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Inventory - Schedule of Inventories (Parenthetical) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Inventory Disclosure [Abstract] |  |
Finished goods inventory located at third-party warehouse and shipping service provider | $ 25.3 | $ 26.5

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- Definition Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale, located at third party warehouse and shipping service provider. + References No definition available. + Details
Name: | alks_InventoryFinishedGoodsNetOfReservesLocatedAtThirdPartyWarehouseAndShippingServiceProvider
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