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, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Earnings per share — Basic:
Net income	$ 1,541	$ 10,486	$ 13,467	$ 13,826
Weighted-average shares outstanding — Basic	63,706	62,093	63,287	61,645
Net income per common share — Basic	$ 0.02	$ 0.17	$ 0.21	$ 0.22
Earnings per share — Diluted:
Net income	$ 1,541	$ 10,486	$ 13,467	$ 13,826
Weighted-average shares outstanding — Basic	63,706	62,093	63,287	61,645
Effect of potentially dilutive securities	2		9	255
Weighted-average shares outstanding — Diluted	63,708	62,093	63,296	61,900
Net income per common share — Diluted	$ 0.02	$ 0.17	$ 0.21	$ 0.22