Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax	$ 809,162,000	$ 876,282,000	$ 839,419,000
Cost of Goods and Services Sold	525,976,000	571,285,000	554,358,000
Income from operations	89,824,000	69,442,000	68,331,000
Income from continuing operations before income tax expense	77,156,000	52,898,000	49,685,000
Revenues [Abstract]
Gross profit	283,186,000	304,997,000	285,061,000
Operating Expenses [Abstract]
Selling expenses	91,054,000	97,925,000	101,956,000
General and administrative expenses	77,880,000	83,567,000	85,605,000
Research and Development Expense	11,310,000	13,491,000	13,617,000
Gain (Loss) on Disposition of Business	176,000	25,672,000	0
Amortization of intangibles	12,942,000	14,900,000	15,552,000
Other Income & Expenses [Abstract]
Interest and debt expense	14,234,000	17,144,000	19,733,000
Investment (income) loss, net	(891,000)	(727,000)	(157,000)
Foreign currency exchange loss (gain), net	(1,514,000)	843,000	1,539,000
Other (income) expense, net	839,000	(716,000)	(2,469,000)
Current income tax expense (benefit):
Income tax expense	17,484,000	10,321,000	27,620,000
Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax & Other [Abstract]
Net income	$ 59,672,000	$ 42,577,000	$ 22,065,000
Weighted Average Number of Shares Outstanding Basic [Abstract]
Average basic shares outstanding	23,619	23,276	22,841
Weighted Average Number of Shares Outstanding Diluted [Abstract]
Average diluted shares outstanding	23,855	23,660	23,335
Basic income per share:
Basic income per share	$ 2.53	$ 1.83	$ 0.97
Diluted income per share:
Diluted income per share	2.50	1.80	0.95
Common Stock, Dividends, Per Share, Declared	$ 0.24	$ 0.21	$ 0.17