Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Costs and expenses:
Total share-based compensation	$ 541	$ 964
Software and hardware charges	(4,934)	(5,771)
Income tax benefit	(168)	(320)
Decrease in net income	(373)	(644)
Cost of revenue [Member]
Costs and expenses:
Total share-based compensation	74	76
Research and development costs [Member]
Costs and expenses:
Total share-based compensation	42	59
Selling, general and administrative [Member]
Costs and expenses:
Total share-based compensation	$ 425	$ 829