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Business Segments (Assets by Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	$ 581,109	$ 527,425	$ 527,733
Indefinite-lived intangible assets		2,136,986
Finite-lived intangible assets	155,930	158,364
Intangible assets, net	2,299,605	2,295,350
Intangible assets, net (including goodwill)	2,880,714	2,822,775
North American OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	550,987	498,936	498,936
Indefinite-lived intangible assets		2,068,752
Finite-lived intangible assets		141,234
Intangible assets, net	2,207,655	2,209,986
Intangible assets, net (including goodwill)	2,758,642	2,708,922
International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	30,122	28,489	28,797
Indefinite-lived intangible assets		68,234
Finite-lived intangible assets		17,130
Intangible assets, net	91,950	85,364
Intangible assets, net (including goodwill)	122,072	113,853
Finite-Lived Tradenames and Customer Relationships
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangible assets	155,930
Finite-Lived Tradenames and Customer Relationships \| North American OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangible assets	138,903
Finite-Lived Tradenames and Customer Relationships \| International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangible assets	17,027
Indefinite- Lived Tradenames
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangible assets	2,143,675	$ 2,136,986	$ 2,167,162
Indefinite- Lived Tradenames \| North American OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangible assets	2,068,752
Indefinite- Lived Tradenames \| International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangible assets	$ 74,923