v3.26.3
Revenue from Contracts with Customers - Schedule of Revenue Related Reserves Included in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Disaggregation of Revenue [Line Items]    
Revenue-related reserves $ 396,140 $ 316,035
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Disaggregation of Revenue [Line Items]    
Revenue-related reserves 54,648 47,860
Location, Statement of Financial Position, Balance [Axis]: us-gaap:ReceivablesNetCurrent    
Disaggregation of Revenue [Line Items]    
Revenue-related reserves 18,086 21,049
Location, Statement of Financial Position, Balance [Axis]: alks:AccruedSalesDiscountsAllowancesAndReserves    
Disaggregation of Revenue [Line Items]    
Revenue-related reserves $ 323,406 $ 247,126