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Employee Benefit and Retirement Plans (Schedule Of Pension Assets By Major Category Of Plan Assets And Type Of Fair Value Measurements) (Details) - USD ($) $ in Thousands | Apr. 30, 2019 | Apr. 30, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | $ 169,471 | $ 156,463
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 169,471 | 156,463
SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 469 | 448
Cash and Cash Equivalents [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 469 | 448
Cash and Cash Equivalents [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
Cash and Cash Equivalents [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
Mutual Fund Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 31,143 | 37,421
Mutual Fund Equity [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 31,143 | 37,421
Mutual Fund Equity [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
Mutual Fund Equity [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
International Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 20,553 | 25,135
International Equity [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 20,553 | 25,135
International Equity [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 |
International Equity [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value |  |
Mutual Fund Income Tax [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 117,306 | 93,459
Mutual Fund Income Tax [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 117,306 | 93,459
Mutual Fund Income Tax [Member] | SIGNIFICANT OBSERVABLE INPUTS (LEVEL 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | 0 | 0
Mutual Fund Income Tax [Member] | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at net asset value | $ 0 | $ 0

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