Business Segments - Information on Operating and Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information, Profit (Loss):
Total revenues	$ 277,059	$ 269,181
Cost of sales	116,940	110,169
Gross profit	160,119	159,012
Advertising and marketing	39,951	39,439
Contribution margin	120,168	119,573
Other operating expenses	33,154	28,231
Operating income	87,014	91,342
North American OTC Healthcare
Segment Reporting Information, Profit (Loss):
Total revenues	242,518	242,393
International OTC Healthcare
Segment Reporting Information, Profit (Loss):
Total revenues	34,541	26,788
Operating Segments | North American OTC Healthcare
Segment Reporting Information, Profit (Loss):
Total revenues	242,518	242,393
Cost of sales	102,921	99,404
Gross profit	139,597	142,989
Advertising and marketing	35,412	35,230
Contribution margin	104,185	107,759
Operating Segments | International OTC Healthcare
Segment Reporting Information, Profit (Loss):
Total revenues	34,541	26,788
Cost of sales	14,019	10,765
Gross profit	20,522	16,023
Advertising and marketing	4,539	4,209
Contribution margin	15,983	11,814
Intersegment Eliminations | North American OTC Healthcare
Segment Reporting Information, Profit (Loss):
Total revenues	$ 500	$ 1,000