Income Taxes (Schedule Of Differences Between Statutory Tax Rate And Effective Tax Rate) (Details)	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Expense Reconciliation [Line Items]
Statutory federal tax expense (benefit) rate	31.50%	35.00%	35.00%
State taxes, net of federal benefit	0.80%	1.00%	0.50%
Differences between statutory rate and foreign effective tax rate	(19.10%)	(19.30%)	(22.10%)
Valuation allowance	0.00%	0.00%	(51.70%)
Effective Income Tax Rate Reconciliation US Tax Reform Act 2017	16.20%	0.00%	0.00%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	(3.00%)	0.00%	0.00%
Research and development credits	(1.40%)	(0.70%)	(0.60%)
Unremitted earnings of foreign subsidiaries		2.20%	4.90%
Non-deductible stock-based compensation	2.70%	2.30%	3.10%
Other	0.30%	(0.40%)	(0.90%)
Effective tax expense (benefit) rate	28.00%	20.10%	(31.80%)

Effective Income Tax Rate Reconciliation US Tax Reform Act 2017

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Effective Income Tax Rate Reconciliation, Unremitted Earnings of Foreign Subsidiaries, Percent

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Income Tax Expense 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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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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