Stock-based Compenstaion Assumptions Used In Black-Scholes Model (Details) - $ / shares	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Option Grants and Stock Purchase Rights
Expected volatility	53.00%	58.00%	53.00%	58.00%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	1.59%	1.74%	1.59%	1.72%
Weighted average expected option term, in years	5 years 205 days	5 years 108 days	5 years 166 days	5 years 72 days
Weighted average fair value of options granted, per share	$ 4.00	$ 3.90	$ 4.06	$ 3.91
Employee Stock Purchase Plan Rights
Expected volatility	45.00%	46.00%	45.00%	46.00%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	0.30%	0.09%	0.30%	0.09%
Weighted average expected option term, in years	9 months	9 months	9 months	9 months
Weighted average fair value of options granted, per share	$ 2.78	$ 2.46	$ 2.78	$ 2.46