Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Costs and expenses:
Total share-based compensation	$ 3,321	$ 3,748	$ 2,073
Amounts capitalized in software development costs		(2)	(27)
Amounts charged against earnings, before income tax benefit	3,321	3,746	2,046
Related income tax benefit	(1,236)	(1,343)	(608)
Decrease in net income	(2,085)	(2,403)	(1,438)
Cost of revenue [Member]
Costs and expenses:
Total share-based compensation	261	272	85
Research and development costs [Member]
Costs and expenses:
Total share-based compensation	184	152	108
Selling, general and administrative [Member]
Costs and expenses:
Total share-based compensation	$ 2,876	$ 3,324	$ 1,880