Stock-based Compensation Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Stock-based Compensation Option Activity Details
Balance at beginning of period	4,462	4,793
Granted	229	310
Exercised	(329)	(318)
Cancelled/forfeited	(134)	(1)
Balance at end of period	4,228	4,784
Weighted-average exercise price of options granted during period	$ 5.28	$ 5.46
Total intrinsic value of options exercised during the period	$ 3,537	$ 3,551
Weighted Average Remaining recognition period in years	1 year 342 days	2 years 94 days