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Intangible Assets, net - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jul. 01, 2021
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]            
Amortization expense   $ 5,300,000   $ 4,900,000 $ 10,228,000 $ 9,800,000
Intangible assets, additions         $ 228,970,000  
Impairment of intangible assets     $ 0      
Akorn Operating Company LLC            
Finite-Lived Intangible Assets [Line Items]            
Intangible assets, additions $ 229,000,000          
Minimum            
Finite-Lived Intangible Assets [Line Items]            
Intangible asset, useful life         10 years  
Maximum            
Finite-Lived Intangible Assets [Line Items]            
Intangible asset, useful life         30 years