Document and Entity Information [Abstract] Document and Entity Information [Abstract] Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Legal Entity [Axis] Entity [Domain] Parent Company [Member] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Trading Symbol Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Income (Loss) Attributable to Parent Net income Net income Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization Depreciation, Depletion and Amortization, Total Stock-based compensation, excluding amounts capitalized Share-based Compensation, Total Excess tax benefits from stock-based compensation Excess tax benefits from stock-based compensation Excess tax benefits from stock-based compensation Other Changes in assets and liabilities, net of acquisitions: Accounts receivable Other assets Due To From Emc Net Due To From Emc Net Due to/from EMC, net Accounts payable Increase (Decrease) in Accounts Payable, Total Increase (Decrease) in Accrued Liabilities Accrued expenses Increase (Decrease) in Accrued Liabilities, Total Income taxes receivable from EMC Income taxes payable Deferred income taxes, net Deferred revenue Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Cash flows from investing activities: Additions to property and equipment Additions to property and equipment Payments to Acquire Property, Plant, and Equipment, Total Capitalized Computer Software Additions Capitalized software development costs Capitalized software development costs Purchases of available-for-sale securities Purchases of available-for-sale securities Payments to Acquire Available-for-sale Securities, Total Payments to Acquire Other Investments Purchase of strategic investments Purchase of strategic investments Business acquisitions, net of cash acquired Business acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Transfer Of Net Assets Under Common Control Transfer of net assets under common control Increase in restricted cash Decrease in restricted cash Increase (Decrease) in Restricted Cash, Total Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Cash flows from financing activities: Proceeds from issuance of common stock Repurchase of common stock Repurchase of common stock Excess Tax Benefit From Share Based Compensation Financing Activities Excess tax benefits from stock-based compensation Shares repurchased for tax withholdings on vesting of restricted stock Shares repurchased for tax withholdings on vesting of restricted stock Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash and cash equivalents Cash and cash equivalents Cash and cash equivalents at end of the period Cash and cash equivalents at beginning of the period Cash and cash equivalents Non-cash items: Changes in capital additions, accrued but not paid Changes in capital additions, accrued but not paid Statement, Scenario [Axis] Scenario, Unspecified [Domain] Income Statement [Abstract] Statement, Operating Activities Segment [Axis] Segment, Operating Activities [Domain] Revenues: License Services Sales Revenue, Services, Net, Total Revenues Revenues, Total Operating expenses (1): Cost of license revenues Cost of services revenues Cost of Services, Total Research and development Research and Development Expense, Total Sales and marketing Selling and Marketing Expense, Total General and administrative General and Administrative Expense, Total Operating Income (Loss) Operating income Investment income Investment Income, Net, Total Interest expense with EMC, net Interest expense with EMC, net Interest Expense, Debt, Total Other income (expense), net Other Nonoperating Income (Expense), Total Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest Income before income taxes Income tax provision Income Tax Expense (Benefit), Total Net income per weighted-average share, basic for Class A and Class B Earnings Per Share, Basic, Total Net income per weighted-average share, diluted for Class A and Class B Earnings Per Share, Diluted, Total Weighted-average shares, basic for Class A and Class B Weighted Average Number of Shares Outstanding, Basic, Total Weighted-average shares, diluted for Class A and Class B Weighted Average Number of Shares Outstanding, Diluted, Total Consolidated Statements of Income Consolidated Statements of Income [Abstract] Cost Of License Revenues Cost Of License Revenues [Member] Cost Of Services Revenues Cost Of Services Revenues [Member] Research and Development Research and Development [Member] Sales and Marketing Sales and Marketing [Member] General and Administrative General and Administrative [Member] Stock-based Compensation Allocated Share-based Compensation Expense, Total Statement of Financial Position [Abstract] Assets Abstract ASSETS Short-term investments Short-term investments Accounts receivable, net Accounts receivable, less allowance for doubtful accounts Due from EMC, net Due from Related Parties, Current, Total Deferred tax asset, current portion Deferred Tax Assets, Net, Current, Ending Balance Deferred Tax Assets, Net, Current, Beginning Balance Deferred Tax Assets, Net, Current, Total Other current assets Assets, Current Total current assets Property and equipment, net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property and equipment, net Capitalized software development costs, net and other Capitalized software development costs, net and other Capitalized software development costs, net and other Deferred tax asset, net of current portion Deferred Tax Assets, Net, Noncurrent, Total Intangible assets, net Intangible assets, net Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Assets Total assets Liabilities And Stockholders Equity Abstract LIABILITIES AND STOCKHOLDERS' EQUITY Accounts Payable Current Accounts payable Accounts Payable, Current, Total Accrued Liabilities Current Accrued expenses and other Accrued Liabilities, Current, Total Deferred revenue, current portion Deferred Revenue, Current, Total Liabilities, Current Total current liabilities Notes Payable Related Parties Noncurrent Note payable to EMC Deferred revenue, net of current portion Deferred Revenue, Noncurrent, Total Deferred tax liability Other liabilities Other Liabilities, Noncurrent, Total Liabilities Total liabilities Commitments and contingencies (see Note K) Stockholders' equity: Common stock, Value Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Additional paid-in capital Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated other comprehensive income Retained earnings Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained earnings Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Parent, Ending Balance Stockholders' Equity Attributable to Parent, Beginning Balance Total stockholders' equity Liabilities and Stockholders' Equity Total liabilities and stockholders' equity Statement of Stockholders' Equity [Abstract] Scenario, Actual [Member] Common stock, par value Common stock, shares authorized Common stock, shares issued Common Stock, Shares, Issued, Total Common stock, shares outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Overview and Basis of Presentation [Abstract] Overview and Basis of Presentation [Abstract] Overview and Basis of Presentation General Policies [Abstract] Significant Accounting Policies Earnings Per Share [Abstract] Earnings per Share Investments [Abstract] Available-for-sale Securities [Text Block] Investments Fair Value Measurements and Derivative Instruments [Abstract] Fair Value Measurements and Derivative Instruments [Abstract] Fair Value Measurements and Derivative Instruments Business Acquisitions and Goodwill [Abstract] Business Acquisitions and Goodwill [Abstract] Business Acquisitions and Goodwill Property, Plant and Equipment [Abstract] Property and Equipment, Text Block Property and Equipment, Net Accrued Liabilities [Abstract] ScheduleOfAccruedExpensesTextBlock ScheduleOfAccruedExpensesTextBlock Accrued Expenses Note Payable to EMC [Abstract] Note Payable to EMC [Abstract] Note Payable to EMC Income Tax Expense (Benefit) [Abstract] Income Taxes Commitments and Contingencies [Abstract] Commitments and Contingencies [Abstract] Commitments and Contingencies Stockholders' Equity Note [Abstract] Stockholders' Equity Comprehensive Income Note [Abstract] Comprehensive Income Related Party Transaction, Due from (to) Related Party [Abstract] dup_1_Related Party Transaction, Due from (to) Related Party, Noncurrent, Total Related Party Transactions Segment Information [Abstract] Segment Information [Abstract] Segment Information Class A common stock Class B convertible common stock