Income Tax (Details 1)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Current:
Federal income tax statutory rate	35.00%	35.00%	35.00%
Increase (decrease) resulting from:
State income taxes, net of Federal benefit	4.20%	4.00%	4.50%
Research and development tax credits	(5.30%)	(2.10%)	(0.90%)
Qualified production activities income deduction	(4.90%)	(4.60%)	(3.00%)
Impairment of goodwill	5.70%	7.50%	0.00%
Other	(2.90%)	(1.80%)	(0.60%)
Effective income tax rate	31.80%	38.00%	35.00%