Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Weighted-average shares outstanding for basic and diluted net income per share
Net income (in dollars)	$ 8,315	$ 4,750	$ 14,677	$ 9,913
Basic net income per share:
Weighted-average shares outstanding - Basic	60,461	60,247	60,387	60,238
Basic net income per common share (in usd per share)	$ 0.14	$ 0.08	$ 0.24	$ 0.16
Diluted net income per share:
Weighted-average shares outstanding - Basic	60,461	60,247	60,387	60,238
Effect of potentially dilutive securities	733	541	742	544
Weighted-average shares outstanding - Diluted	61,194	60,788	61,129	60,782
Diluted net income per common share (in usd per share)	$ 0.14	$ 0.08	$ 0.24	$ 0.16