Products Services and support Total revenue Products Services and support Total cost of revenue Gross profit Sales and marketing General and administrative Restructuring charges Amortization of purchased intangibles Total operating expenses Operating income Interest expense Investment gains (losses), net Income before income taxes Provision for income taxes Net income Basic net income per share Shares used in computing basic net income per share Diluted net income per share Shares used in computing diluted net income per share Cash and cash equivalents Short-term investments Trade receivables, net of allowances for doubtful accounts of $6,153 and $4,128, respectively Allowances for doubtful accounts Deferred income taxes Prepaid expenses and other assets Prepaid expenses other assets Prepaid expenses and other current assets Total current assets Property and equipment, net Purchased and other intangibles, net Other assets Total assets Total current liabilities Deferred revenue Debt Deferred revenue Deferred income taxes Other liabilities Total liabilities Preferred stock, $0.0001 par value; 2,000 shares authorized, none issued Common stock, $0.0001 par value; 900,000 shares authorized; 600,834 shares issued; 524,665 and 526,111 shares outstanding, respectively Additional paid-in-capital Retained earnings Total accumulated other comprehensive income, net of taxes Treasury stock, at cost (76,169 and 74,723 shares, respectively), net of reissuances Total stockholders' equity Total liabilities and stockholders' equity Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares issued Common stock, par value Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Depreciation, amortization and accretion Stock-based compensation Excess tax benefits from stock-based compensation Deferred revenue Net cash provided by operating activities Purchases of short-term investments Proceeds from sales of short-term investments Purchases of property and equipment Net cash used for investing activities Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Net increase in cash and cash equivalents Effect of foreign currency exchange rates on cash and cash equivalents Net cash used for financing activities Proceeds from issuance of treasury stock Purchases of treasury stock Excess tax benefits from stock-based compensation Cash paid for interest Cash paid for income taxes, net of refunds Prepaid expenses and other current assets Accrued expenses Total non-operating income (expense), net Accrued restructuring, noncurrent Accrued restructuring Expenses, Noncurrent Accrued restructuring Income taxes payable Treasury stock, shares Summary of Significant Accounting Policies Goodwill and Purchased and Other Intangibles Restructuring Charges Stock-Based Compensation Comprehensive Income (Loss) Commitments and Contingencies Financial Instruments Segments Income taxes payable Trade receivables Trade payables Research and development Proceeds from sale of long-term investments Non-Operating Income (Expense) Balance Sheets Parenthetical Information Balance Sheets (Parenthetical) [Abstract] Accrued restructuring Other Assets Credit Agreement Beginning Balance Ending Balance Interest and other income, net Deferred income taxes Repayments of borrowings under credit facility Accrued Restructuring Expenses Current Accrued restructuring Expenses, Current Accrued restructuring SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Significant Accounting Policies [Abstract] FINANCIAL INSTRUMENTS Financial Instruments [Abstract] GOODWILL AND PURCHASED AND OTHER INTANGIBLES Goodwill and Purchased and Other Intangibles [Abstract] ACCRUED EXPENSES Accrued Expenses [Abstract] NET INCOME PER SHARE Net Income Per Share [Abstract] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies [Abstract] CREDIT AGREEMENT Credit Agreement [Abstract] Investment in lease receivable. Investment in lease receivable Retirements of property and equipment Provision for losses on trade receivables SEGMENTS Segments [Abstract] Net Income Per Share Statements of Income. Statements of Income [Abstract] Non-Operating Income (Expense) [Abstract] Operating expenses: Total cost of revenue: Revenue: Balance Sheets. Balance Sheets [Abstract] Liabilities and Stockholders' Equity Assets Stockholders equity [Abstract] Long-term liabilities: Current liabilities: Current assets: Statements Of Cash Flows Statements of Cash Flows [Abstract] Supplemental disclosures: Cash flows from financing activities: Cash flows from investing activities: Cash flows from operating activities: Changes in operating assets and liabilities, net of acquired assets and liabilities: Summary of Significant Accounting Policies [Abstract] Financial Instruments [Abstract] Goodwill and Purchased and Other Intangibles [Abstract] Accrued Expenses [Abstract] Commitments and Contingencies [Abstract] Credit Agreement [Abstract] Investment in lease receivable Prepaid expenses and other assets Accrued restructuring Accrued restructuring Balance Sheets [Abstract] Balance Sheets (Parenthetical) [Abstract] Statements of Income [Abstract] Statements of Cash Flows [Abstract] Summary of Significant Accounting Policies [Abstract] Financial Instruments [Abstract] Goodwill and Purchased and Other Intangibles [Abstract] Accrued Expenses [Abstract] Net Income Per Share [Abstract] Commitments and Contingencies [Abstract] Credit Agreement [Abstract] Segments [Abstract] Reconciliation Balances for Investments of Limited Partnership Purchased and Other Intangible Assets Current Year Other Assets Restructuring Activities Comprehensive Income Segment Reporting (Three Months Ended) Stock-Based Compensation Trade receivables, net of allowances for doubtful accounts of $6,153 and $4,128, respectively Total current assets Common stock, $0.0001 par value; 900,000 shares authorized; 600,834 shares issued; 524,665 and 526,111 shares outstanding, respectively Common Stock, Value, Beginning Balance Common Stock, Value, Ending Balance Treasury Stock, Value, Beginning Balance Treasury Stock, Value, Ending Balance Assets Current assets: Cash and cash equivalents Short-term investments Deferred income taxes Property and equipment, net Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Purchased and other intangibles, net Liabilities and Stockholders' Equity Current liabilities: Total current liabilities Long-term liabilities: Debt Deferred revenue Income taxes payable Deferred income taxes Total liabilities Stockholders' equity [Abstract] Preferred stock, $0.0001 par value; 2,000 shares authorized, none issued Preferred Stock, Value, Beginning Balance Preferred Stock, Value, Ending Balance Additional paid-in-capital Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Ending Balance Retained earnings Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Revenue: Products Services and support Cost of revenue: Products Gross profit Operating expenses: Research and development Sales and marketing General and administrative Restructuring charges Operating income Non-operating income (expense): Interest and other income, net Interest expense Income before income taxes Cash flows from operating activities: Net income Depreciation, amortization and accretion Stock-based compensation Deferred income taxes Retirements of property and equipment Provision for losses on trade receivables Excess tax benefits from stock-based compensation Changes in operating assets and liabilities, net of acquired assets and assumed liabilities: Trade receivables Prepaid expenses and other current assets Trade payables Accrued expenses Accrued expenses Accrued restructuring Income taxes payable Cash flows from investing activities: Purchases of short-term investments Proceeds from sales of short-term investments Purchases of property and equipment Proceeds from sale of long-term investments Proceeds from sale of long-term investments Cash flows from financing activities: Purchases of treasury stock Proceeds from issuance of treasury stock Excess tax benefits from stock-based compensation Repayments of borrowings under credit facility Other Supplemental disclosures: Allowances for doubtful accounts Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Allowance for Doubtful Accounts Receivable, Current, Ending Balance Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares issued Common stock, par value Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding, Ending Balance Treasury stock, shares Treasury Stock, Shares, Beginning Balance Treasury Stock, Shares, Ending Balance Summary of Significant Accounting Policies Financial Instruments Goodwill and Purchased and Other Intangibles Restructuring Charges Net Income Per Share Commitments and Contingencies Credit Agreement Non-Operating Income (Expense) Segments Net increase in cash and cash equivalents Purchases of