-sale investment securities	1,262,675	1,204,684
Investments	1,764,577	1,534,467
Total	1,847,797	2,034,568
Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	2,731	11,105
Accrued Expenses And Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	-97,302	-191,584
Other Noncurrent Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	3,879
Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	-9,962	-164,490
U.S. Treasury And Agency Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	544,733	506,285
Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	358,563	301,841
Commercial Paper and Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	4,592	99,959
Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	220,084	160,267
Municipal Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	112,783	115,196
Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	21,920	21,136
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	176,474	694,416
Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		128,654
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	7,400	22,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	176,474	694,416
Time deposits	0	0
Available-for-sale investment securities	426,847	423,051
Investments	426,847	423,051
Total	603,321	1,117,467
Level 1 [Member] | Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	0	0
Level 1 [Member] | Accrued Expenses And Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	0	0
Level 1 [Member] | Other Noncurrent Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	0
Level 1 [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	0	0
Level 1 [Member] | U.S. Treasury And Agency Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	426,847	423,051
Level 1 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 1 [Member] | Commercial Paper and Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 1 [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 1 [Member] | Municipal Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 1 [Member] | Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 1 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	176,474	694,416
Level 1 [Member] | Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		0
Level 1 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	7,400	150,654
Time deposits	501,902	329,783
Available-for-sale investment securities	835,828	781,633
Investments	1,337,730	1,111,416
Total	1,244,476	917,101
Level 2 [Member] | Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	2,731	11,105
Level 2 [Member] | Accrued Expenses And Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	-97,302	-191,584
Level 2 [Member] | Other Noncurrent Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	3,879
Level 2 [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	-9,962	-164,490
Level 2 [Member] | U.S. Treasury And Agency Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	117,886	83,234
Level 2 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	358,563	301,841
Level 2 [Member] | Commercial Paper and Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	4,592	99,959
Level 2 [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	220,084	160,267
Level 2 [Member] | Municipal Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	112,783	115,196
Level 2 [Member] | Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	21,920	21,136
Level 2 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	0	0
Level 2 [Member] | Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		128,654
Level 2 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	7,400	22,000
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	0	0
Time deposits	0	0
Available-for-sale investment securities	0	0
Investments	0	0
Total	0	0
Level 3 [Member] | Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	0	0
Level 3 [Member] | Accrued Expenses And Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	0	0
Level 3 [Member] | Other Noncurrent Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, assets	0
Level 3 [Member] | Other Noncurrent Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments, liabilities	0	0
Level 3 [Member] | U.S. Treasury And Agency Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 3 [Member] | Corporate And Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 3 [Member] | Commercial Paper and Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 3 [Member] | Asset-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 3 [Member] | Municipal Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 3 [Member] | Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investment securities	0	0
Level 3 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	0	0
Level 3 [Member] | Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		0
Level 3 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	$0	$0

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash flow hedge losses expected to be reclassified to earnings within the next 12 months	$81,601
Cash flow hedge ineffectiveness is immaterial	Hedge ineffectiveness was immaterial for all periods presented.

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Location And Fair Values Of Derivative Financial Instruments In Our Consolidated Statement Of Financial Position) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]
Derivative assets fair value	$6,610	$11,105
Derivative liabilities fair value	107,264	356,074
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	4,589	0
Derivative liabilities fair value	107,202	354,876
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	710	0
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Accrued Expenses And Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	97,240	190,386
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	3,879	0
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	9,962	164,490
Other Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	2,021	11,105
Derivative liabilities fair value	62	1,198
Other Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets fair value	2,021	11,105
Other Derivatives [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Accrued Expenses And Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities fair value	$62	$1,198

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Notional Value Of Outstanding Cash Flow Hedge Contracts By Year Of Maturity And Net Unrealized (Loss) Gain Included In Accumulated Other Comprehensive Income) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Net unrealized (loss) included in accumulated other comprehensive income (loss), net of taxes	($86,742,000)	($299,993,000)	($252,810,000)	($323,039,000)
Cash Flow Hedges [Member] | Foreign Exchange Forward Contracts [Member]
Derivative [Line Items]
Derivative, notional amount	2,460,000,000	2,340,000,000
Net unrealized (loss) included in accumulated other comprehensive income (loss), net of taxes	-86,742,000	-299,993,000
Cash Flow Hedges [Member] | Foreign Exchange Forward, Maturity 2014 [Member]
Derivative [Line Items]
Derivative, notional amount	0	1,200,000,000
Cash Flow Hedges [Member] | Foreign Exchange Forward, Maturity 2015 [Member]
Derivative [Line Items]
Derivative, notional amount	1,320,000,000	900,000,000
Cash Flow Hedges [Member] | Foreign Exchange Forward, Maturity 2016 [Member]
Derivative [Line Items]
Derivative, notional amount	720,000,000	240,000,000
Cash Flow Hedges [Member] | Foreign Exchange Forward, Maturity 2017 [Member]
Derivative [Line Items]
Derivative, notional amount	$420,000,000	$0

