Business Segments (Revenue by Product) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Revenue from External Customer [Line Items]
Total segment revenues	$ 1,086,812	$ 943,365	$ 963,010
Analgesics
Revenue from External Customer [Line Items]
Total segment revenues	119,323	119,142	114,007
Cough & Cold
Revenue from External Customer [Line Items]
Total segment revenues	107,080	70,641	111,106
Women's Health
Revenue from External Customer [Line Items]
Total segment revenues	264,509	268,097	251,551
Gastrointestinal
Revenue from External Customer [Line Items]
Total segment revenues	204,559	161,136	172,908
Eye & Ear Care
Revenue from External Customer [Line Items]
Total segment revenues	163,449	110,409	112,156
Dermatologicals
Revenue from External Customer [Line Items]
Total segment revenues	120,386	107,083	103,012
Oral Care
Revenue from External Customer [Line Items]
Total segment revenues	97,521	101,431	93,205
Other OTC
Revenue from External Customer [Line Items]
Total segment revenues	9,985	5,426	5,065
North American OTC Healthcare
Revenue from External Customer [Line Items]
Total segment revenues	967,881	849,319	859,368
North American OTC Healthcare | Analgesics
Revenue from External Customer [Line Items]
Total segment revenues	117,868	117,775	113,130
North American OTC Healthcare | Cough & Cold
Revenue from External Customer [Line Items]
Total segment revenues	86,855	56,158	87,601
North American OTC Healthcare | Women's Health
Revenue from External Customer [Line Items]
Total segment revenues	249,136	252,535	239,330
North American OTC Healthcare | Gastrointestinal
Revenue from External Customer [Line Items]
Total segment revenues	152,191	124,755	130,088
North American OTC Healthcare | Eye & Ear Care
Revenue from External Customer [Line Items]
Total segment revenues	149,454	99,774	100,245
North American OTC Healthcare | Dermatologicals
Revenue from External Customer [Line Items]
Total segment revenues	117,173	103,998	100,591
North American OTC Healthcare | Oral Care
Revenue from External Customer [Line Items]
Total segment revenues	85,239	88,903	83,323
North American OTC Healthcare | Other OTC
Revenue from External Customer [Line Items]
Total segment revenues	9,965	5,421	5,060
International OTC Healthcare
Revenue from External Customer [Line Items]
Total segment revenues	118,931	94,046	103,642
International OTC Healthcare | Analgesics
Revenue from External Customer [Line Items]
Total segment revenues	1,455	1,367	877
International OTC Healthcare | Cough & Cold
Revenue from External Customer [Line Items]
Total segment revenues	20,225	14,483	23,505
International OTC Healthcare | Women's Health
Revenue from External Customer [Line Items]
Total segment revenues	15,373	15,562	12,221
International OTC Healthcare | Gastrointestinal
Revenue from External Customer [Line Items]
Total segment revenues	52,368	36,381	42,820
International OTC Healthcare | Eye & Ear Care
Revenue from External Customer [Line Items]
Total segment revenues	13,995	10,635	11,911
International OTC Healthcare | Dermatologicals
Revenue from External Customer [Line Items]
Total segment revenues	3,213	3,085	2,421
International OTC Healthcare | Oral Care
Revenue from External Customer [Line Items]
Total segment revenues	12,282	12,528	9,882
International OTC Healthcare | Other OTC
Revenue from External Customer [Line Items]
Total segment revenues	$ 20	$ 5	$ 5