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Share-based Compensation - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Inventory
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share based compensation cost capitalized	$ 3.3	$ 3.1
Property, Plant and Equipment, Net
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share based compensation cost capitalized	$ 1.2	$ 0.0

X

- Definition

Employee service share based compensation allocation of recognized period costs capitalized amounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	alks_
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

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- Details

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X

- Details

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