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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, 2018 | Apr. 30, 2017 | Apr. 30, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at net asset value | $ 156,463 | $ 123,920 |
Plan investment assets, at fair value | 156,463 | 137,141 | $ 106,965
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at net asset value | 156,463 | 123,920 |
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 | 448 | 295 |
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 | 448 | 295 |
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 | 37,421 | 78,335 |
Mutual Fund Equity [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at net asset value | 37,421 | 78,335 |
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 | 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 | 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 | 93,459 | 45,290 |
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 | 93,459 | 45,290 |
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 |
Capital Preservation Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan investment assets, at fair value |  | $ 13,221 |

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