CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net income	$ 7,958	$ 5,885	$ 22,769	$ 16,000
Other comprehensive income (loss):
Net change in unrealized gain (loss) on investments	(16)	(8)	(15)	(28)
Tax provision (benefit) on other comprehensive income (loss)	(6)	(4)	(6)	(11)
Other comprehensive income (loss), net of tax	(10)	(4)	(9)	(17)
Comprehensive income	$ 7,948	$ 5,881	$ 22,760	$ 15,983