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

X

- 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