Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Weighted-average shares outstanding for basic and diluted net income per share
Net income (in dollars)	$ 3,987,000	$ 8,315,000	$ 3,340,000	$ 14,677,000
Basic net income per share:
Weighted-average shares outstanding - Basic	61,658	60,461	61,420	60,387
Basic net income per common share (in usd per share)	$ 0.06	$ 0.14	$ 0.05	$ 0.24
Diluted net income per share:
Weighted-average shares outstanding - Basic	61,658	60,461	61,420	60,387
Effect of potentially dilutive securities	394	733	284	742
Weighted-average shares outstanding - Diluted	62,052	61,194	61,704	61,129
Diluted net income per common share (in usd per share)	$ 0.06	$ 0.14	$ 0.05	$ 0.24