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Statement Location [Axis] Statement of Income Location, Balance [Axis] Performance Shares, Granted in 2025 Performance Shares, Granted in 2025 [Member] Performance Shares, Granted in 2025 Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Common Stock  Common Stock [Member] Measure: Measure [Axis] 2028 Contractual Obligation, to be Paid, Year Three Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Line of Credit Line of Credit [Member] Entity Emerging Growth Company Entity Emerging Growth Company Mobile Mobile [Member] Mobile [Member] Shares withheld related to net share settlement (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Entity Central Index Key Entity Central Index Key Conversion price (in USD per share) Debt Instrument, Capped Call, Conversion Price Debt Instrument, Capped Call, Conversion Price General and administrative General and Administrative Expense [Member] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Expected Dividend Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Schedule of Accounts Payable and Accrued Expenses Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Equity Component [Domain] Equity Component [Domain] Preferred stock, par value (usd per share) Preferred Stock, Par or Stated Value Per Share Operating lease not yet commenced, term of contract Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract Reduction of interest rate Debt Instrument, Interest Rate, Increase (Decrease) Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Title Trading Arrangement, Individual Title One Buyer One Buyer [Member] One Buyer Statement [Table] Statement [Table] Contractual interest expense Interest expense Interest Expense, Debt Measurement Frequency [Domain] Measurement Frequency [Domain] Non-cash financing activity related to Amendment No. 2 to the 2024 Credit Agreement Noncash or Part Noncash, Financing Activity Noncash or Part Noncash, Financing Activity Geographic Concentration Risk Geographic Concentration Risk [Member] City Area Code City Area Code Current liabilities: Liabilities, Current [Abstract] CTV Connected Television [Member] Connected Television Accounts payable—seller Accounts Payable, Seller, Current Description of balance sheet netting of assets and liabilities per ASC 210-20. Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Gross property and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] TOTAL CURRENT ASSETS Assets, Current Summary of Interest Expense and Interest Income Interest Income and Interest Expense Disclosure [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Available borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Purchase of treasury stock Payments for Repurchase of Common Stock Exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number 2028 Long-Term Debt, Maturity, Year Three Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Debt, non-current, net of debt discount and debt issuance costs Debt, non-current, net of debt discount and debt issuance costs Debt, net of debt discount and debt issuance costs Long-Term Debt, Excluding Current Maturities Financial Standby Letter of Credit Financial Standby Letter of Credit [Member] Weighted-Average Grant Date Fair Value Weighted-Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Grant date fair value of options granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Total future undiscounted lease payments under leases not yet commenced Unrecorded Unconditional Purchase Obligation Other intangible assets Other Intangible Assets [Member] Income Taxes Income Tax Disclosure [Text Block] Retirement of common stock Stock Repurchased and Retired During Period, Value Credit Agreements, 2021 and 2024 Credit Agreements, 2021 And 2024 [Member] Credit Agreements, 2021 And 2024 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Net loss per share: Earnings Per Share [Abstract] Accumulated deficit Retained Earnings (Accumulated Deficit) Retirement of common stock (in shares) Stock Repurchased and Retired During Period, Shares Alternate Base Rate Alternate Base Rate [Member] Alternate Base Rate Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Debt issuance costs, gross Debt issuance costs Debt Issuance Costs, Gross Schedule of Debt Schedule of Debt [Table Text Block] General and administrative General and Administrative Expense Deferred income taxes Deferred Income Taxes and Tax Credits 2027 Long-Term Debt, Maturity, Year Two Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Discount rate Operating Lease, Weighted Average Discount Rate, Percent Lease liabilities—total (discounted) Operating Lease, Liability Debt fees Debt Instrument, Fee Amount Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Underlying Securities Award Underlying Securities Amount Unvested performance stock units Performance Shares Units Performance Shares [Member] Credit Facility [Axis] Credit Facility [Axis] Amendment Flag Amendment Flag Deferred Financing Costs Deferred Financing Costs [Member] Deferred Financing Costs Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Term loan fair value Long-Term Debt, Fair Value Entity Registrant Name Entity Registrant Name Debt Issuance Costs [Axis] Debt Issuance Costs [Axis] Debt Issuance Costs Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Remaining 2025 Amortization Of Debt Discount (Premium), Remainder Of Fiscal Year Amortization Of Debt Discount (Premium), Remainder Of Fiscal Year Depreciation and amortization Depreciation, Depletion and Amortization Intangible Assets Intangible Assets Disclosure [Text Block] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Fair Value as of Grant Date Award Grant Date Fair Value Total Unamortized debt issuance costs Total Debt Issuance Costs, Net Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Debt Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Geographical [Domain] Geographical [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Aggregate principle amount Debt Instrument, Face Amount Summary of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Schedule of Stock Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Debt Issuance Costs [Domain] Debt Issuance Costs [Domain] Debt Issuance Costs [Domain] Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Concentration Risk Type [Axis] Concentration Risk Type [Axis] Common stock, $0.00001 par value; 500,000 shares authorized at March 31, 2025 and December 31, 2024; 141,476 and 141,427 shares issued and outstanding at March 31, 2025 and December 31, 2024 Common Stock, Value, Issued Net basis Net Revenue [Member] Net Revenue Operating lease right-of-use assets reduction and corresponding non-cash adjustment to operating lease liabilities Operating Lease Right-Of-Use Assets Reduction And Adjustment To Operating Lease Liabilities From Lease Terminations Operating Lease Right-Of-Use Assets Reduction And Adjustment To Operating Lease Liabilities From Lease Terminations Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Effective interest rate Debt Instrument, Interest Rate During