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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, 2017 | Apr. 30, 2016 | Apr. 30, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at net asset value | $ 123,920 | $ 89,029 |
Plan investment assets, at fair value | 137,141 | 106,965 | $ 108,661
QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at net asset value | 123,920 | 89,029 |
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 | 295 | 10 |
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 | 295 | 10 |
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 | 78,335 | 61,338 |
Mutual Fund Equity [Member] | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at net asset value | 78,335 | 61,338 |
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 |
Mutual Fund Income Tax [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at net asset value | 45,290 | 27,681 |
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 | 45,290 | 27,681 |
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 | $ 17,936 |

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