Income Tax (Details 1)	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Current:
Federal income tax statutory rate	35.00%	35.00%	35.00%
Increase (decrease) resulting from:
State income taxes, net of Federal benefit	2.00%	4.20%	4.00%
Research and development tax credits	(4.40%)	(5.30%)	(2.10%)
Qualified production activities income deduction	(5.40%)	(4.90%)	(4.60%)
Impairment of goodwill	0.00%	5.70%	7.50%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	(1.80%)	0.00%	0.00%
Other	(2.00%)	(2.90%)	(1.80%)
Effective income tax rate	23.40%	31.80%	38.00%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Percentage of the difference, between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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