Stockholder's Equity Assumptions Used In Black-Scholes Model (Details) - $ / shares	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Option Grants
Expected volatility	53.00%	61.00%	64.00%
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate, minimum	1.50%	1.40%	0.70%
Risk-free interest rate, maximum	1.80%	1.90%	2.20%
Weighted average expected option term, in years	5 years 144 days	6 years	6 years 36 days
Weighted average fair value of options granted, per share	$ 4.17	$ 4.14	$ 5.70
Employee Stock Purchase
Expected volatility	43.00%	49.00%	40.00%
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	0.39%	0.12%	0.09%
Weighted average expected option term, in years	299 days	288 days	270 days
Weighted average fair value of options granted, per share	$ 3.25	$ 2.52	$ 2.83