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Business Segments (Assets by Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	$ 527,425	$ 527,733	$ 527,553
Indefinite-lived intangible assets		2,167,162
Finite-lived intangible assets	158,364	153,421
Intangible assets, net	2,295,350	2,320,583
Intangible assets, net (including goodwill)	2,822,775	2,848,316
North American OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	498,936	498,936	498,936
Indefinite-lived intangible assets		2,092,853
Finite-lived intangible assets		135,932
Intangible assets, net	2,209,986	2,228,785
Intangible assets, net (including goodwill)	2,708,922	2,727,721
International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	28,489	28,797	28,617
Indefinite-lived intangible assets		74,309
Finite-lived intangible assets		17,489
Intangible assets, net	85,364	91,798
Intangible assets, net (including goodwill)	113,853	120,595
Finite-Lived Tradenames and Customer Relationships
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangible assets	158,364
Finite-Lived Tradenames and Customer Relationships \| North American OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangible assets	141,234
Finite-Lived Tradenames and Customer Relationships \| International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangible assets	17,130
Indefinite- Lived Tradenames
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangible assets	2,136,986	$ 2,167,162	$ 2,168,902
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	$ 68,234