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Income Taxes - Schedule of Reconciliation of Statutory Tax Rate to Effective Tax Rate (Parenthetical) (Details) $ in Millions | Dec. 31, 2023 USD ($)
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Income Tax Disclosure [Abstract] |
Tax benefit related to intercompany transfer of inventory | $ 15.7

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- Definition Income tax expense benefit related to intercompany transfer of inventory. + References No definition available. + Details
Name: | alks_IncomeTaxExpenseBenefitRelatedToIntercompanyTransferOfInventory
Namespace Prefix: | alks_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration