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Stock-Based Compensation and Employee Stock Purchase Plan (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock-based employee compensation expense	$ 506,000	$ 329,000	$ 1,062,000	$ 595,000
Stock-Based Awards
Unamortized stock-based compensation expense related to unvested stock awards	7,700,000		7,700,000
Weighted average period of recognition for unrecognized compensation costs (in years)			3.36
Employee Stock Purchase Plan
Unamortized stock-based compensation expense related to unvested stock awards	199,000		199,000
Weighted average period of recognition for unrecognized compensation costs (in years)			0.5
Stock-based employee compensation expense	68,000	115,000	242,000	195,000
Annual maximum total purchases price amount per employee	$ 25,000		$ 25,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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