Business Segments - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	$ 289,273	$ 276,225	$ 566,332	$ 545,406
Analgesics
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	33,291	30,339	61,541	63,566
Cough & Cold
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	31,226	28,028	59,089	46,920
Women's Health
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	64,124	68,365	130,175	135,557
Gastrointestinal
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	57,309	46,605	111,403	99,175
Eye & Ear Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	42,695	40,806	86,042	80,251
Dermatologicals
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	33,774	33,204	64,235	65,293
Oral Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	24,331	26,171	48,476	50,127
Other OTC
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	2,523	2,707	5,371	4,517
North American OTC Healthcare
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	252,054	251,728	494,572	494,121
North American OTC Healthcare | Analgesics
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	32,750	29,943	60,547	62,764
North American OTC Healthcare | Cough & Cold
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	24,058	23,022	45,650	37,067
North American OTC Healthcare | Women's Health
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	59,379	65,020	120,563	128,268
North American OTC Healthcare | Gastrointestinal
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	41,272	37,964	81,339	80,330
North American OTC Healthcare | Eye & Ear Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	37,961	37,818	76,572	73,805
North American OTC Healthcare | Dermatologicals
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	32,872	32,365	62,327	63,515
North American OTC Healthcare | Oral Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	21,251	22,893	42,226	43,860
North American OTC Healthcare | Other OTC
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	2,511	2,703	5,348	4,512
International OTC Healthcare
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	37,219	24,497	71,760	51,285
International OTC Healthcare | Analgesics
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	541	396	994	802
International OTC Healthcare | Cough & Cold
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	7,168	5,006	13,439	9,853
International OTC Healthcare | Women's Health
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	4,745	3,345	9,612	7,289
International OTC Healthcare | Gastrointestinal
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	16,037	8,641	30,064	18,845
International OTC Healthcare | Eye & Ear Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	4,734	2,988	9,470	6,446
International OTC Healthcare | Dermatologicals
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	902	839	1,908	1,778
International OTC Healthcare | Oral Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	3,080	3,278	6,250	6,267
International OTC Healthcare | Other OTC
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	$ 12	$ 4	$ 23	$ 5