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Location And Amounts Of Pre-Tax Gains (Losses) On Cash Flow Hedge Derivatives Financial Instruments) (Details) (Cash Flow Hedges [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Net (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion)	($136,612)	($162,994)
Cost Of Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion)	-113,367	-135,044
Selling, General and Administrative Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (effective portion)	-23,245	-27,950
Foreign Exchange Forward Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Increase) Decrease in Derivative Losses Recognized in Accumulated Other Comprehensive Income (Loss) (effective portion)	$115,651	($221,275)

Derivative_Financial_Instrumen6

Derivative Financial Instruments (Additional Information Related To Outstanding Contracts Not Designated As Hedging Instruments) (Details) (Foreign Exchange Forward Contracts [Member], Not Designated as Hedging Instrument [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative, notional amount	$215,608,000	$279,302,000
Market value	1,959,000	9,907,000
Indian Rupees
Derivative [Line Items]
Derivative, notional amount	160,008,000	171,802,000
Market value	1,773,000	11,105,000
Euros
Derivative [Line Items]
Derivative, notional amount	24,450,000	55,500,000
Market value	198,000	-412,000
British Pounds
Derivative [Line Items]
Derivative, notional amount	17,900,000	52,000,000
Market value	51,000	-786,000
Australia, Dollars
Derivative [Line Items]
Derivative, notional amount	9,600,000	0
Market value	-58,000	0
Canada, Dollars
Derivative [Line Items]
Derivative, notional amount	3,650,000	0
Market value	($5,000)	$0

Derivative_Financial_Instrumen7

Derivative Financial Instruments (Location And Amounts Of Pre-Tax Gains (Losses) On Derivative Financial Instruments Not Designated As Hedges) (Details) (Not Designated as Hedging Instrument [Member], Foreign Exchange Forward Contracts [Member], Foreign Currency Gain (Loss) [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward Contracts [Member] | Foreign Currency Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of net gains (losses) on derivative instruments	($3,895)	$14,084

StockBased_Compensation_Plans_1

Stock-Based Compensation Plans (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 05, 2009
2009 Incentive Plan [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Shares authorized				48,000,000
Shares available for grant	15,651,686
Stock Options [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period	4 years
Unrecognized stock-based compensation expense	$660
Weighted average remaining requisite service period	1 year
Total intrinsic value of options exercised	58,310	137,446	256,623
Performance Stock Units [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized stock-based compensation expense	82,709
Weighted average remaining requisite service period	2 years 0 months 11 days
Employee Stock [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Shares authorized	28,000,000
Shares available for grant	10,279,356
Vesting period	3 months
Eligible employees purchase percentage of whole share of fair market value	90.00%
Shares issued	1,882,384
Fair value of shares issued	13,725
Restricted Stock Units [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized stock-based compensation expense	$227,000
Weighted average remaining requisite service period	2 years 4 months 28 days
Non-Employee Directors [Member] | Stock Options [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period	2 years
Minimum [Member] | Stock Options [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Life of share-based payment award	7 years
Minimum [Member] | Performance Stock Units [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period	1 year
Minimum [Member] | Restricted Stock Units [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period	3 years
Maximum [Member] | Stock Options [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Life of share-based payment award	10 years
Maximum [Member] | Performance Stock Units [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period	3 years
Maximum [Member] | Restricted Stock Units [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Vesting period	4 years

StockBased_Compensation_Plans_2

Stock-Based Compensation Plans (Schedule Of Allocation Of Total Stock-Based Compensation Expense) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$134,825	$118,800	$107,355
Income tax benefit	31,374	29,387	26,206
Cost Of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	26,762	19,107	16,773
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$108,063	$99,693	$90,582

StockBased_Compensation_Plans_3

Stock-Based Compensation Plans (Schedule Of Assumptions Used To Calculate The Fair Value Of Option Grants) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Stock Options [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Weighted average volatility factor	28.74%	33.47%	36.71%
Weighted average expected life (in years)	3 years 11 months 1 day	3 years 9 months 26 days	3 years 8 months 9 days
Weighted average risk-free interest rate	1.25%	0.73%	0.43%
Weighted average grant date fair value	11.81	8.65	8.39
Employee Stock [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Weighted average volatility factor	24.86%	29.17%	32.31%
Weighted average expected life (in years)	3 months	3 months	3 months
Weighted average risk-free interest rate	0.02%	0.05%	0.06%
Weighted average grant date fair value	7.29	5.87	5.56

