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Property, Plant, and Equipment (Details) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Other Depreciation and Amortization	$ 15,530,000	$ 16,184,000	$ 17,775,000
Land and land improvements	4,787,000	4,985,000
Buildings	39,941,000	39,930,000
Machinery, equipment, and leasehold improvements	229,161,000	228,140,000
Construction in progress	14,188,000	12,950,000
Property, plant, and equipment	288,077,000	286,005,000
Less accumulated depreciation	213,324,000	206,532,000
Net property, plant, and equipment	74,753,000	79,473,000
Capitalized Computer Software, Gross	38,925,000	37,864,000
Capital Computer Software Accumulated Amortization	27,207,000	22,962,000
Capitalized Computer Software Depreciation Expense	$ 3,639,000	$ 2,937,000	$ 3,045,000

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