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Employee Benefit and Retirement Plans (Schedule Of Allocation Of Plan Assets) (Details) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset target allocation | 100.00% |
Plan asset actual allocation | 100.00% | 100.00%
Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset target allocation | 57.00% |
Plan asset actual allocation | 57.00% | 57.00%
Fixed Income Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan asset target allocation | 43.00% |
Plan asset actual allocation | 43.00% | 43.00%

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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