Earnings Per Share and Stock Plans (Schedule of Earnings Per Share) (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Numerator for basic and diluted earnings per share:
Net income	$ 59,672	$ 42,577	$ 22,065
Denominators:
Average basic shares outstanding	23,619	23,276	22,841
Effect of dilutive employee stock options, RSU's and performance shares	236	384	494
Average diluted shares outstanding	23,855	23,660	23,335