Business Segments (Information on Operating and Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information, Profit (Loss):
Net sales	$ 144,541	$ 141,642
Other revenues	1,161	870
Total revenues	145,702	142,512
Cost of sales	63,836	59,488
Gross profit	81,866	83,024
Advertising and promotion	19,096	18,681
Contribution margin	62,770	64,343
Other operating expenses	19,967	14,902
Operating income	42,803	49,441
Other expense	14,653	15,905
Income before income taxes	28,150	33,536
Provision for income taxes	11,418	12,844
Net income	16,732	20,692
Geographic Concentration Risk | Sales | United States
Geographic Areas, Revenues from External Customers [Abstract]
Concentration risk, percentage	84.50%	89.00%
Geographic Concentration Risk | Sales | Canada
Geographic Areas, Revenues from External Customers [Abstract]
Concentration risk, percentage	5.60%	8.20%
Geographic Concentration Risk | Sales | Australia
Geographic Areas, Revenues from External Customers [Abstract]
Concentration risk, percentage	5.20%
Geographic Concentration Risk | Goodwill and Intangible Assets | United States
Geographic Areas, Revenues from External Customers [Abstract]
Concentration risk, percentage	92.00%
Geographic Concentration Risk | Goodwill and Intangible Assets | Australia
Geographic Areas, Revenues from External Customers [Abstract]
Concentration risk, percentage	8.00%
North American OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	110,256	118,936
Other revenues	177	150
Total revenues	110,433	119,086
Cost of sales	42,340	43,546
Gross profit	68,093	75,540
Advertising and promotion	16,353	17,551
Contribution margin	51,740	57,989
International OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	13,692	3,414
Other revenues	35	7
Total revenues	13,727	3,421
Cost of sales	5,078	1,465
Gross profit	8,649	1,956
Advertising and promotion	2,339	263
Contribution margin	6,310	1,693
Household Cleaning
Segment Reporting Information, Profit (Loss):
Net sales	20,593	19,292
Other revenues	949	713
Total revenues	21,542	20,005
Cost of sales	16,418	14,477
Gross profit	5,124	5,528
Advertising and promotion	404	867
Contribution margin	4,720	4,661
Operating Segments
Segment Reporting Information, Profit (Loss):
Net sales	145,258	141,642
Operating Segments | North American OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	110,973	118,936
Operating Segments | International OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	13,692	3,414
Operating Segments | Household Cleaning
Segment Reporting Information, Profit (Loss):
Net sales	20,593	19,292
Intersegment Eliminations
Segment Reporting Information, Profit (Loss):
Net sales	(717)	0
Intersegment Eliminations | North American OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	(717)	0
Intersegment Eliminations | International OTC Healthcare
Segment Reporting Information, Profit (Loss):
Net sales	0	0
Intersegment Eliminations | Household Cleaning
Segment Reporting Information, Profit (Loss):
Net sales	$ 0	$ 0