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Income Taxes - Reconciliation of Statutory Tax Rates and Effective Tax Rates (Detail)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax expense (benefit) rate	(21.00%)	(21.00%)	(21.00%)
State and local income tax expense, net of federal income tax effect	0.90%	(4.90%)	(1.00%)
Foreign earnings taxed at different rates	10.00%	12.30%	(25.50%)
U.S. tax on Global Intangible Low-Taxed Income	1.80%	14.50%	(72.90%)
Domestic permanent differences including acquisition items	1.70%	7.70%	(7.80%)
Foreign tax credits	(7.80%)	(19.30%)	22.40%
Research credits	(68.60%)	(32.90%)	51.80%
Tax reserves	(0.10%)	(0.60%)	5.20%
Valuation allowance	74.40%	64.00%	76.70%
Enacted tax law changes	0.00%	10.60%	7.80%
Stock-based compensation	36.30%	(43.10%)	(97.20%)
CARES Act Impact	15.00%	(82.10%)	0.00%
Reduction of NOL for carryback	0.00%	59.20%	0.00%
Other differences, net	3.20%	(19.40%)	(4.30%)
Effective income tax expense (benefit)	45.80%	(55.00%)	(65.80%)

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Effective Income Tax Rate Reconciliation, CARES Act Impact, Percent

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Effective Income Tax Rate Reconciliation, Global Intangible Low-Taxed Income Tax

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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 foreign tax credit.

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