Differences Between Statutory Income Tax Rate and Effective Tax Rates (Detail)	3 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Statutory income tax rate	35.00%	35.00%
Excess tax benefits from stock-based awards	(49.80%)
Credits	(1.20%)	(1.30%)
State taxes, net	3.50%	3.40%
Permanent differences	1.80%	2.70%
Other	0.10%	(0.10%)
Effective tax rate	(10.60%)	39.70%

Effective income tax rate reconciliation, permanent differences.

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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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 equity-based compensation costs.

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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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