Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income from operations	$ 70,099,000	$ 25,973,000	$ 40,570,000
Income from continuing operations before income tax expense	49,685,000	13,027,000	31,624,000
Revenues [Abstract]
Net sales	839,419,000	637,123,000	597,103,000
Cost of products sold	554,845,000	444,191,000	409,840,000
Gross profit	284,574,000	192,932,000	187,263,000
Operating Expenses [Abstract]
Selling expenses	101,956,000	77,319,000	72,858,000
General and administrative expenses	83,350,000	69,928,000	61,418,000
Research and Development Expense	13,617,000	10,482,000	7,393,000
Impairment of intangible asset	0	1,125,000	0
Amortization of intangibles	15,552,000	8,105,000	5,024,000
Other Income & Expenses [Abstract]
Interest and debt expense	19,733,000	10,966,000	7,904,000
Gains (Losses) on Extinguishment of Debt	0	1,303,000	0
Investment (income) loss, net	(157,000)	(462,000)	(796,000)
Foreign currency exchange loss (gain), net	1,539,000	1,232,000	2,215,000
Other (income) expense, net	(701,000)	(93,000)	(377,000)
Current income tax expense (benefit):
Income tax expense	27,620,000	4,043,000	12,045,000
Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax & Other [Abstract]
Net income	$ 22,065,000	$ 8,984,000	$ 19,579,000
Weighted Average Number of Shares Outstanding Basic [Abstract]
Average basic shares outstanding	22,841	20,591	20,079
Weighted Average Number of Shares Outstanding Diluted [Abstract]
Average diluted shares outstanding	23,335	20,888	20,315
Basic income per share:
Basic income per share	$ 0.97	$ 0.44	$ 0.98
Diluted income per share:
Diluted income per share	0.95	0.43	0.96
Common Stock, Dividends, Per Share, Declared	$ 0.17	$ 0.16	$ 0.16