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Disclosure Details Of Common Stock Shares Available For Future Issuance [Table] Disclosure Details Of Common Stock Shares Available For Future Issuance [Table] Disclosure Details Of Common Stock Shares Available For Future Issuance. 12 Months or Greater, Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Accumulated Other Comprehensive Income/(Loss) Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Deferred cost of revenue, long-term Deferred Costs, Noncurrent Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Common Class A Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Long-term Debt Long-Term Debt [Member] Net loss attributable to noncontrolling interest Less: net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Total comprehensive loss attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Other Balance Sheet Components Other Balance Sheet Components [Text Block] Other Balance Sheet Components. Debt instrument, redemption terms, threshold percentage of principal amount outstanding Debt Instrument, Redemption Terms, Threshold Percentage Of Principal Amount Outstanding Debt Instrument, Redemption Terms, Threshold Percentage Of Principal Amount Outstanding Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Other Liabilities, Current Other assets Other Assets, Noncurrent Document Type Document Type Payments related to business combinations, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value Debt instrument, redemption price, percentage Debt Instrument, Redemption Price, Percentage Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Share repurchase program, remaining authorized, amount Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Deferred revenue—net of current portion Contract with Customer, Liability, Noncurrent Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Less than 12 Months, Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 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NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount U.S. agency securities US Government Agencies Debt Securities [Member] Prepayments for purchase of equipment and construction in progress Prepayment For Purchase Of Equipment And Construction In Progress [Member] Prepayment For Purchase Of Equipment And Construction In Progress Percentage of principal amount of debt redeemed (up to) Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Lessee term Lessee, Operating Lease, Term of Contract Minority interest percentage in joint venture Subsidiary, Ownership Percentage, Noncontrolling Owner PEO Name PEO Name Geographical [Axis] Geographical [Axis] PSU target number of shares (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Target Number Of Shares Share-based Compensation Arrangement by Share-based Payment Award, Target Number Of Shares Schedule of Short-term Debt [Table] Short-Term Debt [Table] Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Mutual funds Mutual Fund [Member] Liability Class [Axis] Liability Class [Axis] Other Commitments [Line Items] Other Commitments [Line Items] Product Concentration Risk Product Concentration Risk [Member] Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Beginning of period End of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Accounts payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Maturities of investments Proceeds from Maturities, Prepayments and Calls of Short-Term Investments Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Organization and Description of Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Total comprehensive loss, including noncontrolling interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Equity method investment ownership percentage Equity Method Investment, Ownership Percentage Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Investment, Name [Domain] Investment, Name [Domain] Leases Lessee, Operating Leases [Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Net loss per share attributable to common stockholders, basic (in dollars per share) Net loss per share attributable to common stockholders, basic (in dollars per share) Earnings Per Share, Basic Schedule of Stock Option Activity Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Repurchases of common stock Payments for Repurchase of Common Stock Deferred revenue—current portion Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term debt, net Long-Term Debt, Excluding Current Maturities Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Share-based compensation arrangement by share-based payment award, target number of shares, performance measures of cumulative, percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Target Number Of Shares, Performance Measures Of Cumulative, Percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Target Number Of Shares, Performance Measures Of Cumulative, Percentage Accounts receivable—net of allowances Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Short-term Debt [Line Items] Short-Term Debt [Line Items] Fair Value Debt Securities, Available-for-Sale Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Percentage of Revenue Percentage of revenue Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Equity Awards Adjustments Equity Awards Adjustments [Member] CEO Long Term Performance Award CEO Long Term Performance Award [Member] Total liabilities and stockholders’ equity Liabilities and Equity Stock options outstanding Stock options outstanding Share-Based Payment Arrangement, Option [Member] Noncontrolling interest Equity, Attributable to Noncontrolling Interest Restricted Stock Units (“RSUs”) and Unregistered Restricted Stock Awards (“RSAs”) outstanding Restricted Stock Units (RSUs) and Restricted Stock Awards (RSAs) [Member] Restricted Stock Units (RSUs) and Restricted Stock Awards (RSAs) Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Plan Name [Axis] Plan Name [Axis] Class A and Class B Common Stock Class A And Class B Common Stock [Member] Class A and class B common stock. Accrued interest receivable Interest Receivable, Current Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Other long-term liabilities Increase (Decrease) in Other Noncurrent Liabilities Asia-Pacific, including Australia and New Zealand Asia-Pacific Including Australia And New Zealand [Member] Asia-Pacific, including Australia and New Zealand [member]. Other Balance Sheet Components [Abstract] Other Balance Sheet Components [Abstract] Other Balance Sheet Components. Purchases of intangible assets Payments to Acquire Intangible Assets Cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cancelled in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cancelled in Period Schedule of Accrued Expenses and Other Current Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Roblox China Holding Corp Roblox China Holding Corp [Member] Roblox China Holding Corp . Other income/(expense), net Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name Stockholders’ equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Purchases of investments Payments to Acquire Investments Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Aggregate Intrinsic Value (in millions) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value General and administrative General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Debt Instrument, redemption terms, prior notice period Debt Instrument, Redemption Terms, Prior Notice Period Debt Instrument, Redemption Terms, Prior Notice Period Debt instrument, term of maturity date extension Debt Instrument, Term Of Maturity Date Extension Debt Instrument, Term Of Maturity Date Extension Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Developer exchange fees Developer exchange fees Exchange Fees Adjustment to Compensation: Adjustment to Compensation [Axis] Amounts reclassified from accumulated other comprehensive income/(loss), net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Performance Stock Units (“PSUs”) 2022 Performance Stock Units [Member] 2022 Performance Stock Units Founder CEO Founder CEO [Member] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other adjustments Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Performance period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Performance Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Performance Period Cancelled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cancelled, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cancelled, Weighted Average Grant Date Fair Value Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Total, Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Short-term investments Short-Term Investments Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Investments, Debt and Equity Securities [Abstract] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Consolidated net loss Consolidated net loss Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Provision for/(benefit from) income taxes (Provision for)/benefit from income taxes Income Tax Expense (Benefit) Cost of revenue Cost of revenue Cost of Product and Service Sold Purchase obligation Purchase Obligation Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net increase/(decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net loss attributable to common stockholders Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Unamortized issuance costs Unamortized Debt Issuance Expense Statement [Table] Statement [Table] Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Accumulated Other Comprehensive Income/(Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Interest income Investment Income, Interest Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]