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Earnings Per Share and Stock Plans (Schedule of Earnings Per Share) (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Numerator for basic and diluted earnings per share:
Net income	$ 9,106	$ 59,672	$ 42,577
Denominators:
Average basic shares outstanding	23,897	23,619	23,276
Effect of dilutive employee stock options, RSU's and performance shares	276	236	384
Average diluted shares outstanding	24,173	23,855	23,660

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