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Schedule of Revenue Related Reserves Included in Consolidated Balance Sheets 9 O-H Risperidone Palimate [Member] 9 O-H Risperidone Palimate. O H Risperidone Palimate [Member] Represents royalty as a percentage of net sales under the collaborative agreements. Collaborative Arrangement Royalty Rate Royalty rate (as a percent) Goodwill and Intangible Assets Disclosure [Text Block] Intangible Assets and Goodwill Discounts [Member] Discounts. Discounts Statement of Financial Position Location, Balance [Axis] Balance Sheet Location Investment Type [Axis] Occupancy internal research and development expenses Occupancy internal research and development expenses. Occupancy Right-of-use asset Operating Lease, Right-of-Use Asset RIGHT-OF-USE ASSETS Number of investment securities. 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Base Premises [Member] Base Premises Document Type Document Type JPMorgan Chase Bank, N.A [Member] JPMorgan Chase Bank, N.A. JPMorgan Chase Bank, N.A Paid cash for income taxes, net of refunds received Income Taxes Paid, Net Income Taxes Paid, Net, Total Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative Entity Central Index Key Entity Central Index Key Entity Central Index Key Income taxes payable on repatriation of unremitted earnings. Income Taxes Payable On Repatriation Of Unremitted Earnings Income taxes payable on repatriation of unremitted earnings AmerisourceBergen Corporation. Amerisource Bergen Corporation [Member] AmerisourceBergen Investments, Debt and Equity Securities [Abstract] Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block] Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Subsequent Event Type [Domain] Subsequent Event Type Article or substance produced by labor or machinery, and royalties. 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Represents information pertaining to the license agreement included under the collaboration agreement. License Agreement [Member] License agreement External Research and Development expenses External research and development expenses. Total external R&D expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Accrued expenses and reserves Shares, Outstanding BALANCE (in shares) BALANCE (in shares) Operating Loss Carryforwards Operating loss carryforwards DEFERRED TAX ASSET Deferred tax asset Disposal Group, Including Discontinued Operation, Deferred Tax Assets Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state tax credit carryforwards. Deferred Tax Assets Tax Credit Carryforwards State State tax credits Royalty revenue related to back royalties Royalty Revenue Related to Back Royalties Royalty revenue related to back royalties. Represents the provision for extension of operating lease term. 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Deferred income taxes Continuing Operations Continuing Operations [Member] Current provisions relating to sales in current year Current Provisions Relating To Sales In Current Year Current provisions relating to sales in current year. Aggregate revenues, net, during the period in the normal course of business. Revenues Net [Member] Revenues Net Lessee, Lease, Description [Table] Lessee Lease Description [Table] Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Changes in valuation allowances (as a percent) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income (loss) Net income Liabilities related to discontinued operations Total current liabilities Disposal Group, Including Discontinued Operation, Liabilities, Current Returns Returns [Member] Returns. 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Other internal R&D expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Amount Meals and Entertainment Liabilities Total liabilities This element represents receipt of Alkermes' stock for the exercise of stock options or to satisfy minimum tax withholding obligations related to stock based awards. Receipt Of Company Stock For Exercise Of Stock Options Or To Satisfy Minimum Tax Withholding Obligations Related To Stock Based Awards Value Receipt of Alkermes' shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards Repayment Of Royalty Revenue Repayment Of Royalty Revenue Repayment of royalty revenue Financial Instruments [Domain] Financial Instruments Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Within 1 year Contract liabilities. Contract Liabilities [Member] Contract liabilities–short-term Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Within 1 year Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Number of years from the date of the grant Lessee, Operating Lease, Liability, to be Paid, Year Two 2027 Restricted Cash Restricted Cash, Total Restricted cash Disposal Groups, Including Discontinued Operations [Table] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Advertising Expense Advertising Expense Return of investment. Return Of Investments Return of Fountain Healthcare Partners II, L.P. investment Variable Rate [Axis] Tabular disclosure of net income or loss before provision for income taxes by geographical area of the entity. Schedule Of Net Income Loss Before Provision For Taxes By Geographical Area Table [Text Block] Schedule of Income Before Provision (Benefit) for Income Taxes by Geographical Area Contract Assets Contract assets policy. Contract Assets Policy Policy [Text Block] Finite-Lived Intangible Assets, Gross, Total Finite-Lived Intangible Assets, Gross Gross Carrying Amount Gross Unrealized Losses less than one year Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Shares used in calculating diluted earnings (loss) per ordinary share Weighted Average Number of Shares Outstanding, Diluted Diluted Shares used in calculating diluted earnings (loss) per ordinary share Entity File Number Entity File Number OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Unrealized gain (loss) on marketable securities, net of tax provision (benefit) Holding (loss) gain, net of a tax (benefit) provision of $(55), $292, and $1,195, respectively Alternate Base Rate Alternate Base Rate [Member] Alternate Base Rate. Cover Cover [Abstract] Maximum amount per employee, by the terms of the plan, that the employee may contribute to a defined contribution plan. Defined Contribution Plan Annual Contribution By Per Employee Amount Per employee contribution limit Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Expected stock volatility, minimum (as a percent) Arbitration award amount paid. Arbitration Award Amount Paid Arbitration award amount paid Aristada and Aristada Initio. Aristada And Aristada Initio [Member] ARISTADA and ARISTADA INITIO Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued expenses Represents the period after loss carryforwards have been utilized that tax returns remain open to examination. Period After Loss Carryforwards Utilized That Tax Returns Remain Open To Examination Period after loss carryforwards utilized that tax returns remain open to examination Internal research and development expenses Internal research and development expenses. Total internal R&D expenses Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeited (in shares) Investments [Domain] Summary of Valuation Allowance [Table Text Block] Schedule of Activity in Valuation Allowance Associated with Deferred Taxes Conversion reissuance (in dollars per share) Share Based Compensation Arrangements By Share Based Payment Award Options Conversion Reissuance In Period Weighted Average Exercise Price Share based compensation arrangements by share based payment award options conversion reissuance in period weighted average exercise price Payments Credits Relating To Sales In Prior Years Payments credits relating to sales in prior years. Payments/credits relating to sales in prior years Scenario [Domain] Scenario Represents the manufacturing process period. Manufacturing Process Period Manufacturing Process period Sale of Stock [Domain] Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Amortized Cost Amortized Cost Segment Reporting Segment Reporting Disclosure [Text Block] General and Administrative Expense General and Administrative Expense, Total General and administrative expense Selling, General and Administrative Expense [Abstract] Selling, general and administrative expenses: Operating lease right of use asset remeasurement amount. Operating Lease Right Of Use Asset Remeasurement Amount Operating lease right-of-use asset remeasurement amount Medicaid rebate. Medicaid Rebate [Member] Medicaid Rebate Purchase Commitment, Remaining Minimum Amount Committed Open purchase order commitments Increase decrease in right of use asset. Increase Decrease In Right Of Use Asset Right-of-use assets Deferred Tax Assets, Other Other Intangible assets Finite-Lived Intangible Assets, Net, Ending Balance Finite-Lived Intangible Assets, Net, Beginning Balance Finite-Lived Intangible Assets, Net INTANGIBLE ASSETS, NET Net Carrying Amount Operating Lease, Expense Operating lease expense Gain (Loss) on Extinguishment of Debt Gain (Loss) on Extinguishment of Debt, Total Loss on debt extinguishment Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Weighted average exercise price (in dollars per share) This element represents receipt of Alkermes' stock for the exercise of stock options or to satisfy minimum tax withholding obligations related to stock based awards. Receipt Of Company Stock For Exercise Of Stock Options Or To Satisfy Minimum Tax Withholding Obligations Related To Stock Based Awards Shares Receipt of Alkermes' shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (in shares) Nature of Operation, Product Information, Concentration of Risk [Table] Schedule Of Product Information [Table] Deferred Tax Assets Operating Lease Liabilities Deferred tax assets, operating lease liabilities. Lease liability Property, Plant and Equipment, Useful Life Estimated useful life New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Summary of Future Lease Payments Under Non-Cancelable Leases Lease agreement lease renewal term. Lease Agreement Lease Renewal Term Lease agreement option to extend renewal term Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Denominator: Contract with Customer, Liability, Current Contract liabilities—short-term Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity [Abstract] Held-to-maturity, Amortized Cost Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Other (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Vesting period Represents the funding commitment expressed as a percentage of partnership's total funding. Funding Commitment As Percentage Of Partnerships Funding Funding commitment as percentage of partnership's total funding Assets Held For Sale [Member] Assets held for sale member. Assets Held For Sale Increase (Decrease) in Contract with Customer, Asset Contract assets Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk-free interest rate, minimum (as a percent) Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Reconciliation of effective income tax rate Depreciation, Total Depreciation