Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Costs and expenses:
Total share-based compensation	$ 901	$ 867	$ 1,585	$ 1,657
Income tax benefit	(276)	(249)	(476)	(512)
Cost of revenue [Member]
Costs and expenses:
Total share-based compensation	102	92	199	178
Research and development costs [Member]
Costs and expenses:
Total share-based compensation	103	97	213	180
Selling, general and administrative [Member]
Costs and expenses:
Total share-based compensation	$ 696	$ 678	$ 1,173	$ 1,299