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

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Business Segments (Assets by Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	$ 578,079	$ 575,179	$ 578,583
Indefinite-lived intangible assets		2,265,331
Finite-lived intangible assets	193,741	214,060
Intangible assets, net (excluding goodwill)	2,475,729	2,479,391
Intangible assets, net (including goodwill)	3,053,808	3,054,570
North American OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	546,643	546,643	547,393
Indefinite-lived intangible assets		2,195,617
Finite-lived intangible assets		209,604
Intangible assets, net (excluding goodwill)	2,386,079	2,405,221
Intangible assets, net (including goodwill)	2,932,722	2,951,864
International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	31,436	28,536	31,190
Indefinite-lived intangible assets		69,714
Finite-lived intangible assets		4,456
Intangible assets, net (excluding goodwill)	89,650	74,170
Intangible assets, net (including goodwill)	121,086	102,706
Finite-Lived Tradenames and Customer Relationships
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangible assets	193,741
Finite-Lived Tradenames and Customer Relationships \| North American OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangible assets	190,462
Finite-Lived Tradenames and Customer Relationships \| International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Finite-lived intangible assets	3,279
Indefinite- Lived Tradenames
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangible assets	2,281,988	$ 2,265,331	$ 2,273,191
Indefinite- Lived Tradenames \| North American OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangible assets	2,195,617
Indefinite- Lived Tradenames \| International OTC Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Indefinite-lived intangible assets	$ 86,371