Goodwill (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 28, 2021	Mar. 31, 2022	Mar. 31, 2021	Jul. 01, 2021	Mar. 31, 2020
Goodwill [Line Items]
Goodwill		$ 578,976	$ 578,079		$ 575,179
Goodwill, impairment loss		$ 340	1,247
Measurement Input, Long-term Revenue Growth Rate
Goodwill [Line Items]
Indefinite-lived intangible asset, increase (decrease) in measurement input		10.00%
Measurement Input, Discount Rate
Goodwill [Line Items]
Indefinite-lived intangible asset, increase (decrease) in measurement input		0.50%
Measurement Input, Cap Rate
Goodwill [Line Items]
Indefinite-lived intangible asset, increase (decrease) in measurement input		0.50%
Akorn Operating Company LLC
Goodwill [Line Items]
Goodwill				$ 1,648
International OTC Healthcare
Goodwill [Line Items]
Goodwill		$ 30,685	31,436		$ 28,536
Goodwill, impairment loss	$ 1,200	$ 340	$ 1,247
International Analgesics
Goodwill [Line Items]
Goodwill, impairment loss	$ 300