Basis of Presentation (Schedule Of Option Activity) (Details) (USD $)	6 Months Ended
	Sep. 30, 2013
Basis Of Presentation Schedule Of Option Activity Details
Balance at March 31, 2013	5,991,544
Granted - options	1,125,400
Exercised	(673,362)
Cancelled/forfeited	(13,067)
Termination of plans	0
Balance at September 30, 2013	6,430,515
Shares available for grant at March 31, 2013	3,175,261
Change in options available for grant	1,000,000
Granted options, shares available for grant	(1,125,400)
Stock purchase rights/restricted stock unit (1)	(1,049,292)	[1]
Restricted Stock Units	0
Exercised	0
Cancelled/forfeited shares available for grant	13,067
Cancelled/forfeited - Restricted Stock Units	0
Termination of plans shares available for grant	(1,774)
Shares available for grant, at September 30, 2013	2,011,862
Weighted-average exercise price of options outstanding, at March 31, 2013	$ 2.52
Weighted-average exercise price of options granted during period	$ 9.49
Weighted-average exercise price of stock purchases rights during period	$ 0
Weighted-average exercise price of options exercised during the period	$ 2.20
Weighted-average exercise price of options forfeited, cancelled or expired during the period	$ 4.07
Weighted-average exercise price of options termination of plans during period	$ 0
Weighted-average exercise price of options outstanding at September 30, 2013	$ 3.77

[1] The reduction to shares available for grant includes awards granted of 1,049,292 shares