Business Segments (Information on Operating and Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information, Profit (Loss):
Net sales	$ 199,485	$ 196,435	$ 596,034	$ 520,981
Other revenues	710	1,171	2,358	3,596
Revenues	200,195	197,606	598,392	524,577
Cost of sales	83,411	85,861	249,432	228,424
Gross profit	116,784	111,745	348,960	296,153
Advertising and promotion	29,935	30,144	84,250	74,284
Contribution margin	86,849	81,601	264,710	221,869
Other operating expenses	24,206	24,608	69,664	75,555
Operating income	62,643	56,993	195,046	146,314
Other expense	19,462	23,459	62,464	56,305
Income before income taxes	43,181	33,534	132,582	90,009
Provision for income taxes	15,186	12,241	46,611	35,521
Net income	27,995	21,293	85,971	54,488
North American OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	165,050	160,654	486,796	409,767
International OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	13,812	15,563	43,254	45,157
Household Cleaning
Segment Reporting Information, Profit (Loss):
Net sales	20,623	20,218	65,984	66,057
Operating Segments
Segment Reporting Information, Profit (Loss):
Net sales	199,713	197,944	598,462	523,917
Operating Segments | North American OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	165,278	162,163	489,224	412,703
Other revenues	0	151	14	478
Revenues	165,050	160,805	486,810	410,245
Cost of sales	62,654	63,479	182,279	158,005
Gross profit	102,396	97,326	304,531	252,240
Advertising and promotion	26,472	26,779	74,107	64,573
Contribution margin	75,924	70,547	230,424	187,667
Operating Segments | International OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	13,812	15,563	43,254	45,157
Other revenues	9	4	41	62
Revenues	13,821	15,567	43,295	45,219
Cost of sales	4,965	6,247	16,347	17,926
Gross profit	8,856	9,320	26,948	27,293
Advertising and promotion	2,838	2,776	8,338	8,151
Contribution margin	6,018	6,544	18,610	19,142
Operating Segments | Household Cleaning
Segment Reporting Information, Profit (Loss):
Net sales	20,623	20,218	65,984	66,057
Other revenues	701	1,016	2,303	3,056
Revenues	21,324	21,234	68,287	69,113
Cost of sales	15,792	16,135	50,806	52,493
Gross profit	5,532	5,099	17,481	16,620
Advertising and promotion	625	589	1,805	1,560
Contribution margin	4,907	4,510	15,676	15,060
Intersegment Eliminations
Segment Reporting Information, Profit (Loss):
Net sales	(228)	(1,509)	(2,428)	(2,936)
Intersegment Eliminations | North American OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	(228)	(1,509)	(2,428)	(2,936)
Intersegment Eliminations | International OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	0	0	0	0
Intersegment Eliminations | Household Cleaning
Segment Reporting Information, Profit (Loss):
Net sales	$ 0	$ 0	$ 0	$ 0