Income Taxes - Reconciliation of Statutory Tax Rate of Parent Company to Effective Consolidated Tax Rate (Detail)	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Statutory tax rate (in Israel)	25.00%	26.50%	26.50%
(Decrease) increase in effective tax rate due to:
Tax benefits from reduced tax rates under benefit programs	(5.20%)	(6.00%)	(7.00%)
Utilization of net operating losses	(0.00%)	(5.00%)	(0.00%)
Different tax rates applicable to non-Israeli subsidiaries	(1.50%)	(2.50%)	(4.00%)
Uncertain tax positions, net	0.70%	1.50%	1.00%
Taxes from prior years	(0.50%)	0.50%	0.00%
Effective consolidated tax rate	18.50%	15.00%	16.50%

Effective Income Tax Rate Reconciliation Investment In Foreign Subsidiaries

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Effective income tax rate reconciliation utilization of net operating losses.

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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 deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.

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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 income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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