Differences Between Statutory and Effective Income Tax Rate (Detail)	1 Months Ended	12 Months Ended
Dec. 31, 2017	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Statutory income tax rate	35.00%	21.00%	21.00%	31.50%
Excess tax benefits from stock-based awards		(5.20%)	(24.10%)	(17.20%)
Foreign taxes			4.10%	2.20%
Permanent differences		5.00%	1.80%	2.40%
Credits		(10.80%)	(1.50%)	(4.90%)
State taxes, net		3.10%	0.10%	2.00%
Change in valuation allowance		5.30%	(0.40%)	0.50%
Effect of the Tax Reform Act on net deferred tax assets				13.00%
Rate differential on foreign operations		3.20%	0.20%
Other		(0.60%)	0.40%	0.60%
Effective tax rate		21.00%	1.60%	30.10%

Effective income tax rate reconciliation excess tax benefit share based compensation cost.

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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.

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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 changes in the valuation allowance for deferred tax assets.

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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 statutory income tax expense (benefit) outside of the country of domicile.

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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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