long-term investments and other assets Purchases long-term investments other assets Purchases of long-term investments and other assets. Interest expense Interest Expense Treasury stock, at cost (76,169 and 74,723 shares, respectively), net of reissuances Treasury Stock, Value Treasury stock, at cost (76,304 and 74,723 shares, respectively), net of reissuances Purchases of short-term investments Payments to Acquire Short-term Investments Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Purchases of long-term investments and other assets Other Payments for (Proceeds from) Other Investing Activities Purchases of treasury stock Payments for Repurchase of Common Stock Repayments of borrowings under credit facility Repayments of Lines of Credit Acquisitions, net of cash acquired Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Other non-cash items Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities, Other Trade payables Trade payables Accounts Payable, Current Accrued expenses Total accrued expenses Accrued Liabilities, Current Income taxes payable Income taxes payable Accrued Income Taxes, Current Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Cash, Cash Equivalents and Short Term Investments [Abstract] Cash, Cash Equivalents and Short Term Investments [Abstract] Cash, Cash Equivalents and Short Term Investments. Schedule of Other Assets, Noncurrent [Text Block] Acquisitions [Abstract] Acquisitions [Abstract] Acquisitions. Acquisitions Business Combination Disclosure [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Employee Benefit Plan [Abstract] Employee Benefit Plan [Abstract] Employee Benefit Plan. Comprehensive Income Note [Text Block] Document and Company Information [Abstract] Document And Company Information [Abstract] Document And Company Information. Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Acquisitions, net of cash acquired Cash, Cash Equivalents and Short Term Investments (Table) [Abstract] Cash, Cash Equivalents and Short Term Investments (Table) [Abstract] Cash, Cash Equivalents and Short Term Investments. Cash, Cash Equivalents and Short-term Investments (Details) [Abstract] Cash, Cash Equivalents and Short-term Investments (Details) [Abstract] Cash, cash equivalents and short-term investments. Financial Instruments (Tables) [Abstract] Financial Instruments (Tables) [Abstract] Financial Instruments. Goodwill and Purchased and Other Intangibles (Tables) [Abstract] Goodwill and Purchased and Other Intangibles (Tables) [Abstract] Goodwill And Purchased And Other Intangibles. Goodwill and Purchased and Other Intangibles (Details) [Abstract] Goodwill and Purchased and Other Intangibles (Details) [Abstract] Goodwill and Purchased and Other Intangibles. Other Asset (Table) [Abstract] Other Asset (Table) [Abstract] Other assets. Other Assets (Details) [Abstract] Other Assets (Details) [Abstract] Other Assets. Accrued Expenses (Table) [Abstract] Accrued Expenses (Table) [Abstract] Accrued expenses. Accrued Expenses (Details) [Abstract] Accrued Expenses (Details) [Abstract] Accrued Expenses. Stock Based Compensation (Tables) [Abstract] Stock Based Compensation (Tables) [Abstract] Stock Based Compensation. Stock Based Compensation (Details) [Abstract] Stock Based Compensation (Details) [Abstract] Stock Based Compensation. Restructuring Charges (Tables) [Abstract] Restructuring Charges (Tables) [Abstract] Restructuring Charges. Restructuring Charges (Details) [Abstract] Restructuring Charges (Details) [Abstract] Restructuring Charges. Net Income Per Share (Tables) [Abstract] Net Income Per Share (Tables) [Abstract] Net Income Per Share. Net Income Per Share (Details) [Abstract] Net Income Per Share (Details) [Abstract] Net Income Per Share Details. Non-Operating Income (Expense) (Table) [Abstract] Non-Operating Income (Expense) (Table) [Abstract] Non Operating Income (Expense). Segments (Tables) [Abstract] Segments (Tables) [Abstract] Segments. Segments (Details) [Abstract] Segments (Details) [Abstract] Segments. Accrued Expenses Accrued Expenses Accrued expenses. Other Assets Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Text Block] Schedule of Finite-Lived Intangible Assets by Major Class [Text Block] Cash, Cash Equivalents and Short-term Investments Current Year Cash, Cash Equivalents and Short-term Investments Current Year Cash, cash equivalents and short-term investments. Cash, Cash Equivalents and Short-term Investments Prior Year Cash, Cash Equivalents and Short-term Investments Prior Year Cash, Cash Equivalents and Short-term Investments. Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities Current Year Available-for-sale Securities [Text Block] Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities Prior Year Cost and Estimated Fair Value of Debt Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Text Block] Segment Reporting (Nine Months Ended) Net Income Per Share Earnings Per Share [Text Block] Other Comprehensive Income, Net of Taxes Other Comprehensive Income, Net of Taxes Other comprehensive income (loss), net of taxes. Accumulated Other Comprehensive Income, Net of Taxes Accumulated Other Comprehensive Income, Net of Taxes Accumulated other comprehensive income, net of taxes. Financial Assets and Liabilities at Fair Value on Recurring Basis Current Year Financial Assets and Liabilities at Fair Value on Recurring Basis Prior Year Fair Value By Balance Sheet Grouping [Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Text Block] Fair Value of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Text Block] Schedule of Restructuring and Related Costs [Text Block] Non Operating Income Expense (Details) [Abstract] Non Operating Income Expense (Details) [Abstract] Non-Operating Income Expense. Assumptions Used to Value Option Grants Assumptions Used to Value Option Grants Assumptions Used To Value Option Grants. Assumptions Used to Value Employee Stock Purchase Rights Assumptions Used to Value Employee Stock Purchase Rights Assumptions Used to Value Employee Stock Purchase Rights. Stock Options Outstanding Stock Options Outstanding Stock Options Outstanding. Restricted Stock Unit Activity Restricted Stock Unit Activity Restricted Stock Unit Activity. Restricted Stock Units Outstanding Restricted Stock Units Outstanding Restricted Stock Units Outstanding. Performance Shares Outstanding Performance Shares Outstanding Performance Shares Outstanding. Total Stock-based Compensation Costs Nine Months Ended Total Stock-based Compensation Costs Nine Months Ended Total Stock Based Compensation Costs. Segment Reporting (Nine Months Ended) Segment Reporting (Nine Months Ended) This element may be used to capture the complete disclosure about the profit or loss and total assets for each reportable segment, as a single block of text. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. Purchased and Other Intangible Assets Prior Year Purchased and Other Intangible Assets Prior Year This block of text may be used to disclose all or part of the information related to intangible assets. Financial Assets and Liabilities at Fair Value on Recurring Basis Prior Year Financial Assets and Liabilities at Fair Value on Recurring Basis Prior Year This item represents the complete disclosure regarding the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the Company is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risk is are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities Prior Year Fair Value and Gross Unrealized Losses Related to Available-For-Sale Securities Prior Year This item represents the entire disclosure related to Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. Cost and Estimated Fair Value of Debt Securities [Abstract] Cost and Estimated Fair Value of Debt Securities [Abstract] Cost and Estimated Fair Value of Debt Securities. Total accrued expenses Amortization Expense in Future Periods [Abstract] Amortization Expense in Future Periods [Abstract] Amortization Expense in Future Periods. Restructuring Activities [Abstract] Restructuring Activities [Abstract] Restructuring Activities. Other Comprehensive Income, Net of Taxes [Abstract] Other Comprehensive Income (Loss), Net of Taxes [Abstract] Other Comprehensive Income (Loss), Net of Taxes. Financial Instruments (Details) [Abstract] Financial Instruments (Details) [Abstract] Financial Instruments. Other Assets [Abstract] Other Assets [Abstract] Other Assets. Accrued Expense [Abstract] Accrued Expense [Abstract] Accrued Expenses. Reconciliation Balances for Investments of Limited Partnership [Abstract] Reconciliation Balances for Investments of Limited Partnership [Abstract] Reconciliation Balances for Investments of Limited Partnership. Fair Value of Derivative Instruments [Abstract] Fair Value of Derivative Instruments [Abstract] Fair Value of Derivative Instruments.