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Inventory - Additional Information (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
Inventory capitalized in advance of validation of LYBALVI’s manufacturing line | $ 14.5 | $ 13.8

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- Definition FIFO inventory advance capitalization amount. + References No definition available. + Details
Name: | alks_FIFOInventoryAdvanceCapitalizationAmount
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_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration