-Network: (11 - Statement - Statement Of Income Alternative)

-Income Statement [Abstract] {ID1}

-Statement [Table] {ID2}

-Statement [Line Items] {ID3}

Revenues {ID4}

-Operating expenses: {ID5}

Cost of revenues (exclusive of depreciation and amortization expense shown separately below) {ID6}

Selling, general and administrative expenses {ID7}

Depreciation and amortization expense {ID8}

Income from operations {ID9}

-Other income (expense), net: {ID10}

Interest income {ID11}

Other income (expense), net {ID12}

Total other income (expense), net {ID13}

Income before provision for income taxes {ID14}

Provision for income taxes {ID15}

Net income {ID16}

Basic earnings per share {ID17}

Diluted earnings per share {ID18}

Weighted average number of common shares outstanding {ID19}

Dilutive effect of shares issuable under stock-based compensation plans {ID20}

Weighted average number of common and dilutive shares outstanding {ID21}

-Comprehensive income: {ID22}

Net income {ID23}

Foreign currency translation adjustments {ID24}

Net unrealized gain on cash flow hedges, net of taxes of $660, $0, $274 and $0, respectively {ID25}

Unrealized loss on available-for-sale securities, net of taxes of $0, $229, $0 and $2,632, respectively {ID26}

Total comprehensive income {ID27}

-Network: (12 - Statement - Statement Of Income Alternative (Parenthetical))

-Income Statement [Abstract] {ID28}

-Statement [Table] {ID29}

-Statement [Line Items] {ID30}

Net unrealized gain on cash flow hedges, taxes {ID31}

Unrealized loss on available-for-sale securities, taxes {ID32}

-Network: (13 - Statement - Statement Of Financial Position Classified)

-Statement of Financial Position [Abstract] {ID33}

-Statement [Table] {ID34}

-Statement [Line Items] {ID35}

-Assets {ID36}

-Current assets: {ID37}

Cash and cash equivalents {ID38}

Short-term investments {ID39}

Trade accounts receivable, net of allowances of $14,037 and $13,441, respectively {ID40}

Unbilled accounts receivable {ID41}

Deferred income tax assets, net {ID42}

Other current assets {ID43}

Total current assets {ID44}

Property and equipment, net of accumulated depreciation of $234,533 and $199,188, respectively {ID45}

Long-term investments {ID46}

Goodwill {ID47}

Intangible assets, net {ID48}

Deferred income tax assets, net {ID49}

Other assets {ID50}

Total assets {ID51}

-Liabilities and Stockholders' Equity {ID52}

-Current liabilities: {ID53}

Accounts payable {ID54}

Deferred revenue {ID55}

Accrued expenses and other current liabilities {ID56}

Total current liabilities {ID57}

Deferred income tax liabilities, net {ID58}

Other noncurrent liabilities {ID59}

Total liabilities {ID60}

Commitments and contingencies (See Note 7) {ID61}

-Stockholders' equity: {ID62}

Preferred stock, $.10 par value, 15,000 shares authorized, none issued {ID63}

Class A common stock, $.01 par value, 500,000 shares authorized, 293,169 and 291,670 shares issued and outstanding at June 30, 2009 and December 31, 2008, respectively {ID64}

Additional paid-in capital {ID65}

Retained earnings {ID66}

Accumulated other comprehensive income (loss) {ID67}

Total stockholders' equity {ID68}

Total liabilities and stockholders' equity {ID69}

-Network: (14 - Statement - Statement Of Financial Position Classified (Parenthetical))

-Statement of Financial Position [Abstract] {ID70}

-Statement [Table] {ID71}

-Statement [Line Items] {ID72}

Trade accounts receivable, allowances {ID73}

Property and equipment, accumulated depreciation {ID74}

Preferred stock, par value {ID75}

Preferred stock, shares authorized {ID76}

Preferred stock, issued {ID77}

Class A common stock, par value {ID78}

Class A common stock, shares authorized {ID79}

Class A common stock, shares issued {ID80}

Class A common stock, shares outstanding {ID81}

-Network: (15 - Statement - Statement Of Cash Flows Indirect)

-Statement of Cash Flows [Abstract] {ID82}

-Statement [Table] {ID83}

-Statement [Line Items] {ID84}

-Cash flows from operating activities: {ID85}

Net income {ID86}

-Adjustments to reconcile net income to net cash provided by operating activities: {ID87}

Depreciation and amortization {ID88}

Provision for doubtful accounts {ID89}

Deferred income taxes {ID90}

Stock-based compensation expense {ID91}

Excess tax benefit on stock-based compensation arrangements {ID92}

Other {ID93}

-Changes in assets and liabilities: {ID94}

Trade accounts receivable {ID95}

Other current assets {ID96}

Other assets {ID97}

Accounts payable {ID98}

Other current and noncurrent liabilities {ID99}

Net cash provided by operating activities {ID100}

-Cash flows from investing activities: {ID101}

Purchases of property and equipment {ID102}

Purchases of investments {ID103}

Proceeds from maturity or sale of investments {ID104}

Acquisitions, net of cash acquired {ID105}

Net cash (used in) provided by investing activities {ID106}

-Cash flows from financing activities: {ID107}

Issuance of common stock under employee stock plans {ID108}

Excess tax benefit on stock-based compensation arrangements {ID109}

Repurchases of common stock {ID110}

Net cash provided by financing activities {ID111}

Effect of currency translation on cash and cash equivalents {ID112}

Increase in cash and cash equivalents {ID113}

Cash and cash equivalents, beginning of year {ID114}

Cash and cash equivalents, end of period {ID115}

-Network: (16 - Disclosure - Notes to Financial Statements)

-Notes to Financial Statements [Abstract] {ID116}

Note 1 - Interim Condensed Consolidated Financial Statements {ID117}

Note 2 - Investments {ID118}

Note 3 - Stock Repurchase Program {ID119}

Note 4 - Income Taxes {ID120}

Note 5 - Fair Value Measurements {ID121}

Note 6 - Derivative Financial Instruments {ID122}

Note 7 - Commitments and Contingencies {ID123}

Note 8 - Segment Information {ID124}

Note 9 - Recent Accounting Pronouncements {ID125}

-Network: (17 - Disclosure - Document Information)

-Document Information [Text Block] {ID126}

Document Type {ID127}

Amendment Flag {ID128}

Amendment Description {ID129}

Document Period End Date {ID130}

-Network: (18 - Disclosure - Entity Information)

-Entity [Text Block] {ID131}

Trading Symbol {ID132}

Entity Registrant Name {ID133}

Entity Central Index Key {ID134}

Current Fiscal Year End Date {ID135}

Entity Well-known Seasoned Issuer {ID136}

Entity Current Reporting Status {ID137}

Entity Voluntary Filers {ID138}

Entity Filer Category {ID139}

Entity Common Stock, Shares Outstanding {ID140}

Entity Public Float {ID141}

COGNIZANT TECHNOLOGY SOLUTIONS CORP XBRL Taxonomy Presentation Networks