Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at Mar. 31, 2018	$ 323,410	$ 640	$ 244,462	$ 78,708	$ (400)
Balance, Shares at Mar. 31, 2018		63,995
Common stock issued under stock plans, net of shares withheld for taxes	(202)	$ 2	(204)
Common stock issued under stock plans, net of shares withheld for taxes, Shares		225
Stock-based compensation	3,116		3,116
Cumulative effect adjustment related to the adoption of ASC 606	8,419			8,419
Other comprehensive income:
Translation adjustments	(499)				(499)
Net income	2,648			2,648
Balance at Jun. 30, 2018	336,892	$ 642	247,374	89,775	(899)
Balance, Shares at Jun. 30, 2018		64,220
Balance at Mar. 31, 2019	375,946	$ 648	264,908	111,621	(1,231)
Balance, Shares at Mar. 31, 2019		64,838
Common stock issued under stock plans, net of shares withheld for taxes	(1,305)	$ 6	(1,311)
Common stock issued under stock plans, net of shares withheld for taxes, Shares		545
Stock-based compensation	4,891		4,891
Other comprehensive income:
Translation adjustments	54				54
Net income	1,244			1,244
Balance at Jun. 30, 2019	$ 380,830	$ 654	$ 268,488	$ 112,865	$ (1,177)
Balance, Shares at Jun. 30, 2019		65,383