StockBased_Compensation_Plans_4

Stock-Based Compensation Plans (Summary Of The Activity For Stock Options) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014
Number of Options
Number of Options, Outstanding at beginning of year	6,871,722
Number of Options, Granted	67,736
Number of Options, Exercised	-1,547,558
Number of Options, Cancelled	-26,560
Number of Options, Expired	-3,703
Number of Options, Outstanding at end of period	5,361,637
Number of Options, Vested and expected to vest at end of year	5,350,026
Number of Options, Exercisable at end of year	5,247,661
Weighted Average Exercise Price (in dollars)
Weighted Average Exercise Price, Outstanding at beginning of year	$16.43
Weighted Average Exercise Price, Granted	$48.50
Weighted Average Exercise Price, Exercised	$12.74
Weighted Average Exercise Price, Cancelled	$28.87
Weighted Average Exercise Price, Expired	$18.04
Weighted Average Exercise Price, Outstanding at end of year	$17.84
Weighted Average Exercise Price, Vested and expected to vest at end of year	$17.78
Weighted Average Exercise Price, Exercisable at end of year	$17.31
Weighted Average Remaining Life, Outstanding at end of year (in years)	2 years 5 months 16 days
Weighted Average Remaining Life, Vested and expected to vest at end of year (in years)	2 years 5 months 12 days
Weighted Average Remaining Life, Exercisable at end of year (in years)	2 years 4 months 21 days
Aggregate Intrinsic Value, Outstanding at end of year	$186,715
Aggregate Intrinsic Value, Vested and expected to vest at end of year	186,607
Aggregate Intrinsic Value, Exercisable at end of year	$185,497

StockBased_Compensation_Plans_5

Stock-Based Compensation Plans (Summary Of The Activity For Performance Stock Units) (Details) (Performance Stock Units [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014
Performance Stock Units [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized stock-based compensation expense	$82,709
Weighted average remaining requisite service period	2 years 0 months 11 days
Number of Units
Number of Units, Unvested at beginning of period	3,747,622
Number of Units, Granted	1,942,576
Number of Units, Vested	-1,088,423
Number of Units, Forfeited	-229,132
Number of Units, Reduction due to the achievement of lower than maximum performance milestones	-728,090
Number of Units, Unvested at end of period	3,644,553
Weighted Average Grant Date Fair Value (in dollars)
Weighted Average Grant Date Fair Value, Unvested at beginning of period	$39.23
Weighted Average Grant Date Fair Value, Granted	$53.89
Weighted Average Grant Date Fair Value, Vested	$33.09
Weighted Average Grant Date Fair Value, Forfeited	$39.42
Weighted Average Grant Date Fair Value, Reduction due to the achievement of lower than maximum performance milestones	$46.46
Weighted Average Grant Date Fair Value, Unvested at end of period	$47.42

StockBased_Compensation_Plans_6

Stock-Based Compensation Plans (Summary Of The Activity For Restricted Stock Units) (Details) (Restricted Stock Units [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014
Restricted Stock Units [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unrecognized stock-based compensation expense	$227,000
Weighted average remaining requisite service period	2 years 4 months 28 days
Number of Units
Number of Units, Unvested at beginning of period	3,596,808
Number of Units, Granted	4,205,567
Number of Units, Vested	-2,110,271
Number of Units, Forfeited	-305,002
Number of Units, Unvested at end of period	5,387,102
Weighted Average Grant Date Fair Value (in dollars)
Weighted Average Grant Date Fair Value, Unvested at beginning of period	$38.90
Weighted Average Grant Date Fair Value, Granted	$51.85
Weighted Average Grant Date Fair Value, Vested	$39.26
Weighted Average Grant Date Fair Value, Forfeited	$41.43
Weighted Average Grant Date Fair Value, Unvested at end of period	$48.73

Commitments_and_Contingencies_1

Commitments and Contingencies (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$190,918	$166,206	$147,576
Outstanding fixed capital commitments related to our India development center expansion program	$20,452

Commitments_and_Contingencies_2

Commitments and Contingencies (Operating Leases) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
2015	$148,320
2016	125,277
2017	105,149
2018	81,682
2019	71,695
Thereafter	214,534
Total minimum lease payments	$746,657

Commitments_and_Contingencies_3

Commitments and Contingencies (Capital Leases) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
2015	$4,705
2016	4,732
2017	4,243
2018	3,908
2019	3,821
Thereafter	35,364
Total minimum lease payments	56,773
Interest	-15,621
Present value of minimum lease payments	$41,152

Segment_Information_Narrative_

Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Percentage of consolidated revenues and segment operating profit, maximum	10.00%

