Business Segments (Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	$ 237,422	$ 238,069	$ 466,816	$ 470,223
Analgesics
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	30,890	29,074	59,031	57,839
Cough & Cold
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	17,882	26,320	35,222	49,042
Women's Health
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	65,598	62,583	133,439	124,580
Gastrointestinal
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	38,097	41,242	73,852	79,799
Eye & Ear Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	29,804	25,471	55,201	55,235
Dermatologicals
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	28,711	28,615	57,030	55,043
Oral Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	25,078	23,502	50,423	46,133
Other OTC
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	1,362	1,262	2,618	2,552
North American OTC Healthcare
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	216,575	213,878	427,233	424,662
North American OTC Healthcare | Analgesics
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	30,623	28,831	58,490	57,366
North American OTC Healthcare | Cough & Cold
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	14,796	20,506	28,234	37,846
North American OTC Healthcare | Women's Health
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	61,492	59,678	126,902	119,256
North American OTC Healthcare | Gastrointestinal
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	31,718	32,214	61,768	63,786
North American OTC Healthcare | Eye & Ear Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	26,767	22,286	49,619	49,039
North American OTC Healthcare | Dermatologicals
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	27,875	28,039	55,495	53,777
North American OTC Healthcare | Oral Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	21,944	21,063	44,110	41,042
North American OTC Healthcare | Other OTC
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	1,360	1,261	2,615	2,550
International OTC Healthcare
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	20,847	24,191	39,583	45,561
International OTC Healthcare | Analgesics
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	267	243	541	473
International OTC Healthcare | Cough & Cold
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	3,086	5,814	6,988	11,196
International OTC Healthcare | Women's Health
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	4,106	2,905	6,537	5,324
International OTC Healthcare | Gastrointestinal
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	6,379	9,028	12,084	16,013
International OTC Healthcare | Eye & Ear Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	3,037	3,185	5,582	6,196
International OTC Healthcare | Dermatologicals
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	836	576	1,535	1,266
International OTC Healthcare | Oral Care
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	3,134	2,439	6,313	5,091
International OTC Healthcare | Other OTC
Geographic Areas, Revenues from External Customers [Abstract]
Total revenues	$ 2	$ 1	$ 3	$ 2