Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Revenues [Abstract]
Net sales	$ 637,123,000	$ 597,103,000	$ 579,643,000
Cost of products sold	444,191,000	409,840,000	398,036,000
Gross profit	192,932,000	187,263,000	181,607,000
Operating Expenses [Abstract]
Selling expenses	77,319,000	72,858,000	69,819,000
General and administrative expenses	80,410,000	68,811,000	54,874,000
Impairment of intangible asset	1,125,000	0	0
Amortization of intangibles	8,105,000	5,024,000	2,266,000
Income from operations	25,973,000	40,570,000	54,648,000
Other Income & Expenses [Abstract]
Interest and debt expense	10,966,000	7,904,000	12,390,000
Gains (Losses) on Extinguishment of Debt	1,303,000	0	8,567,000
Investment (income) loss, net	(462,000)	(796,000)	(2,725,000)
Foreign currency exchange loss (gain), net	1,232,000	2,215,000	863,000
Other income, net	(93,000)	(377,000)	(462,000)
Income from continuing operations before income tax expense	13,027,000	31,624,000	36,015,000
Current income tax expense (benefit):
Income tax expense	4,043,000	12,045,000	8,825,000
Income from continuing operations			27,190,000
Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax & Other [Abstract]
Net income	$ 8,984,000	$ 19,579,000	$ 27,190,000
Weighted Average Number of Shares Outstanding Basic [Abstract]
Average basic shares outstanding	20,591	20,079	19,939
Weighted Average Number of Shares Outstanding Diluted [Abstract]
Average diluted shares outstanding	20,888	20,315	20,224
Basic income per share:
Basic income per share	$ 0.44	$ 0.98	$ 1.36
Diluted income per share:
Diluted income per share	0.43	0.96	1.34
Common Stock, Dividends, Per Share, Declared	$ 0.16	$ 0.16	$ 0.16