Business Segments (Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	$ 577,919	$ 575,179
Intangible assets
Indefinite-lived	2,276,683	2,265,331
Finite-lived, net	204,553	214,060
Intangible assets, net	2,481,236	2,479,391
Total	3,059,155	3,054,570
North American OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	546,643	546,643
Intangible assets
Indefinite-lived	2,195,617	2,195,617
Finite-lived, net	200,033	209,604
Intangible assets, net	2,395,650	2,405,221
Total	2,942,293	2,951,864
International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	31,276	28,536
Intangible assets
Indefinite-lived	81,066	69,714
Finite-lived, net	4,520	4,456
Intangible assets, net	85,586	74,170
Total	$ 116,862	$ 102,706

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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