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Income Taxes (Schedule Of Reconciliation Between Income Tax Provision And Statutory Federal Tax Rate) (Details) | 12 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Income Tax Disclosure [Abstract] |  |  |
Document Fiscal Year Focus | 2018 |  |
U.S. statutory tax rate | 21.00% | 35.00% | 35.00%
State income taxes, net of federal income tax benefit | 2.20% | 1.60% | 2.20%
Earnings taxed in foreign jurisdictions | (4.90%) | (4.60%) | (2.00%)
Permanent differences | 0.40% | (0.40%) | (0.20%)
Uncertain tax positions | 3.60% | 4.30% | 2.80%
Effective Income Tax Rate Reconciliation, Remeasurment of deferred tax assets and liabilities | (2.60%) | (0.00%) | (0.00%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | (15.90%) | (0.00%) | (0.00%)
Effective Income Tax Rate Reconciliation, One-time transition tax | 2.90% | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Percent | (2.40%) | (0.00%) | (0.00%)
Effective Income Tax Rate Reconciliation, change in valuation allowance, domestic | 1.10% | (0.10%) | 0.00%
Effective Income Tax Rate Reconciliation, Change in valuation allowance, foreign | 2.90% | 0.30% | (0.50%)
Significant state apportionment changes | 0.00% | 0.00% | (4.30%)
Other | (2.00%) | (3.00%) | (0.30%)
Effective tax rate | 6.30% | 33.10% | 32.70%

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