Depreciation expense Effective Income Tax Rate Reconciliation, Nonoperating income Effective income tax rate reconciliation, nonoperating income. Nonoperating income Long-Lived Assets Held-for-Sale, Name [Domain] Represents the time-vested restricted stock units awarded by the company to its employees as a form of incentive compensation. Time Based Restricted Stock Unit Awards [Member] Time-based RSU Awards Time-Based RSUs Unrecognized share-based compensation expense Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Payments/credits relating to sales in current year Payments Credits Relating To Sales In Current Year Payments credits relating to sales in current year. Lessee, Operating Lease, Term of Contract Lease period Long-Term Investments, Total Long-Term Investments INVESTMENTS—LONG-TERM Investments-long-term Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding Ordinary shares, shares outstanding Operating Lease, Liability, Current Operating lease liabilities—short-term Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Depreciation, Depletion and Amortization, Total Depreciation, Depletion and Amortization Depreciation and amortization Cybersecurity Risk Management Processes Integrated [Flag] Document Transition Report Document Transition Report Deferred Tax Assets, Net Net deferred tax assets PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment, net Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent Research and Development Expense Research and development R&D expenses Debt Securities, Held-to-Maturity, Fair Value Estimated Fair Value Total Lessee, Operating Leases [Text Block] Leases Payment for the repurchase of ordinary shares Payments for Repurchase of Common Stock Debt Securities, Available-for-Sale, Amortized Cost, Current Short-term investments, Amortized Cost Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Provision (Benefit) for Income Taxes from Continuing Operations Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block] Employee Benefit Plans Statement of Cash Flows [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted Average Grant Date Fair Value Current Federal Tax Expense (Benefit) U.S. federal Share-Based Payment Arrangement, Option, Activity [Table Text Block] Schedule of Stock Option Activity Operating Activities [Domain] Award Granted in February 2021 Award Granted in February Two zero Two One [Member] Award granted in February two zero two one. Share based compensation cost capitalized Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amounts Employee service share based compensation allocation of recognized period costs capitalized amounts. Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent Share-based compensation (as a percent) Equity [Text Block] Shareholders' Equity Operating lease liabilities Operating lease liabilities, discontinued operating activities Operating lease liabilities, discontinued operating activities Goodwill Finite-Lived Intangible Assets [Line Items] Earnings Per Share [Text Block] Earnings Per Share SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease), Total SEC Schedule, 12-09, Valuation Allowances and Reserves, Period Increase (Decrease) (Additions) / Reductions Debt Security, Government, Non-US [Member] Non-U.S. government debt securities Discontinued Operations and Disposal Groups [Abstract] Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Summary of RSU Activity Investments determined using Level 3 inputs Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Balance, January 1, 2025 Balance, December 31, 2025 Deferred Tax Liabilities, Other Other Cybersecurity Risk Management Processes Integrated [Text Block] Contract with Customer, Asset, after Allowance for Credit Loss [Abstract] Contract Asset [Abstract] NET INCOME Net income Increase (Decrease) in Inventories, Total Increase (Decrease) in Inventories Inventory Estimated Fair Value Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value Increase decrease in operating lease liabilities. Increase Decrease In Operating Lease Liabilities Operating lease liabilities Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected annual dividend yield Award Granted in February 2023 and 2024 Award Granted in February Two zero Two Three And Two Zero Two Four [Member] Award granted in february 2023 and 2024. Operating Lease, Payments Payments for operating leases Proceeds from the sale of the Athlone Facility Proceeds from Divestiture of Businesses Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Aggregate intrinsic value of stock options exercisable Assets [Abstract] ASSETS Income Tax Authority, Name [Axis] Income Tax Authority, Name LYBALVI. L Y B A L V I [Member] LYBALVI Construction in Progress [Member] Construction in Progress Document Fiscal Year Focus Document Fiscal Year Focus Other Assets [Member] Other Assets Concentration Risk Benchmark [Domain] Concentration Risk Benchmark Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES: Accounts Payable, Current, Total Accounts Payable, Current Accounts payable Interest Expense, Nonoperating Interest Expense, Nonoperating, Total Interest expense Medicare Part D. Medicare Part D [Member] Medicare Part D Reductions based on the lapse of applicable statutes of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Represents the know-how patent royalty as a percentage of net sales under the collaborative agreements. Collaborative Arrangement Know How Royalty Rate Know-how royalty rate (as a percent) Research and Development Expense Research and Development Expense [Member] Research and development Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Investments Actual Credits Received Related To Duplicate Billings Actual credits received related to duplicate billings. Actual credits received related to duplicate billings Percentage Of Reduction In Work force Percentage Of Reduction In Work force Percentage of reduction in work force Represents the amount of incremental capacity available so long as the entity meets certain conditions. Debt Instrument Incremental Capacity Subject To Satisfaction Of Certain Conditions Incremental capacity Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Schedule of Contract Assets and Contract Liabilities Deferred Federal Income Tax Expense (Benefit) U.S. federal Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Issuance of ordinary shares under employee stock plans 2024 Finite-Lived Intangible Asset, Expected Amortization, Year One Discontinuing Operations - Diluted Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Loss per ordinary share from discontinued operations - diluted Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Lessee, Operating Lease, Liability, to be Paid, Year One 2026 Represents the ratio of awards other than stock options counted against the total number of shares available for issuance. Share Based Compensation Arrangement By Share Based Payment Award Equity Instrument Other Than Options Count Against Number Of Shares Available For Grant Ratio Ratio of awards other than stock options counted against the total number of shares available for issuance Accounts payable and accrued expenses. Accounts Payable And Accrued Expenses [Line Items] Accounts Payable And Accrued Expenses [Line Items] Represents the aggregate worldwide net sales tied to know-how royalty under the collaborative agreements. Collaborative Arrangement Net Sales Tied To Know How Royalty Aggregate worldwide net sales Share-based compensation expense from discontinued operations Share-based compensation expense Share-based compensation expense discontinued operations Share-based compensation expense discontinued operations Other External Research and Development expenses Other external research and Development expenses. Other external R&D expenses Liabilities Total liabilities Total Liabilities Disposal Group, Including Discontinued Operation, Liabilities Credit Agreement [Member] Credit agreement. Credit Agreement Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total Contract with Customer, Asset, after Allowance for Credit Loss, Current Contract assets Contract assets, current Debt Instrument [Axis] Lessee, Operating Lease, Liability, to be Paid, after Year Five Thereafter Share-Based Payment Arrangement [Abstract] Unrecognized share-based compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Luxembourg inland revenue two thousand eighteen. Luxembourg Inland Revenue Two Thousand Eighteen [Member] LTA 2018 Debt Securities, Available-for-Sale [Abstract] Available-for-sale securities: Assets, Fair Value Disclosure Assets, Total Sale of Stock [Axis] Depreciation internal research and development expenses Depreciation internal research and development expenses. Depreciation Lease agreement commencement period. Lease Agreement Commencement Period Lease agreement commencement period Concentration Risk, Percentage Concentration risk percentage Debt Instrument, Fair Value Disclosure, Total Debt Instrument, Fair Value Disclosure Amount to be realized in future Revenues Revenues, Total Intellectual Property [Member] Capitalized IP Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Cash flows provided by (used in) investing activities Number of transition service agreement Number of Transition Service Agreement Number of transition service agreement. Net assets transferred to Mural Disposal Group Including Discontinued Operation Assets and Liabilities Net Disposal group including discontinued operation assets and liabilities net. Title of 12(b) Security Title of 12(b) Security Senior Secured Term Loan A Facility [Member] Senior Secured Term Loan A Facility. Senior Secured Term Loan A Facility Income tax reconciliation nondeductible lobbying expenses. Income Tax Reconciliation Nondeductible Lobbying Expenses Non-deductible lobbying expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Share-based compensation Share Repurchase Program, Remaining Authorized, Amount Share repurchase program remaining authorized amount Income Tax Paid, by Individual Jurisdiction [Table] Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Forfeited (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 Forfeited (in dollars per share) Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five After 1 year through 5 years Additional royalty revenue potentially to be repaid to Acorda. Potential Additional Award To Be Paid Potential additional award to be paid Income Tax Disclosure [Text Block] Income Taxes Transaction costs related to the Separation Transaction costs related to the Separation Collaborative Arrangement and Arrangement Other than Collaborative [Table] Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain Gross Unrealized Gains Other Liabilities, Noncurrent OTHER LONG-TERM LIABILITIES Former Term Loans [Member] Former Term Loans. Former Term Loans, due March 12, 2026 Former Term Loans Legal Entity [Axis] Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five After 1 year through 5 years Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Property, Plant and Equipment [Table Text Block] Schedule of Property, Plant