Period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Performance Shares, Granted in 2023 Performance Shares, Granted in 2023 [Member] Performance Shares, Granted in 2023 Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Thereafter Long-Term Debt, Maturity, After Year Four Long-Term Debt, Maturity, After Year Four Threshold trading days Debt Instrument, Convertible, Threshold Trading Days Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Canceled (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Loss on extinguishment of debt Gain (loss) on debt extinguishment Gain (Loss) on Extinguishment of Debt FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] 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] Preferred stock, $0.00001 par value, 10,000 shares authorized at March 31, 2025 and December 31, 2024; 0 shares issued and outstanding at March 31, 2025 and December 31, 2024 Preferred Stock, Value, Issued Shares Under Option Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] ESPP shares Employee Stock Employee Stock [Member] Basic (in dollars per share) Basic net loss per share (in dollars per share) Earnings Per Share, Basic Cash paid for amounts included in lease liabilities Operating Lease, Payments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Total Contractual Obligation 2026 Contractual Obligation, to be Paid, Year One Capitalized assets financed by accounts payable and accrued expenses and other liabilities Capital Expenditures Incurred but Not yet Paid Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] TOTAL CURRENT LIABILITIES Liabilities, Current 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] Weighted average shares used to compute net loss per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Unrecognized employee stock-based compensation Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount TOTAL ASSETS Assets Expected volatility of Magnite Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Cost of revenue Cost of Goods and Services Sold Debt outstanding Long-Term Line of Credit Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Payment terms in days (or less) Revenue, Payment Terms Revenue, Payment Terms Conversion Term (ii) Conversion Term (ii) [Member] Conversion Term (ii) Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Other liabilities, non-current Other Liabilities, Noncurrent Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Commitments and contingencies (Note 11) Commitments and Contingencies Performance Shares, Granted in 2024 Performance Shares, Granted in 2024 [Member] Performance Shares, Granted in 2024 Termination Date Trading Arrangement Termination Date Amortization of deferred financing costs Amortization of Other Deferred Charges Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Threshold percent of stock price trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 2026 Long-Term Debt, Maturity, Year One Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Entity Address, City or Town Entity Address, City or Town Over-allotment options Debt Instrument, Over-Allotment Options Debt Instrument, Over-Allotment Options Debt Instrument [Axis] Debt Instrument [Axis] Schedule of Share-based Compensation, Stock Options, Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Intrinsic values of options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value Total stock-based compensation expense Share-Based Payment Arrangement, Expense Convertible notes Convertible Debt, Fair Value Disclosures Net loss Net loss Net loss Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Amortization of debt discount Amortization of Debt Discount (Premium) Other Commitments [Table] Other Commitments [Table] Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Canceled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Quarterly payments of principle balance (percent) Debt Instrument, Periodic Payment, Percentage Of Principal Debt Instrument, Periodic Payment, Percentage Of Principal Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Remaining 2025 Amortization Of Debt Issuance Costs, Remainder Of Fiscal Year Amortization Of Debt Issuance Costs, Remainder Of Fiscal Year Performance Shares, Granted in 2022 Performance Shares, Granted in 2022 [Member] Performance Shares, Granted in 2022 Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Entity File Number Entity File Number Revenue Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Product Concentration Risk Product Concentration Risk [Member] Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Entity Address, Address Line Two Entity Address, Address Line Two Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] EFFECT OF EXCHANGE RATE CHANGES ON CASH, CASH EQUIVALENTS AND RESTRICTED CASH Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Term of lease contract Lessee, Operating Lease, Term of Contract Name Forgone Recovery, Individual Name Remaining 2025 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Exercisable at period end Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Remaining lease term Operating Lease, Weighted Average Remaining Lease Term Document Period End Date Document Period End Date Adam Soroca [Member] Adam Soroca Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Total lease payments (undiscounted) Lessee, Operating Lease, Liability, to be Paid Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Insider Trading Arrangements [Line Items] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Adjustment to Compensation: Adjustment to Compensation [Axis] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Conversion Term (i) Conversion Term (i) [Member] Conversion Term (i) Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Customer [Domain] Customer [Domain] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Accumulated Deficit Retained Earnings [Member] Amortization of debt issuance costs Amortization of debt issuance costs Amortization of Debt Issuance Costs Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Basic (in shares) Weighted-average common shares outstanding used to compute net loss per share (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Other income Other Operating Income Schedule Of Right-Of-Use Assets By Geographical Location Schedule Of Right-Of-Use Assets By Geographical Location [Table Text Block] Schedule Of Right-Of-Use Assets By Geographical Location Unvested restricted stock units Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Amortization of debt discount and issuance costs Amortization of Debt Issuance Costs and Discounts Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Expected correlation coefficients of Magnite Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficients Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficients Name Awards Close in Time to MNPI Disclosures, Individual Name Desktop Desktop [Member] Desktop [Member] Entity Filer Category Entity Filer Category Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Letter of Credit Letter of Credit [Member] Company Selected Measure Name Company Selected Measure Name