Earnings Per Share - Weighted Average Shares Outstanding for Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings per share — Basic:
Net income	$ 4,824	$ 1,541	$ 20,566	$ 13,467
Weighted-average shares outstanding — Basic	64,637	63,706	64,308	63,287
Net income per common share — Basic	$ 0.07	$ 0.02	$ 0.32	$ 0.21
Earnings per share — Diluted:
Net income	$ 4,824	$ 1,541	$ 20,566	$ 13,467
Weighted-average shares outstanding — Basic	64,637	63,706	64,308	63,287
Effect of potentially dilutive securities	139	2	191	9
Weighted-average shares outstanding — Diluted	64,776	63,708	64,499	63,296
Net income per common share — Diluted	$ 0.07	$ 0.02	$ 0.32	$ 0.21