and Equipment Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding at the end of the period (in dollars per share) Outstanding at the beginning of the period (in dollars per share) Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five After 1 year through 5 years Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised, Total Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised Proceeds from the issuance of ordinary shares under share-based compensation arrangements Income Tax Disclosure [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Represents the range of net sales under the collaborative arrangement to determine the know-how royalty percentage. Net Sales Between250 And500 Million [Member] Net sales between $250.0 million and 500.0 million Unrecognized Tax Benefits Balance at the end of the period Balance at the beginning of the period Additional Paid-in Capital [Member] Additional Paid-In Capital Separation Agreement Separation Agreement [Member] Separation agreement . Non-Rule 10b5-1 Arr Modified [Flag] Non-Rule 10b5-1 Arrangement Modified [Flag]. Non-Rule 10b5-1 Arrangement Modified Other products and services. Other Products And Services [Member] Other Measurement Frequency [Domain] Measurement Frequency Stock Repurchase Program Authorized Dollar Amount Share repurchase aggregate amount Statement of Income Location, Balance [Axis] Income Statement Location Trading Symbol Trading Symbol Intangible Asset, Finite-Lived [Table] Schedule Of Finite Lived Intangible Assets [Table] Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Risk-free interest rate, maximum (as a percent) Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Within 1 year Subsequent Event Type [Axis] Subsequent Event Type Prepaid expenses and other current assets Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current Marketable Securities Realized Loss Realized losses Represents the loss realized on the sale of debt or equity securities categorized as held-to-maturity, trading securities and available-for-sale. Employee-related Liabilities, Current, Total Employee-related Liabilities, Current Accrued compensation State Medicaid Rebates State Medicaid Rebates [Member] State Medicaid rebates. Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Expected option term Fair Value, Recurring [Member] Recurring Basis Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accounts Payable and Accrued Expenses Schedule of Equity Method Investments [Line Items] Award Granted in February 2022 and 2023 Award Granted in February Two zero Two Two And Two Zero Two Three [Member] Award granted in February two zero two two And two zero two three. Lessee, Operating Lease, Liability, to be Paid Total operating lease payments Business Combination, Contingent Consideration, Change in Contingent Consideration, Asset, Increase (Decrease) Change in the fair value of contingent consideration Increase (decrease) in fair value of contingent consideration Change in the fair value of contingent consideration Lessee, Operating Lease, Liability, Undiscounted Excess Amount Less: imputed interest Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Research and Development (as a percent) Research and Development (as a percent) The minimum percentage of revenues or receivables from a single customer that is used as a threshold for disclosure of a concentration of risk. Threshold For Disclosure Percentage Threshold percentage for disclosure of revenue and receivables Selling and Marketing Expense Selling and Marketing Expense, Total Selling and marketing expense Amounts recognized into other (expense) income, net Contract with customer liability other (expense) income net recognized. Contract With Customer Liability Other (Expense) Income Net Recognized Employee-related Employee-Related Internal Research and Development Expenses Employee-related internal research and development expenses. Equity Components [Axis] Equity Components MISSISSIPPI Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Weighted average remaining contractual term of stock options exercisable Current Federal, State and Local, Tax Expense (Benefit) Current Federal, State and Local, Tax Expense (Benefit), Total Domestic - Ireland Nonoperating Income (Expense) OTHER INCOME (EXPENSE), NET Total other income, net Equity Component [Domain] Equity Component Asset Class [Axis] Asset Class Represents the number of equity-based compensation plans under which awards are currently made. Share Based Compensation Arrangement By Share Based Payment Award Number Of Plans Under Which Awards Are Currently Made Number of share-based compensation plan under which awards are currently made Goodwill and Intangible Assets Disclosure [Abstract] 852 Winter Street Lease Winter Street Lease Two [Member] 852 winter street lease two. Document Annual Report Document Annual Report Business Combination [Axis] Business Acquisition Fair value of guarantee Guarantees, Fair Value Disclosure Customer [Axis] Customer Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Expiration period Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing Building and Building Improvements [Member] Buildings and improvements Building and Improvements Effective Income Tax Rate Reconciliation, Tax Contingency, Amount, Total Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Worldwide changes in unrecognized tax benefits Senior Secured Term Loan B Facility [Member] Senior Secured Term Loan B Facility Senior secured term loan B facility. Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent Meals and Entertainment (as a percent) Maximum [Member] Maximum Statistical Measurement [Axis] Statistical Measurement Janssen Pharmaceutica N.V. Janssen Pharmaceutica N V [Member] Janssen Pharmaceutica N.V. Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised (in dollars per share) Finite-Lived Intangible Assets, Accumulated Amortization Accumulated Amortization Receivables, Net, Current, Total Receivables, Net, Current Receivables, net Common Stock, Value, Issued Ordinary shares, par value, $0.01 per share; 450,000,000 shares authorized; 181,011,166 and 176,670,785 shares issued; and 165,607,028 and 162,176,994 shares outstanding at December 31, 2025 and 2024, respectively Summary Of Cash Paid For Income Taxes, Net Of Refunds Received [Table Text Block] Summary of cash paid for income taxes, net of refunds received. Summary of Cash Paid for Income Taxes, Net of Refunds Received The limit of annual employee contributions to the plan, as a percentage of their total taxable earnings. Defined Contribution Plan Maximum Employee Contribution Limit As Percentage Of Taxable Earnings Maximum employee contribution limit as a percentage of their total taxable earnings Property, Plant and Equipment [Member] Property, Plant and Equipment, Net Guaranty date Guaranty Date Guaranty Date Line of Credit Facility, Expiration Date Line of credit facility maturity date Consolidation, Policy [Policy Text Block] Principles of Consolidation Secured Overnight Financing Rate (SOFR) [Member] SOFR Royalty [Member] Royalty Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] COMPREHENSIVE INCOME: Continuing Operations - Diluted Income (Loss) from Continuing Operations, Per Diluted Share Earnings per ordinary share from continuing operations - diluted Deferred Tax Assets, Operating Loss Carryforwards, Total Deferred Tax Assets, Operating Loss Carryforwards Net Operating Loss ("NOL") carryforwards Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block] Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent State and local income tax, net of federal income tax effect (as a percent) Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] Treasury Stock, Value, Acquired, Cost Method Excluding commission Treasury Stock, Value, Acquired, Cost Method Excluding commission. Shares repurchased value Entity Public Float Entity Public Float Preferred Stock, Shares Authorized Preferred stock shares, authorized Costs and Expenses Total expenses Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class Schedule of Debt [Table Text Block] Schedule of Long-term Debt Payment, Tax Withholding, Share-Based Payment Arrangement Employee taxes paid related to net share settlement of equity awards Lender Name [Axis] Schedule of accrued sales discounts allowances and reserves. Schedule Of Accrued Sales Discounts Allowances And Reserves Table [Text Block] Summary of Current Provision for Sales, Discounts, Allowances and Reserves Total accrued sales discounts, allowances and reserves Carrying value as of the balance sheet date of obligations relating to sales discounts, allowances and reserves. Accrued Sales Discounts Allowances And Reserves Accrued sales discounts, allowances and reserves Stock Option Awards Employee Stock [Member] Revenue from Contract with Customer [Text Block] Revenue from Contracts with Customers Registrant Name Entity Registrant Name Entity Registrant Name Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total Accrued interest and penalties related to uncertain tax positions Entity Voluntary Filers Entity Voluntary Filers Customer Concentration Risk [Member] Customer Concentration Risk Percentage of net sales in royalty payment. Percentage Of Net Sales In Royalty Payment Percentage of net sales in royalty payment Treasury Stock, Shares, Acquired Shares repurchased Repurchase of Alkermes' ordinary shares (in shares) Commitments and contingencies. Commitments And Contingencies [Table] Commitments And Contingencies [Table] Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense) Other income (expense), net Other segment (expenses) income Deferred State and Local Income Tax Expense (Benefit) U.S. state Accounts Payable and Accrued Liabilities, Current Accounts payable and accrued expenses Total accounts payable and accrued expenses Additions of property, plant and equipment Additions of property, plant and equipment, discontinued operations Additions of property, plant and equipment, discontinued operations Cybersecurity Risk Management Positions or Committees Responsible [Flag] Operating lease liability remeasurement amount. Operating Lease Liability Remeasurement Amount Operating lease liability remeasurement amount Rule10 B51 Trading Plan [Member] Rule10b5-1 Trading plan. Assets Held for Sale Discontinued Operations, Held-for-Sale [Member] Income Tax Expense (Benefit) INCOME TAX PROVISION (BENEFIT) INCOME TAX PROVISION (BENEFIT) Total income tax provision (benefit) Measurement Frequency [Axis] Measurement Frequency Stock Repurchased During Period, Value Repurchase of Alkermes' ordinary shares Assets held for sale Asset, Held-for-Sale, Not Part of Disposal Group, Current Asset, Held-for-Sale, Not Part of Disposal Group, Current, Total OPERATING ACTIVITIES: Operating Activities [Abstract] Operating Activities. Costs and Expenses [Abstract] EXPENSES: Tabular disclosure of the proceeds from sales and maturities of marketable securities, plus the resulting realized gains and losses. Proceeds And Realized Gain Loss On Marketable Securities Table [Text Block] Schedule of Proceeds from Sales and Maturities of Marketable Securities Plus Resulting Realized Gains and Losses Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Discontinuing Operations - Basic Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share Loss per ordinary share from discontinued operations - basic Relating to research and development. Research And Development [Member] Research and development revenue Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentrations Disposal Group Classification [Axis] 900 Winter Street Lease. Winter Street Lease [Member] 900 Winter Street Lease Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Payments to Acquire Property, Plant, and Equipment, Total Payments to Acquire Property, Plant, and Equipment Additions of property, plant and equipment Commitments and contingencies. Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Granted (in shares) Assets TOTAL ASSETS Finite-Lived Intangible Assets, Net [Abstract] Finite-lived intangible assets: Inventory, Policy [Policy Text Block] Inventory Property, Plant and Equipment [Table] Schedule Of Property Plant And Equipment [Table] Income Statement [Abstract] Retirement Plan Name [Domain] Product Returns Product Returns [Member] Product returns. Rule 10B5-1 Plan Three [Member] Rule 10B5-1 Plan Three [Member] Stock distribution ratio by means of separation of business Stock distribution ratio by means of separation of business. Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Reductions based on tax positions related to prior periods Share-Based Payment Arrangement [Policy Text Block] Share-Based Compensation Deferred Income Tax Expense (Benefit) Deferred income taxes Total deferred income tax provision (benefit) Selling, General and Administrative Expense Selling, General and Administrative Expenses [Member] Selling, general and administrative Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Vested (in shares) Earnings Per Share, Diluted Diluted Earnings per ordinary share - diluted Schedule of Segment Reporting Information, by Segment [Table Text Block] Summary of Significant Segment Expenses Title and Position [Domain] Title of Individual Purchase Commitment, Excluding Long-Term Commitment [Domain] Purchase Commitment, Excluding Long-Term Commitment Represents the notice period required to be served before the termination of the agreement. Collaborative Arrangement Effective Notice Period Required To Be Served For Termination Of Agreement Notice period required to be given before termination of agreement Disaggregation of Revenue [Abstract] REVENUES: Corporate Minimum Tax Rate Corporate minimum tax rate. Corporate minimum tax rate Estimated useful life Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] Total assets Assets Disposal Group, Including Discontinued Operation, Assets City Area Code City Area Code Auditor Name Auditor Name Licensing Agreements [Member] Collaboration agreements Discontinued Operation, Tax Effect of Discontinued Operation Income tax benefit from discontinued operations Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule of Goodwill and Intangible Assets Line of Credit Facility, Maximum Borrowing Capacity Aggregate principal amount Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false] Change in accounting principle, accounting standards update, early adoption [true false] Increase in operating lease right of use asset. Increase In Operating Lease Right Of Use Asset Increase in operating lease right of use asset Represents the number of license agreements. Number Of License Agreements Number of license agreements Deferred Tax Assets, Tax Credit Carryforwards, Total Deferred Tax Assets, Tax Credit Carryforwards Tax credits Counterparty Name [Domain] Counterparty Name Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Research and Development Operating Lease, Weighted Average Remaining Lease Term Weighted average remaining lease term Segment Reporting Information [Line Items] Disposal Group Name [Axis] Retirement Plan Name [Axis] Award Date [Axis] Cash and Cash Equivalents, Policy [Policy Text Block] Cash, Cash Equivalents and Restricted Cash Operating lease liabilities-short-term Disposal Group Including Discontinued Operation Operating Lease Liabilities Current Disposal group including discontinued operation operating lease liabilities current. Property, Plant and Equipment, Net PROPERTY, PLANT AND EQUIPMENT, NET Total property, plant and equipment, net Property, plant and equipment, net GOODWILL Goodwill Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Goodwill Deferred Foreign Income Tax Expense (Benefit) Foreign - U.S. Commitment on equity method investment Commitment On Equity Method Investment The amount represents the commitment on the equity method investment. Operating Income (Loss) OPERATING INCOME FROM CONTINUING OPERATIONS Award Date [Domain] Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Schedule of Revenues by Geographic Location, as Determined by the Location of the Customer, and the Location of its Long-term Assets Retained Earnings [Member] Accumulated Deficit Entity Address, Country Entity Address, Country Cash and Cash Equivalents [Axis] Cash and Cash Equivalents Tax benefit related to intercompany transfer of inventory Income Tax Expense Benefit Related to Intercompany Transfer of Inventory Income tax expense benefit related to intercompany transfer of inventory. Share-Based Payment Arrangement, Noncash Expense, Total Share-Based Payment Arrangement, Noncash Expense Share-based compensation expense L Y B A L V I External