Business Segments (Revenue by Product) (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Revenue from External Customer [Line Items]
Total segment revenues	$ 1,125,357	$ 1,127,725	$ 1,086,812
Analgesics
Revenue from External Customer [Line Items]
Total segment revenues	117,451	119,262	119,323
Cough & Cold
Revenue from External Customer [Line Items]
Total segment revenues	119,020	126,988	107,080
Women's Health
Revenue from External Customer [Line Items]
Total segment revenues	240,421	251,351	264,509
Gastrointestinal
Revenue from External Customer [Line Items]
Total segment revenues	231,610	226,583	204,559
Eye & Ear Care
Revenue from External Customer [Line Items]
Total segment revenues	179,423	171,076	163,449
Dermatologicals
Revenue from External Customer [Line Items]
Total segment revenues	129,102	123,741	120,386
Oral Care
Revenue from External Customer [Line Items]
Total segment revenues	96,305	97,627	97,521
Other OTC
Revenue from External Customer [Line Items]
Total segment revenues	12,025	11,097	9,985
North American OTC Healthcare
Revenue from External Customer [Line Items]
Total segment revenues	958,260	973,774	967,881
North American OTC Healthcare \| Analgesics
Revenue from External Customer [Line Items]
Total segment revenues	111,996	116,582	117,868
North American OTC Healthcare \| Cough & Cold
Revenue from External Customer [Line Items]
Total segment revenues	93,575	100,218	86,855
North American OTC Healthcare \| Women's Health
Revenue from External Customer [Line Items]
Total segment revenues	217,103	231,754	249,136
North American OTC Healthcare \| Gastrointestinal
Revenue from External Customer [Line Items]
Total segment revenues	160,889	156,957	152,191
North American OTC Healthcare \| Eye & Ear Care
Revenue from External Customer [Line Items]
Total segment revenues	156,553	151,879	149,454
North American OTC Healthcare \| Dermatologicals
Revenue from External Customer [Line Items]
Total segment revenues	123,288	119,822	117,173
North American OTC Healthcare \| Oral Care
Revenue from External Customer [Line Items]
Total segment revenues	83,212	85,542	85,239
North American OTC Healthcare \| Other OTC
Revenue from External Customer [Line Items]
Total segment revenues	11,644	11,020	9,965
International OTC Healthcare
Revenue from External Customer [Line Items]
Total segment revenues	167,097	153,951	118,931
International OTC Healthcare \| Analgesics
Revenue from External Customer [Line Items]
Total segment revenues	5,455	2,680	1,455
International OTC Healthcare \| Cough & Cold
Revenue from External Customer [Line Items]
Total segment revenues	25,445	26,770	20,225
International OTC Healthcare \| Women's Health
Revenue from External Customer [Line Items]
Total segment revenues	23,318	19,597	15,373
International OTC Healthcare \| Gastrointestinal
Revenue from External Customer [Line Items]
Total segment revenues	70,721	69,626	52,368
International OTC Healthcare \| Eye & Ear Care
Revenue from External Customer [Line Items]
Total segment revenues	22,870	19,197	13,995
International OTC Healthcare \| Dermatologicals
Revenue from External Customer [Line Items]
Total segment revenues	5,814	3,919	3,213
International OTC Healthcare \| Oral Care
Revenue from External Customer [Line Items]
Total segment revenues	13,093	12,085	12,282
International OTC Healthcare \| Other OTC
Revenue from External Customer [Line Items]
Total segment revenues	$ 381	$ 77	$ 20