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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 07, 2025
Jun. 30, 2024
Cover [Abstract]      
Entity Registrant Name Alkermes plc.    
Entity Central Index Key 0001520262    
Document Type 10-K    
Document Period End Date Dec. 31, 2024    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 3,943,314,276
Entity Common Stock, Shares Outstanding   162,614,067  
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol ALKS    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity File Number 001-35299    
Entity Incorporation, State or Country Code L2    
Entity Tax Identification Number 98-1007018    
Entity Address, Address Line One Connaught House    
Entity Address, Address Line Two 1 Burlington Road    
Entity Address, City or Town Dublin 4    
Entity Address, Country IE    
Entity Address, Postal Zip Code D04 C5Y6    
City Area Code 353    
Local Phone Number 1-772-8000    
Document Annual Report true    
Document Transition Report false    
Title of 12(b) Security Ordinary shares, $0.01 par value    
Security Exchange Name NASDAQ    
Auditor Firm ID 238    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Boston, Massachusetts    
Auditor Opinion

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Alkermes plc and its subsidiaries (the “Company”) as of December 31, 2024 and 2023, and the related consolidated statements of operations and comprehensive income (loss), of shareholders’ equity and of cash flows for each of the three years in the period ended December 31, 2024, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

    
Documents Incorporated by Reference

Portions of the definitive proxy statement for our 2025 Annual General Meeting of Shareholders are incorporated by reference into Part III of this report.