Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Weighted-average shares outstanding for basic and diluted net income per share
Net income (in dollars)	$ 8,030,000	$ 3,987,000	$ 11,926,000	$ 3,340,000
Basic net income per share:
Weighted-average shares outstanding - Basic	63,513	61,658	63,077	61,420
Basic net income per common share (in usd per share)	$ 0.13	$ 0.06	$ 0.19	$ 0.05
Diluted net income per share:
Weighted-average shares outstanding - Basic	63,513	61,658	63,077	61,420
Effect of potentially dilutive securities	17	394	12	284
Weighted-average shares outstanding - Diluted	63,530	62,052	63,089	61,704
Diluted net income per common share (in usd per share)	$ 0.13	$ 0.06	$ 0.19	$ 0.05