Summary of Significant Accounting Policies (Details)	12 Months Ended
	Mar. 31, 2013
Revenue Recognition
Term of maintenance contract over which deferred maintenance revenue will be recognized	12 months
Trade accounts receivable
Period of past due balances which are reviewed individually for collectibility	60 days
Property, Furniture and Equipment | Minimum
Property, Furniture and Equipment
Estimated useful lives of the assets	2 years
Property, Furniture and Equipment | Maximum
Property, Furniture and Equipment
Estimated useful lives of the assets	5 years