Business Segments (Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	$ 577,128	$ 575,179
Intangible assets
Indefinite-lived	2,273,691	2,265,331
Finite-lived, net	209,360	214,060
Intangible assets, net	2,483,051	2,479,391
Total	3,060,179	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	204,819	209,604
Intangible assets, net	2,400,436	2,405,221
Total	2,947,079	2,951,864
International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	30,485	28,536
Intangible assets
Indefinite-lived	78,074	69,714
Finite-lived, net	4,541	4,456
Intangible assets, net	82,615	74,170
Total	$ 113,100	$ 102,706

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

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