Differences Between Statutory Income Tax Rate and Effective Tax Rates (Detail)	3 Months Ended	6 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Effective Tax Rate Reconciliation [Line Items]
Statutory income tax rate	35.00%	34.00%	35.00%	34.00%
Losses not benefited		(26.00%)		(15.70%)
Credits	(1.20%)		(1.40%)
State taxes, net	3.30%		3.30%
Permanent differences	3.00%		3.50%
Other	0.20%		0.60%	2.60%
Effective tax rate	40.30%	8.00%	41.00%	20.90%

Effective Income Tax Rate Reconciliation Foreign Losses Not Benefited

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Effective Income Tax Rate Reconciliation, Permanent Differences

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Schedule of Effective Tax Rate Reconciliation [Line Items]

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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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-Publisher FASB

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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 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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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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