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Income Taxes (Schedule Of Differences Between Statutory Tax Rate And Effective Tax Rate) (Details) | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Expense Reconciliation [Line Items] |  |  |
Statutory federal tax expense (benefit) rate | 21.00% | 21.00% | 31.50%
State taxes, net of federal benefit | 1.00% | 0.70% | 0.80%
Differences between statutory rate and foreign effective tax rate | (8.40%) | (14.40%) | (19.10%)
Effective Income Tax Rate Reconciliation US Tax Reform Act 2017 | 0.00% | (0.40%) | 16.20%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent | (0.10%) | (1.90%) | (3.00%)
Research and development credits | (1.20%) | (2.40%) | (1.40%)
Unremitted earnings of foreign subsidiaries | (122.10%) |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent | 5.40% | 0.00% | 0.00%
Non-deductible stock-based compensation | 2.30% | 2.30% | 2.70%
Other | 0.60% | 0.70% | 0.30%
Effective tax expense (benefit) rate | (101.50%) | 5.60% | 28.00%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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