Research And Development Expenses Development Programs LYBALVI external research and development expenses development programs. LYBALVI Alixorexton Alixorexton External Research And Development Expenses Development Programs Alixorexton external research and development expenses development programs. Operating Lease, Weighted Average Discount Rate, Percent Weighted average incremental borrowing rate Operating Lease, Liability, Noncurrent OPERATING LEASE LIABILITIES—LONG-TERM Fair Value, Inputs, Level 1 [Member] Level 1 Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Cash flows provided by (used in) financing activities Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Change in accounting principle, accounting standards update, adopted [true false] Auditor Location Auditor Location Tabular disclosure of the estimated useful life of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Property Plant And Equipment Estimated Useful Lives Table [Text Block] Schedule of Estimated Useful Life of Property, Plant and Equipment A L K S Two Six Eight Zero External Research and Development Expenses Development Programs ALKS 2680 external research and development expense development programs. ALKS 2680 Foreign derived intangible income Effective Income Tax Rate Reconciliation, FDII, Amount Nonoperating Income (Expense) [Abstract] OTHER INCOME, NET: Goodwill [Table] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value Rule 10b5-1 Plan One [Member] Rule 10b5-1 Plan One. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Anti-Dilutive Potential Common Share Equivalent Excluded from Calculation of Earnings (Loss) Per Share Corporate Debt Securities [Member] Corporate debt securities Income Tax Jurisdiction [Domain] Income Tax Authority Entity Interactive Data Current Entity Interactive Data Current Deferred Tax Liabilities, Gross [Abstract] Deferred tax liabilities: Contract With Customer Liability Additions Additions Amount of increase in contract with customer liability during the period. Increase (Decrease) in Contract with Customer, Liability Contract liabilities Statement of Income Location, Balance [Domain] Income Statement Location Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Represents designated tax departments of governments entitled to levy and collect income taxes from the entity outside the entity's country of domicile, excluding the specified country. Foreign Country Excluding Specified Country [Member] Rest of world Contract with Customer, Asset, after Allowance for Credit Loss, Total Contract with Customer, Asset, after Allowance for Credit Loss Contract assets Contract assets Deferred Federal, State and Local, Tax Expense (Benefit) Deferred Federal, State and Local, Tax Expense (Benefit), Total Domestic - Ireland Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Schedule of Revenue and Receivables From Customers Exceeding 10% of Total in Each Category Entity Tax Identification Number Entity Tax Identification Number Land [Member] Land Long-Term Debt, Type Long-Term Debt, Type [Axis] Stock distribution by separation of business Stock distribution by separation of business. Income Tax Authority, Name [Domain] Income Tax Authority, Name Construction in Progress, Gross Construction in progress Local Phone Number Local Phone Number Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] WEIGHTED AVERAGE NUMBER OF ORDINARY SHARES OUTSTANDING: Auditor Opinion Auditor Opinion [Text Block] Represents the number of equity-based compensation plans under which no further awards will be made. Share Based Compensation Arrangement By Share Based Payment Award Number Of Plans Under Which No Further Awards Will Be Made Number of share-based compensation plan under which no further awards will be made Accounting Policies [Abstract] Other Current Liabilities [Member] Components of Accrued Sales Discounts, Allowances and Reserves Cencora Cencora Incorporation [Member] Cencora Incorporation. Disaggregation of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Royalty revenue Revenue from Contract with Customer, Excluding Assessed Tax Total revenues Revenue by region: Contract with Customer, Asset, Allowance for Credit Loss Ending Balance Beginning balance Allowance for doubtful accounts Foreign - U.S. Federal [Member] Foreign - U.S. Federal. Federal Lessee, Operating Lease, Liability, to be Paid, Year Four 2029 Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Shares of common stock available for issuance Weighted average period for unrecognized share-based compensation expense expected to be recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Deferred Tax Liabilities, Deferred Expense Deferred Tax Liabilities, Deferred Expense, Total Capitalised expenses Capitalised expenses Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Maximum percentage of employer contribution matched of employee's Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Schedule of Accounts Payable and Accrued Expenses Represents furniture, fixtures and equipment of the entity. Furniture Fixture And Equipment [Member] Furniture, Fixtures and Equipment Furniture, fixtures and equipment Blair Jackson [Member]. Blair Jackson [Member] Entity Emerging Growth Company Entity Emerging Growth Company Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Weighted average contractual remaining life Disposal Group, Including Discontinued Operation, Operating Income (Loss), Total Operating loss from discontinued operations Disposal Group, Including Discontinued Operation, Operating Income (Loss)