Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2012
Costs and expenses:
Total share-based compensation	$ 583	$ 804	$ 1,966		$ 2,465
Software and hardware charges	(4,660)	(4,622)	(16,055)	(13,423)
Income tax benefit	(174)	(298)	(621)		(916)
Decrease in net income	(409)	(506)	(1,345)		(1,549)
Cost of revenue [Member]
Costs and expenses:
Total share-based compensation	51	71
Software and hardware charges			(200)		(190)
Research and development costs [Member]
Costs and expenses:
Total share-based compensation	76	56
Software and hardware charges			(209)		(133)
Selling, general and administrative [Member]
Costs and expenses:
Total share-based compensation	456	677
Software and hardware charges			$ (1,557)		$ (2,142)