Segment_Information_Revenues_F

Segment Information (Revenues From External Customers And Segment Operating Profit) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$2,742,230	$2,581,009	$2,517,094	$2,422,348	$2,355,488	$2,305,723	$2,161,240	$2,020,738	$10,262,681	$8,843,189	$7,346,472
Income from operations	479,408	457,513	487,921	460,036	447,841	437,359	426,803	365,907	1,884,878	1,677,910	1,361,496
Stock-based compensation expense									134,825	118,800	107,355
Financial Services [Member]
Segment Reporting Information [Line Items]
Revenues									4,285,614	3,717,573	3,035,447
Income from operations									1,320,116	1,212,099	998,339
Healthcare [Member]
Segment Reporting Information [Line Items]
Revenues									2,689,427	2,264,826	1,934,898
Income from operations									850,955	829,916	724,454
Manufacturing/Retail/Logistics [Member]
Segment Reporting Information [Line Items]
Revenues									2,093,560	1,868,305	1,498,668
Income from operations									685,745	630,250	527,970
Other [Member]
Segment Reporting Information [Line Items]
Revenues									1,194,080	992,485	877,459
Income from operations									391,901	318,357	288,052
Operating Segments [Member]
Segment Reporting Information [Line Items]
Income from operations									3,248,717	2,990,622	2,538,815
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Less: unallocated costs									$1,363,839	$1,312,712	$1,177,319

Segment_Information_Revenues_A

Segment Information (Revenues And Long-Lived Assets By Geographic Area) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Geographic Areas, Revenues
Revenues	$2,742,230	$2,581,009	$2,517,094	$2,422,348	$2,355,488	$2,305,723	$2,161,240	$2,020,738	$10,262,681	$8,843,189	$7,346,472
Geographic Areas, Long-Lived Assets
Long-lived assets	1,247,205				1,081,164				1,247,205	1,081,164	971,486
North America [Member]
Geographic Areas, Revenues
Revenues									7,879,785	6,860,067	5,836,258
Geographic Areas, Long-Lived Assets
Long-lived assets	188,277				48,352				188,277	48,352	52,149
Europe [Member]
Geographic Areas, Revenues
Revenues									1,883,590	1,579,205	1,195,490
Geographic Areas, Long-Lived Assets
Long-lived assets	29,816				22,707				29,816	22,707	8,696
United Kingdom [Member]
Geographic Areas, Revenues
Revenues									1,099,178	942,579	764,936
Rest of World [Member]
Geographic Areas, Revenues
Revenues									499,306	403,917	314,724
Geographic Areas, Long-Lived Assets
Long-lived assets	$1,029,112				$1,010,105				$1,029,112	$1,010,105	$910,641

Quarterly_Financial_Data_Unaud2

Quarterly Financial Data (Unaudited) (Summary Of Quarterly Financial Data) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Revenues	$2,742,230	$2,581,009	$2,517,094	$2,422,348	$2,355,488	$2,305,723	$2,161,240	$2,020,738	$10,262,681	$8,843,189	$7,346,472
Cost of Services, Excluding Depreciation, Depletion, and Amortization	1,639,384	1,569,828	1,499,462	1,432,444	1,411,155	1,382,336	1,272,013	1,199,965	6,141,118	5,265,469	4,278,241
Selling, general and administrative expenses	562,622	506,019	482,985	485,395	450,503	443,376	420,526	413,204	2,037,021	1,727,609	1,557,646
Depreciation and amortization expense	60,816	47,649	46,726	44,473	45,989	42,652	41,898	41,662	199,664	172,201	149,089
Income from operations	479,408	457,513	487,921	460,036	447,841	437,359	426,803	365,907	1,884,878	1,677,910	1,361,496
Net income	$362,857	$355,624	$371,908	$348,878	$324,332	$319,627	$300,410	$284,209	$1,439,267	$1,228,578	$1,051,263
Basic earnings per share	$0.60	$0.58	$0.61	$0.57	$0.54	$0.53	$0.50	$0.47	$2.37	$2.03	$1.74
Diluted earnings per share	$0.59	$0.58	$0.61	$0.57	$0.53	$0.53	$0.49	$0.47	$2.35	$2.02	$1.72

Valuation_And_Qualifying_Accou1

Valuation And Qualifying Accounts (Valuation And Qualifying Accounts) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable Allowance For Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$26,824	$25,816	$24,658
Charged to Costs and Expenses	4,675	3,571	5,051
Charged to Other Accounts	6,170	0	0
Deductions/Other	744	2,563	3,893
Balance at End of Period	36,925	26,824	25,816
Warranty Accrual [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	17,699	14,840	12,291
Charged to Costs and Expenses	24,943	20,327	17,063
Charged to Other Accounts	0	0	0
Deductions/Other	21,394	17,468	14,514
Balance at End of Period	21,248	17,699	14,840
Valuation Allowance - Deferred Income Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	5,659	6,288	10,365
Charged to Costs and Expenses	229	3,974	1,399
Charged to Other Accounts	5,565	0	0
Deductions/Other	33	4,603	5,476
Balance at End of Period	$11,420	$5,659	$6,288